1 # -*- coding: utf-8 -*-
2 ##############################################################################
4 # OpenERP, Open Source Management Solution
5 # Copyright (C) 2013-2014 OpenERP (<http://www.openerp.com>).
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as
9 # published by the Free Software Foundation, either version 3 of the
10 # License, or (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
20 ##############################################################################
22 """ High-level objects for fields. """
25 from datetime import date, datetime
26 from functools import partial
27 from operator import attrgetter
28 from types import NoneType
33 from types import NoneType
35 from openerp.tools import float_round, ustr, html_sanitize
36 from openerp.tools import DEFAULT_SERVER_DATE_FORMAT as DATE_FORMAT
37 from openerp.tools import DEFAULT_SERVER_DATETIME_FORMAT as DATETIME_FORMAT
39 DATE_LENGTH = len(date.today().strftime(DATE_FORMAT))
40 DATETIME_LENGTH = len(datetime.now().strftime(DATETIME_FORMAT))
42 _logger = logging.getLogger(__name__)
44 class SpecialValue(object):
45 """ Encapsulates a value in the cache in place of a normal value. """
46 def __init__(self, value):
51 class FailedValue(SpecialValue):
52 """ Special value that encapsulates an exception instead of a value. """
53 def __init__(self, exception):
54 self.exception = exception
58 def _check_value(value):
59 """ Return `value`, or call its getter if `value` is a :class:`SpecialValue`. """
60 return value.get() if isinstance(value, SpecialValue) else value
63 def resolve_all_mro(cls, name, reverse=False):
64 """ Return the (successively overridden) values of attribute `name` in `cls`
65 in mro order, or inverse mro order if `reverse` is true.
67 klasses = reversed(cls.__mro__) if reverse else cls.__mro__
69 if name in klass.__dict__:
70 yield klass.__dict__[name]
73 class MetaField(type):
74 """ Metaclass for field classes. """
77 def __init__(cls, name, bases, attrs):
78 super(MetaField, cls).__init__(name, bases, attrs)
80 cls.by_type[cls.type] = cls
82 # compute class attributes to avoid calling dir() on fields
84 cls.related_attrs = []
85 cls.description_attrs = []
87 if attr.startswith('_column_'):
88 cls.column_attrs.append((attr[8:], attr))
89 elif attr.startswith('_related_'):
90 cls.related_attrs.append((attr[9:], attr))
91 elif attr.startswith('_description_'):
92 cls.description_attrs.append((attr[13:], attr))
96 """ The field descriptor contains the field definition, and manages accesses
97 and assignments of the corresponding field on records. The following
98 attributes may be provided when instanciating a field:
100 :param string: the label of the field seen by users (string); if not
101 set, the ORM takes the field name in the class (capitalized).
103 :param help: the tooltip of the field seen by users (string)
105 :param readonly: whether the field is readonly (boolean, by default ``False``)
107 :param required: whether the value of the field is required (boolean, by
110 :param index: whether the field is indexed in database (boolean, by
113 :param default: the default value for the field; this is either a static
114 value, or a function taking a recordset and returning a value
116 :param states: a dictionary mapping state values to lists of UI attribute-value
117 pairs; possible attributes are: 'readonly', 'required', 'invisible'.
118 Note: Any state-based condition requires the ``state`` field value to be
119 available on the client-side UI. This is typically done by including it in
120 the relevant views, possibly made invisible if not relevant for the
123 :param groups: comma-separated list of group xml ids (string); this
124 restricts the field access to the users of the given groups only
126 :param bool copy: whether the field value should be copied when the record
127 is duplicated (default: ``True`` for normal fields, ``False`` for
128 ``one2many`` and computed fields, including property fields and
133 .. rubric:: Computed fields
135 One can define a field whose value is computed instead of simply being
136 read from the database. The attributes that are specific to computed
137 fields are given below. To define such a field, simply provide a value
138 for the attribute `compute`.
140 :param compute: name of a method that computes the field
142 :param inverse: name of a method that inverses the field (optional)
144 :param search: name of a method that implement search on the field (optional)
146 :param store: whether the field is stored in database (boolean, by
147 default ``False`` on computed fields)
149 The methods given for `compute`, `inverse` and `search` are model
150 methods. Their signature is shown in the following example::
152 upper = fields.Char(compute='_compute_upper',
153 inverse='_inverse_upper',
154 search='_search_upper')
157 def _compute_upper(self):
159 self.upper = self.name.upper() if self.name else False
161 def _inverse_upper(self):
163 self.name = self.upper.lower() if self.upper else False
165 def _search_upper(self, operator, value):
166 if operator == 'like':
168 return [('name', operator, value)]
170 The compute method has to assign the field on all records of the invoked
171 recordset. The decorator :meth:`openerp.api.depends` must be applied on
172 the compute method to specify the field dependencies; those dependencies
173 are used to determine when to recompute the field; recomputation is
174 automatic and guarantees cache/database consistency. Note that the same
175 method can be used for several fields, you simply have to assign all the
176 given fields in the method; the method will be invoked once for all
179 By default, a computed field is not stored to the database, and is
180 computed on-the-fly. Adding the attribute ``store=True`` will store the
181 field's values in the database. The advantage of a stored field is that
182 searching on that field is done by the database itself. The disadvantage
183 is that it requires database updates when the field must be recomputed.
185 The inverse method, as its name says, does the inverse of the compute
186 method: the invoked records have a value for the field, and you must
187 apply the necessary changes on the field dependencies such that the
188 computation gives the expected value. Note that a computed field without
189 an inverse method is readonly by default.
191 The search method is invoked when processing domains before doing an
192 actual search on the model. It must return a domain equivalent to the
193 condition: `field operator value`.
197 .. rubric:: Related fields
199 The value of a related field is given by following a sequence of
200 relational fields and reading a field on the reached model. The complete
201 sequence of fields to traverse is specified by the attribute
203 :param related: sequence of field names
205 The value of some attributes from related fields are automatically taken
206 from the source field, when it makes sense. Examples are the attributes
207 `string` or `selection` on selection fields.
209 By default, the values of related fields are not stored to the database.
210 Add the attribute ``store=True`` to make it stored, just like computed
211 fields. Related fields are automatically recomputed when their
212 dependencies are modified.
214 .. _field-company-dependent:
216 .. rubric:: Company-dependent fields
218 Formerly known as 'property' fields, the value of those fields depends
219 on the company. In other words, users that belong to different companies
220 may see different values for the field on a given record.
222 :param company_dependent: whether the field is company-dependent (boolean)
224 .. _field-incremental-definition:
226 .. rubric:: Incremental definition
228 A field is defined as class attribute on a model class. If the model
229 is extended (see :class:`~openerp.models.Model`), one can also extend
230 the field definition by redefining a field with the same name and same
231 type on the subclass. In that case, the attributes of the field are
232 taken from the parent class and overridden by the ones given in
235 For instance, the second class below only adds a tooltip on the field
238 class First(models.Model):
240 state = fields.Selection([...], required=True)
242 class Second(models.Model):
244 state = fields.Selection(help="Blah blah blah")
247 __metaclass__ = MetaField
249 _attrs = None # dictionary with all field attributes
250 _free_attrs = None # list of semantic-free attribute names
252 automatic = False # whether the field is automatically created ("magic" field)
253 inherited = False # whether the field is inherited (_inherits)
254 column = None # the column interfaced by the field
255 setup_done = False # whether the field has been set up
257 name = None # name of the field
258 type = None # type of the field (string)
259 relational = False # whether the field is a relational one
260 model_name = None # name of the model of this field
261 comodel_name = None # name of the model of values (if relational)
262 inverse_fields = None # list of inverse fields (objects)
264 store = True # whether the field is stored in database
265 index = False # whether the field is indexed in database
266 manual = False # whether the field is a custom field
267 copy = True # whether the field is copied over by BaseModel.copy()
268 depends = () # collection of field dependencies
269 recursive = False # whether self depends on itself
270 compute = None # compute(recs) computes field on recs
271 inverse = None # inverse(recs) inverses field on recs
272 search = None # search(recs, operator, value) searches on self
273 related = None # sequence of field names, for related fields
274 related_sudo = True # whether related fields should be read as admin
275 company_dependent = False # whether `self` is company-dependent (property field)
276 default = None # default(recs) returns the default value
278 string = None # field label
279 help = None # field tooltip
283 groups = False # csv list of group xml ids
284 change_default = None # whether the field may trigger a "user-onchange"
285 deprecated = None # whether the field is ... deprecated
287 def __init__(self, string=None, **kwargs):
288 kwargs['string'] = string
289 self._attrs = {key: val for key, val in kwargs.iteritems() if val is not None}
290 self._free_attrs = []
292 def new(self, **kwargs):
293 """ Return a field of the same type as `self`, with its own parameters. """
294 return type(self)(**kwargs)
296 def set_class_name(self, cls, name):
297 """ Assign the model class and field name of `self`. """
298 self.model_name = cls._name
301 # determine all inherited field attributes
303 for field in resolve_all_mro(cls, name, reverse=True):
304 if isinstance(field, type(self)):
305 attrs.update(field._attrs)
308 attrs.update(self._attrs) # necessary in case self is not in cls
310 # initialize `self` with `attrs`
311 if attrs.get('compute'):
312 # by default, computed fields are not stored, not copied and readonly
313 attrs['store'] = attrs.get('store', False)
314 attrs['copy'] = attrs.get('copy', False)
315 attrs['readonly'] = attrs.get('readonly', not attrs.get('inverse'))
316 if attrs.get('related'):
317 # by default, related fields are not stored
318 attrs['store'] = attrs.get('store', False)
320 for attr, value in attrs.iteritems():
321 if not hasattr(self, attr):
322 self._free_attrs.append(attr)
323 setattr(self, attr, value)
326 self.string = name.replace('_', ' ').capitalize()
328 # determine self.default and cls._defaults in a consistent way
329 self._determine_default(cls, name)
333 def _determine_default(self, cls, name):
334 """ Retrieve the default value for `self` in the hierarchy of `cls`, and
335 determine `self.default` and `cls._defaults` accordingly.
339 # traverse the class hierarchy upwards, and take the first field
340 # definition with a default or _defaults for self
341 for klass in cls.__mro__:
342 field = klass.__dict__.get(name, self)
343 if not isinstance(field, type(self)):
344 return # klass contains another value overridden by self
346 if 'default' in field._attrs:
347 # take the default in field, and adapt it for cls._defaults
348 value = field._attrs['default']
351 cls._defaults[name] = lambda model, cr, uid, context: \
352 self.convert_to_write(value(model.browse(cr, uid, [], context)))
354 self.default = lambda recs: value
355 cls._defaults[name] = value
358 defaults = klass.__dict__.get('_defaults') or {}
360 # take the value from _defaults, and adapt it for self.default
361 value = defaults[name]
362 value_func = value if callable(value) else lambda *args: value
363 self.default = lambda recs: self.convert_to_cache(
364 value_func(recs._model, recs._cr, recs._uid, recs._context),
365 recs, validate=False,
367 cls._defaults[name] = value
371 return "%s.%s" % (self.model_name, self.name)
374 return "%s.%s" % (self.model_name, self.name)
376 ############################################################################
382 """ Prepare `self` for a new setup. """
383 self.setup_done = False
384 # self._triggers is a set of pairs (field, path) that represents the
385 # computed fields that depend on `self`. When `self` is modified, it
386 # invalidates the cache of each `field`, and registers the records to
387 # recompute based on `path`. See method `modified` below for details.
388 self._triggers = set()
389 self.inverse_fields = []
391 def setup(self, env):
392 """ Complete the setup of `self` (dependencies, recomputation triggers,
393 and other properties). This method is idempotent: it has no effect
394 if `self` has already been set up.
396 if not self.setup_done:
398 self.setup_done = True
400 def _setup(self, env):
401 """ Do the actual setup of `self`. """
403 self._setup_related(env)
405 self._setup_regular(env)
407 # put invalidation/recomputation triggers on field dependencies
408 model = env[self.model_name]
409 for path in self.depends:
410 self._setup_dependency([], model, path.split('.'))
412 # put invalidation triggers on model dependencies
413 for dep_model_name, field_names in model._depends.iteritems():
414 dep_model = env[dep_model_name]
415 for field_name in field_names:
416 field = dep_model._fields[field_name]
417 field._triggers.add((self, None))
420 # Setup of related fields
423 def _setup_related(self, env):
424 """ Setup the attributes of a related field. """
425 # fix the type of self.related if necessary
426 if isinstance(self.related, basestring):
427 self.related = tuple(self.related.split('.'))
429 # determine the chain of fields, and make sure they are all set up
430 recs = env[self.model_name]
431 for name in self.related:
432 field = recs._fields[name]
436 self.related_field = field
438 # check type consistency
439 if self.type != field.type:
440 raise Warning("Type of related field %s is inconsistent with %s" % (self, field))
442 # determine dependencies, compute, inverse, and search
443 self.depends = ('.'.join(self.related),)
444 self.compute = self._compute_related
445 self.inverse = self._inverse_related
446 if field._description_searchable(env):
447 # allow searching on self only if the related field is searchable
448 self.search = self._search_related
450 # copy attributes from field to self (string, help, etc.)
451 for attr, prop in self.related_attrs:
452 if not getattr(self, attr):
453 setattr(self, attr, getattr(field, prop))
455 def _compute_related(self, records):
456 """ Compute the related field `self` on `records`. """
457 # when related_sudo, bypass access rights checks when reading values
458 others = records.sudo() if self.related_sudo else records
459 for record, other in zip(records, others):
461 # draft record, do not switch to another environment
463 # traverse the intermediate fields; follow the first record at each step
464 for name in self.related[:-1]:
465 other = other[name][:1]
466 record[self.name] = other[self.related[-1]]
468 def _inverse_related(self, records):
469 """ Inverse the related field `self` on `records`. """
470 for record in records:
472 # traverse the intermediate fields, and keep at most one record
473 for name in self.related[:-1]:
474 other = other[name][:1]
476 other[self.related[-1]] = record[self.name]
478 def _search_related(self, records, operator, value):
479 """ Determine the domain to search on field `self`. """
480 return [('.'.join(self.related), operator, value)]
482 # properties used by _setup_related() to copy values from related field
483 _related_comodel_name = property(attrgetter('comodel_name'))
484 _related_string = property(attrgetter('string'))
485 _related_help = property(attrgetter('help'))
486 _related_readonly = property(attrgetter('readonly'))
487 _related_groups = property(attrgetter('groups'))
490 # Setup of non-related fields
493 def _setup_regular(self, env):
494 """ Setup the attributes of a non-related field. """
495 recs = env[self.model_name]
497 def make_depends(deps):
498 return tuple(deps(recs) if callable(deps) else deps)
500 # convert compute into a callable and determine depends
501 if isinstance(self.compute, basestring):
502 # if the compute method has been overridden, concatenate all their _depends
504 for method in resolve_all_mro(type(recs), self.compute, reverse=True):
505 self.depends += make_depends(getattr(method, '_depends', ()))
506 self.compute = getattr(type(recs), self.compute)
508 self.depends = make_depends(getattr(self.compute, '_depends', ()))
510 # convert inverse and search into callables
511 if isinstance(self.inverse, basestring):
512 self.inverse = getattr(type(recs), self.inverse)
513 if isinstance(self.search, basestring):
514 self.search = getattr(type(recs), self.search)
516 def _setup_dependency(self, path0, model, path1):
517 """ Make `self` depend on `model`; `path0 + path1` is a dependency of
518 `self`, and `path0` is the sequence of field names from `self.model`
522 head, tail = path1[0], path1[1:]
525 # special case: add triggers on all fields of model (except self)
526 fields = set(model._fields.itervalues()) - set([self])
528 fields = [model._fields[head]]
532 _logger.debug("Field %s is recursively defined", self)
533 self.recursive = True
538 #_logger.debug("Add trigger on %s to recompute %s", field, self)
539 field._triggers.add((self, '.'.join(path0 or ['id'])))
541 # add trigger on inverse fields, too
542 for invf in field.inverse_fields:
543 #_logger.debug("Add trigger on %s to recompute %s", invf, self)
544 invf._triggers.add((self, '.'.join(path0 + [head])))
546 # recursively traverse the dependency
548 comodel = env[field.comodel_name]
549 self._setup_dependency(path0 + [head], comodel, tail)
552 def dependents(self):
553 """ Return the computed fields that depend on `self`. """
554 return (field for field, path in self._triggers)
556 ############################################################################
561 def get_description(self, env):
562 """ Return a dictionary that describes the field `self`. """
563 desc = {'type': self.type}
564 for attr, prop in self.description_attrs:
565 value = getattr(self, prop)
568 if value is not None:
573 # properties used by get_description()
575 def _description_store(self, env):
577 # if the corresponding column is a function field, check the column
578 column = env[self.model_name]._columns.get(self.name)
579 return bool(getattr(column, 'store', True))
582 def _description_searchable(self, env):
584 column = env[self.model_name]._columns.get(self.name)
585 return bool(getattr(column, 'store', True)) or \
586 bool(getattr(column, '_fnct_search', False))
587 return bool(self.search)
589 def _description_sortable(self, env):
591 column = env[self.model_name]._columns.get(self.name)
592 return bool(getattr(column, 'store', True))
594 # self is sortable if the inherited field is itself sortable
595 return self.related_field._description_sortable(env)
598 _description_manual = property(attrgetter('manual'))
599 _description_depends = property(attrgetter('depends'))
600 _description_related = property(attrgetter('related'))
601 _description_company_dependent = property(attrgetter('company_dependent'))
602 _description_readonly = property(attrgetter('readonly'))
603 _description_required = property(attrgetter('required'))
604 _description_states = property(attrgetter('states'))
605 _description_groups = property(attrgetter('groups'))
606 _description_change_default = property(attrgetter('change_default'))
607 _description_deprecated = property(attrgetter('deprecated'))
609 def _description_string(self, env):
610 if self.string and env.lang:
611 name = "%s,%s" % (self.model_name, self.name)
612 trans = env['ir.translation']._get_source(name, 'field', env.lang)
613 return trans or self.string
616 def _description_help(self, env):
617 if self.help and env.lang:
618 name = "%s,%s" % (self.model_name, self.name)
619 trans = env['ir.translation']._get_source(name, 'help', env.lang)
620 return trans or self.help
623 ############################################################################
625 # Conversion to column instance
629 """ return a low-level field object corresponding to `self` """
632 # determine column parameters
633 _logger.debug("Create fields._column for Field %s", self)
635 for attr, prop in self.column_attrs:
636 args[attr] = getattr(self, prop)
637 for attr in self._free_attrs:
638 args[attr] = getattr(self, attr)
640 if self.company_dependent:
641 # company-dependent fields are mapped to former property fields
642 args['type'] = self.type
643 args['relation'] = self.comodel_name
644 return fields.property(**args)
647 # let the column provide a valid column for the given parameters
648 return self.column.new(**args)
650 return getattr(fields, self.type)(**args)
652 # properties used by to_column() to create a column instance
653 _column_copy = property(attrgetter('copy'))
654 _column_select = property(attrgetter('index'))
655 _column_manual = property(attrgetter('manual'))
656 _column_string = property(attrgetter('string'))
657 _column_help = property(attrgetter('help'))
658 _column_readonly = property(attrgetter('readonly'))
659 _column_required = property(attrgetter('required'))
660 _column_states = property(attrgetter('states'))
661 _column_groups = property(attrgetter('groups'))
662 _column_change_default = property(attrgetter('change_default'))
663 _column_deprecated = property(attrgetter('deprecated'))
665 ############################################################################
667 # Conversion of values
671 """ return the null value for this field in the given environment """
674 def convert_to_cache(self, value, record, validate=True):
675 """ convert `value` to the cache level in `env`; `value` may come from
676 an assignment, or have the format of methods :meth:`BaseModel.read`
677 or :meth:`BaseModel.write`
679 :param record: the target record for the assignment, or an empty recordset
681 :param bool validate: when True, field-specific validation of
682 `value` will be performed
686 def convert_to_read(self, value, use_name_get=True):
687 """ convert `value` from the cache to a value as returned by method
688 :meth:`BaseModel.read`
690 :param bool use_name_get: when True, value's diplay name will
691 be computed using :meth:`BaseModel.name_get`, if relevant
694 return False if value is None else value
696 def convert_to_write(self, value, target=None, fnames=None):
697 """ convert `value` from the cache to a valid value for method
698 :meth:`BaseModel.write`.
700 :param target: optional, the record to be modified with this value
701 :param fnames: for relational fields only, an optional collection of
702 field names to convert
704 return self.convert_to_read(value)
706 def convert_to_onchange(self, value):
707 """ convert `value` from the cache to a valid value for an onchange
710 return self.convert_to_write(value)
712 def convert_to_export(self, value, env):
713 """ convert `value` from the cache to a valid value for export. The
714 parameter `env` is given for managing translations.
716 if env.context.get('export_raw_data'):
718 return bool(value) and ustr(value)
720 def convert_to_display_name(self, value):
721 """ convert `value` from the cache to a suitable display name. """
724 ############################################################################
729 def __get__(self, record, owner):
730 """ return the value of field `self` on `record` """
732 return self # the field is accessed through the owner class
735 # null record -> return the null value for this field
736 return self.null(record.env)
738 # only a single record may be accessed
742 return record._cache[self]
746 # cache miss, retrieve value
748 # normal record -> read or compute value for this field
749 self.determine_value(record)
751 # draft record -> compute the value or let it be null
752 self.determine_draft_value(record)
754 # the result should be in cache now
755 return record._cache[self]
757 def __set__(self, record, value):
758 """ set the value of field `self` on `record` """
761 # only a single record may be updated
764 # adapt value to the cache level
765 value = self.convert_to_cache(value, record)
767 if env.in_draft or not record.id:
768 # determine dependent fields
769 spec = self.modified_draft(record)
771 # set value in cache, inverse field, and mark record as dirty
772 record._cache[self] = value
774 for invf in self.inverse_fields:
775 invf._update(value, record)
778 # determine more dependent fields, and invalidate them
780 spec += self.modified_draft(record)
784 # simply write to the database, and update cache
785 record.write({self.name: self.convert_to_write(value)})
786 record._cache[self] = value
788 ############################################################################
790 # Computation of field values
793 def _compute_value(self, records):
794 """ Invoke the compute method on `records`. """
795 # initialize the fields to their corresponding null value in cache
796 for field in self.computed_fields:
797 records._cache[field] = field.null(records.env)
798 records.env.computed[field].update(records._ids)
799 self.compute(records)
800 for field in self.computed_fields:
801 records.env.computed[field].difference_update(records._ids)
803 def compute_value(self, records):
804 """ Invoke the compute method on `records`; the results are in cache. """
805 with records.env.do_in_draft():
807 self._compute_value(records)
808 except (AccessError, MissingError):
809 # some record is forbidden or missing, retry record by record
810 for record in records:
812 self._compute_value(record)
813 except Exception as exc:
814 record._cache[self.name] = FailedValue(exc)
816 def determine_value(self, record):
817 """ Determine the value of `self` for `record`. """
820 if self.store and not (self.depends and env.in_draft):
821 # this is a stored field
823 # this is a stored computed field, check for recomputation
824 recs = record._recompute_check(self)
826 # recompute the value (only in cache)
827 self.compute_value(recs)
828 # HACK: if result is in the wrong cache, copy values
830 for source, target in zip(recs, recs.with_env(env)):
832 values = target._convert_to_cache({
833 f.name: source[f.name] for f in self.computed_fields
835 except MissingError as e:
836 values = FailedValue(e)
837 target._cache.update(values)
838 # the result is saved to database by BaseModel.recompute()
841 # read the field from database
842 record._prefetch_field(self)
845 # this is either a non-stored computed field, or a stored computed
846 # field in draft mode
848 self.compute_value(record)
850 recs = record._in_cache_without(self)
851 self.compute_value(recs)
854 # this is a non-stored non-computed field
855 record._cache[self] = self.null(env)
857 def determine_draft_value(self, record):
858 """ Determine the value of `self` for the given draft `record`. """
860 self._compute_value(record)
862 record._cache[self] = SpecialValue(self.null(record.env))
864 def determine_inverse(self, records):
865 """ Given the value of `self` on `records`, inverse the computation. """
867 self.inverse(records)
869 def determine_domain(self, records, operator, value):
870 """ Return a domain representing a condition on `self`. """
872 return self.search(records, operator, value)
874 return [(self.name, operator, value)]
876 ############################################################################
878 # Notification when fields are modified
881 def modified(self, records):
882 """ Notify that field `self` has been modified on `records`: prepare the
883 fields/records to recompute, and return a spec indicating what to
886 # invalidate the fields that depend on self, and prepare recomputation
887 spec = [(self, records._ids)]
888 for field, path in self._triggers:
889 if path and field.store:
890 # don't move this line to function top, see log
891 env = records.env(user=SUPERUSER_ID, context={'active_test': False})
892 target = env[field.model_name].search([(path, 'in', records.ids)])
894 spec.append((field, target._ids))
895 target.with_env(records.env)._recompute_todo(field)
897 spec.append((field, None))
901 def modified_draft(self, records):
902 """ Same as :meth:`modified`, but in draft mode. """
905 # invalidate the fields on the records in cache that depend on
906 # `records`, except fields currently being computed
908 for field, path in self._triggers:
909 target = env[field.model_name]
910 computed = target.browse(env.computed[field])
912 target = records - computed
914 target = (target.browse(env.cache[field]) - computed).filtered(
915 lambda rec: rec._mapped_cache(path) & records
918 target = target.browse(env.cache[field]) - computed
921 spec.append((field, target._ids))
926 class Boolean(Field):
929 def convert_to_cache(self, value, record, validate=True):
932 def convert_to_export(self, value, env):
933 if env.context.get('export_raw_data'):
938 class Integer(Field):
941 def convert_to_cache(self, value, record, validate=True):
942 if isinstance(value, dict):
943 # special case, when an integer field is used as inverse for a one2many
944 return value.get('id', False)
945 return int(value or 0)
947 def convert_to_read(self, value, use_name_get=True):
948 # Integer values greater than 2^31-1 are not supported in pure XMLRPC,
949 # so we have to pass them as floats :-(
950 if value and value > xmlrpclib.MAXINT:
954 def _update(self, records, value):
955 # special case, when an integer field is used as inverse for a one2many
956 records._cache[self] = value.id or 0
960 """ The precision digits are given by the attribute
962 :param digits: a pair (total, decimal), or a function taking a database
963 cursor and returning a pair (total, decimal)
966 _digits = None # digits argument passed to class initializer
967 digits = None # digits as computed by setup()
969 def __init__(self, string=None, digits=None, **kwargs):
970 super(Float, self).__init__(string=string, _digits=digits, **kwargs)
972 def _setup_digits(self, env):
973 """ Setup the digits for `self` and its corresponding column """
974 self.digits = self._digits(env.cr) if callable(self._digits) else self._digits
976 assert isinstance(self.digits, (tuple, list)) and len(self.digits) >= 2, \
977 "Float field %s with digits %r, expecting (total, decimal)" % (self, self.digits)
979 column = env[self.model_name]._columns[self.name]
980 column.digits_change(env.cr)
982 def _setup_regular(self, env):
983 super(Float, self)._setup_regular(env)
984 self._setup_digits(env)
986 _related_digits = property(attrgetter('digits'))
988 _description_digits = property(attrgetter('digits'))
990 _column_digits = property(lambda self: not callable(self._digits) and self._digits)
991 _column_digits_compute = property(lambda self: callable(self._digits) and self._digits)
993 def convert_to_cache(self, value, record, validate=True):
994 # apply rounding here, otherwise value in cache may be wrong!
996 return float_round(float(value or 0.0), precision_digits=self.digits[1])
998 return float(value or 0.0)
1001 class _String(Field):
1002 """ Abstract class for string fields. """
1005 _column_translate = property(attrgetter('translate'))
1006 _related_translate = property(attrgetter('translate'))
1007 _description_translate = property(attrgetter('translate'))
1010 class Char(_String):
1011 """ Basic string field, can be length-limited, usually displayed as a
1012 single-line string in clients
1014 :param int size: the maximum size of values stored for that field
1015 :param bool translate: whether the values of this field can be translated
1020 def _setup(self, env):
1021 super(Char, self)._setup(env)
1022 assert isinstance(self.size, (NoneType, int)), \
1023 "Char field %s with non-integer size %r" % (self, self.size)
1025 _column_size = property(attrgetter('size'))
1026 _related_size = property(attrgetter('size'))
1027 _description_size = property(attrgetter('size'))
1029 def convert_to_cache(self, value, record, validate=True):
1030 if value is None or value is False:
1032 return ustr(value)[:self.size]
1034 class Text(_String):
1035 """ Text field. Very similar to :class:`~.Char` but used for longer
1036 contents and displayed as a multiline text box
1038 :param translate: whether the value of this field can be translated
1042 def convert_to_cache(self, value, record, validate=True):
1043 if value is None or value is False:
1047 class Html(_String):
1049 sanitize = True # whether value must be sanitized
1051 _column_sanitize = property(attrgetter('sanitize'))
1052 _related_sanitize = property(attrgetter('sanitize'))
1053 _description_sanitize = property(attrgetter('sanitize'))
1055 def convert_to_cache(self, value, record, validate=True):
1056 if value is None or value is False:
1058 if validate and self.sanitize:
1059 return html_sanitize(value)
1068 """ Return the current day in the format expected by the ORM.
1069 This function may be used to compute default values.
1071 return date.today().strftime(DATE_FORMAT)
1074 def context_today(record, timestamp=None):
1075 """ Return the current date as seen in the client's timezone in a format
1076 fit for date fields. This method may be used to compute default
1079 :param datetime timestamp: optional datetime value to use instead of
1080 the current date and time (must be a datetime, regular dates
1081 can't be converted between timezones.)
1084 today = timestamp or datetime.now()
1085 context_today = None
1086 tz_name = record._context.get('tz') or record.env.user.tz
1089 today_utc = pytz.timezone('UTC').localize(today, is_dst=False) # UTC = no DST
1090 context_today = today_utc.astimezone(pytz.timezone(tz_name))
1092 _logger.debug("failed to compute context/client-specific today date, using UTC value for `today`",
1094 return (context_today or today).strftime(DATE_FORMAT)
1097 def from_string(value):
1098 """ Convert an ORM `value` into a :class:`date` value. """
1099 value = value[:DATE_LENGTH]
1100 return datetime.strptime(value, DATE_FORMAT).date()
1103 def to_string(value):
1104 """ Convert a :class:`date` value into the format expected by the ORM. """
1105 return value.strftime(DATE_FORMAT)
1107 def convert_to_cache(self, value, record, validate=True):
1110 if isinstance(value, basestring):
1112 # force parsing for validation
1113 self.from_string(value)
1114 return value[:DATE_LENGTH]
1115 return self.to_string(value)
1117 def convert_to_export(self, value, env):
1118 if value and env.context.get('export_raw_data'):
1119 return self.from_string(value)
1120 return bool(value) and ustr(value)
1123 class Datetime(Field):
1128 """ Return the current day and time in the format expected by the ORM.
1129 This function may be used to compute default values.
1131 return datetime.now().strftime(DATETIME_FORMAT)
1134 def context_timestamp(record, timestamp):
1135 """Returns the given timestamp converted to the client's timezone.
1136 This method is *not* meant for use as a _defaults initializer,
1137 because datetime fields are automatically converted upon
1138 display on client side. For _defaults you :meth:`fields.datetime.now`
1139 should be used instead.
1141 :param datetime timestamp: naive datetime value (expressed in UTC)
1142 to be converted to the client timezone
1144 :return: timestamp converted to timezone-aware datetime in context
1147 assert isinstance(timestamp, datetime), 'Datetime instance expected'
1148 tz_name = record._context.get('tz') or record.env.user.tz
1151 utc = pytz.timezone('UTC')
1152 context_tz = pytz.timezone(tz_name)
1153 utc_timestamp = utc.localize(timestamp, is_dst=False) # UTC = no DST
1154 return utc_timestamp.astimezone(context_tz)
1156 _logger.debug("failed to compute context/client-specific timestamp, "
1157 "using the UTC value",
1162 def from_string(value):
1163 """ Convert an ORM `value` into a :class:`datetime` value. """
1164 value = value[:DATETIME_LENGTH]
1165 if len(value) == DATE_LENGTH:
1166 value += " 00:00:00"
1167 return datetime.strptime(value, DATETIME_FORMAT)
1170 def to_string(value):
1171 """ Convert a :class:`datetime` value into the format expected by the ORM. """
1172 return value.strftime(DATETIME_FORMAT)
1174 def convert_to_cache(self, value, record, validate=True):
1177 if isinstance(value, basestring):
1179 # force parsing for validation
1180 self.from_string(value)
1181 value = value[:DATETIME_LENGTH]
1182 if len(value) == DATE_LENGTH:
1183 value += " 00:00:00"
1185 return self.to_string(value)
1187 def convert_to_export(self, value, env):
1188 if value and env.context.get('export_raw_data'):
1189 return self.from_string(value)
1190 return bool(value) and ustr(value)
1193 class Binary(Field):
1197 class Selection(Field):
1199 :param selection: specifies the possible values for this field.
1200 It is given as either a list of pairs (`value`, `string`), or a
1201 model method, or a method name.
1202 :param selection_add: provides an extension of the selection in the case
1203 of an overridden field. It is a list of pairs (`value`, `string`).
1205 The attribute `selection` is mandatory except in the case of
1206 :ref:`related fields <field-related>` or :ref:`field extensions
1207 <field-incremental-definition>`.
1210 selection = None # [(value, string), ...], function or method name
1211 selection_add = None # [(value, string), ...]
1213 def __init__(self, selection=None, string=None, **kwargs):
1214 if callable(selection):
1215 from openerp import api
1216 selection = api.expected(api.model, selection)
1217 super(Selection, self).__init__(selection=selection, string=string, **kwargs)
1219 def _setup(self, env):
1220 super(Selection, self)._setup(env)
1221 assert self.selection is not None, "Field %s without selection" % self
1223 def _setup_related(self, env):
1224 super(Selection, self)._setup_related(env)
1225 # selection must be computed on related field
1226 field = self.related_field
1227 self.selection = lambda model: field._description_selection(model.env)
1229 def set_class_name(self, cls, name):
1230 super(Selection, self).set_class_name(cls, name)
1231 # determine selection (applying 'selection_add' extensions)
1233 for field in resolve_all_mro(cls, name, reverse=True):
1234 if isinstance(field, type(self)):
1235 # We cannot use field.selection or field.selection_add here
1236 # because those attributes are overridden by `set_class_name`.
1237 if 'selection' in field._attrs:
1238 selection = field._attrs['selection']
1239 if 'selection_add' in field._attrs:
1240 selection = selection + field._attrs['selection_add']
1243 self.selection = selection
1245 def _description_selection(self, env):
1246 """ return the selection list (pairs (value, label)); labels are
1247 translated according to context language
1249 selection = self.selection
1250 if isinstance(selection, basestring):
1251 return getattr(env[self.model_name], selection)()
1252 if callable(selection):
1253 return selection(env[self.model_name])
1255 # translate selection labels
1257 name = "%s,%s" % (self.model_name, self.name)
1258 translate = partial(
1259 env['ir.translation']._get_source, name, 'selection', env.lang)
1260 return [(value, translate(label) if label else label) for value, label in selection]
1265 def _column_selection(self):
1266 if isinstance(self.selection, basestring):
1267 method = self.selection
1268 return lambda self, *a, **kw: getattr(self, method)(*a, **kw)
1270 return self.selection
1272 def get_values(self, env):
1273 """ return a list of the possible values """
1274 selection = self.selection
1275 if isinstance(selection, basestring):
1276 selection = getattr(env[self.model_name], selection)()
1277 elif callable(selection):
1278 selection = selection(env[self.model_name])
1279 return [value for value, _ in selection]
1281 def convert_to_cache(self, value, record, validate=True):
1283 return value or False
1284 if value in self.get_values(record.env):
1288 raise ValueError("Wrong value for %s: %r" % (self, value))
1290 def convert_to_export(self, value, env):
1291 if not isinstance(self.selection, list):
1292 # FIXME: this reproduces an existing buggy behavior!
1294 for item in self._description_selection(env):
1295 if item[0] == value:
1300 class Reference(Selection):
1304 def __init__(self, selection=None, string=None, **kwargs):
1305 super(Reference, self).__init__(selection=selection, string=string, **kwargs)
1307 def _setup(self, env):
1308 super(Reference, self)._setup(env)
1309 assert isinstance(self.size, (NoneType, int)), \
1310 "Reference field %s with non-integer size %r" % (self, self.size)
1312 _related_size = property(attrgetter('size'))
1314 _column_size = property(attrgetter('size'))
1316 def convert_to_cache(self, value, record, validate=True):
1317 if isinstance(value, BaseModel):
1318 if ((not validate or value._name in self.get_values(record.env))
1319 and len(value) <= 1):
1320 return value.with_env(record.env) or False
1321 elif isinstance(value, basestring):
1322 res_model, res_id = value.split(',')
1323 return record.env[res_model].browse(int(res_id))
1326 raise ValueError("Wrong value for %s: %r" % (self, value))
1328 def convert_to_read(self, value, use_name_get=True):
1329 return "%s,%s" % (value._name, value.id) if value else False
1331 def convert_to_export(self, value, env):
1332 return bool(value) and value.name_get()[0][1]
1334 def convert_to_display_name(self, value):
1335 return ustr(value and value.display_name)
1338 class _Relational(Field):
1339 """ Abstract class for relational fields. """
1341 domain = None # domain for searching values
1342 context = None # context for searching values
1344 def _setup(self, env):
1345 super(_Relational, self)._setup(env)
1346 assert self.comodel_name in env.registry, \
1347 "Field %s with unknown comodel_name %r" % (self, self.comodel_name)
1350 def _related_domain(self):
1351 if callable(self.domain):
1352 # will be called with another model than self's
1353 return lambda recs: self.domain(recs.env[self.model_name])
1355 # maybe not correct if domain is a string...
1358 _related_context = property(attrgetter('context'))
1360 _description_relation = property(attrgetter('comodel_name'))
1361 _description_context = property(attrgetter('context'))
1363 def _description_domain(self, env):
1364 return self.domain(env[self.model_name]) if callable(self.domain) else self.domain
1366 _column_obj = property(attrgetter('comodel_name'))
1367 _column_domain = property(attrgetter('domain'))
1368 _column_context = property(attrgetter('context'))
1370 def null(self, env):
1371 return env[self.comodel_name]
1373 def modified(self, records):
1374 # Invalidate cache for self.inverse_fields, too. Note that recomputation
1375 # of fields that depend on self.inverse_fields is already covered by the
1376 # triggers (see above).
1377 spec = super(_Relational, self).modified(records)
1378 for invf in self.inverse_fields:
1379 spec.append((invf, None))
1383 class Many2one(_Relational):
1384 """ The value of such a field is a recordset of size 0 (no
1385 record) or 1 (a single record).
1387 :param comodel_name: name of the target model (string)
1389 :param domain: an optional domain to set on candidate values on the
1390 client side (domain or string)
1392 :param context: an optional context to use on the client side when
1393 handling that field (dictionary)
1395 :param ondelete: what to do when the referred record is deleted;
1396 possible values are: ``'set null'``, ``'restrict'``, ``'cascade'``
1398 :param auto_join: whether JOINs are generated upon search through that
1399 field (boolean, by default ``False``)
1401 :param delegate: set it to ``True`` to make fields of the target model
1402 accessible from the current model (corresponds to ``_inherits``)
1404 The attribute `comodel_name` is mandatory except in the case of related
1405 fields or field extensions.
1408 ondelete = 'set null' # what to do when value is deleted
1409 auto_join = False # whether joins are generated upon search
1410 delegate = False # whether self implements delegation
1412 def __init__(self, comodel_name=None, string=None, **kwargs):
1413 super(Many2one, self).__init__(comodel_name=comodel_name, string=string, **kwargs)
1415 def set_class_name(self, cls, name):
1416 super(Many2one, self).set_class_name(cls, name)
1417 # determine self.delegate
1418 if not self.delegate:
1419 self.delegate = name in cls._inherits.values()
1421 _column_ondelete = property(attrgetter('ondelete'))
1422 _column_auto_join = property(attrgetter('auto_join'))
1424 def _update(self, records, value):
1425 """ Update the cached value of `self` for `records` with `value`. """
1426 records._cache[self] = value
1428 def convert_to_cache(self, value, record, validate=True):
1429 if isinstance(value, (NoneType, int)):
1430 return record.env[self.comodel_name].browse(value)
1431 if isinstance(value, BaseModel):
1432 if value._name == self.comodel_name and len(value) <= 1:
1433 return value.with_env(record.env)
1434 raise ValueError("Wrong value for %s: %r" % (self, value))
1435 elif isinstance(value, tuple):
1436 return record.env[self.comodel_name].browse(value[0])
1437 elif isinstance(value, dict):
1438 return record.env[self.comodel_name].new(value)
1440 return record.env[self.comodel_name].browse(value)
1442 def convert_to_read(self, value, use_name_get=True):
1443 if use_name_get and value:
1444 # evaluate name_get() as superuser, because the visibility of a
1445 # many2one field value (id and name) depends on the current record's
1446 # access rights, and not the value's access rights.
1448 return value.sudo().name_get()[0]
1449 except MissingError:
1450 # Should not happen, unless the foreign key is missing.
1455 def convert_to_write(self, value, target=None, fnames=None):
1458 def convert_to_onchange(self, value):
1461 def convert_to_export(self, value, env):
1462 return bool(value) and value.name_get()[0][1]
1464 def convert_to_display_name(self, value):
1465 return ustr(value.display_name)
1468 class UnionUpdate(SpecialValue):
1469 """ Placeholder for a value update; when this value is taken from the cache,
1470 it returns ``record[field.name] | value`` and stores it in the cache.
1472 def __init__(self, field, record, value):
1473 self.args = (field, record, value)
1476 field, record, value = self.args
1477 # in order to read the current field's value, remove self from cache
1478 del record._cache[field]
1479 # read the current field's value, and update it in cache only
1480 record._cache[field] = new_value = record[field.name] | value
1484 class _RelationalMulti(_Relational):
1485 """ Abstract class for relational fields *2many. """
1487 def _update(self, records, value):
1488 """ Update the cached value of `self` for `records` with `value`. """
1489 for record in records:
1490 if self in record._cache:
1491 record._cache[self] = record[self.name] | value
1493 record._cache[self] = UnionUpdate(self, record, value)
1495 def convert_to_cache(self, value, record, validate=True):
1496 if isinstance(value, BaseModel):
1497 if value._name == self.comodel_name:
1498 return value.with_env(record.env)
1499 elif isinstance(value, list):
1500 # value is a list of record ids or commands
1502 record = record.browse() # new record has no value
1503 result = record[self.name]
1504 # modify result with the commands;
1505 # beware to not introduce duplicates in result
1506 for command in value:
1507 if isinstance(command, (tuple, list)):
1509 result += result.new(command[2])
1510 elif command[0] == 1:
1511 result.browse(command[1]).update(command[2])
1512 result += result.browse(command[1]) - result
1513 elif command[0] == 2:
1514 # note: the record will be deleted by write()
1515 result -= result.browse(command[1])
1516 elif command[0] == 3:
1517 result -= result.browse(command[1])
1518 elif command[0] == 4:
1519 result += result.browse(command[1]) - result
1520 elif command[0] == 5:
1521 result = result.browse()
1522 elif command[0] == 6:
1523 result = result.browse(command[2])
1524 elif isinstance(command, dict):
1525 result += result.new(command)
1527 result += result.browse(command) - result
1530 return self.null(record.env)
1531 raise ValueError("Wrong value for %s: %s" % (self, value))
1533 def convert_to_read(self, value, use_name_get=True):
1536 def convert_to_write(self, value, target=None, fnames=None):
1537 # remove/delete former records
1540 result = [(6, 0, set_ids)]
1541 add_existing = lambda id: set_ids.append(id)
1543 tag = 2 if self.type == 'one2many' else 3
1544 result = [(tag, record.id) for record in target[self.name] - value]
1545 add_existing = lambda id: result.append((4, id))
1548 # take all fields in cache, except the inverses of self
1549 fnames = set(value._fields) - set(MAGIC_COLUMNS)
1550 for invf in self.inverse_fields:
1551 fnames.discard(invf.name)
1553 # add new and existing records
1554 for record in value:
1555 if not record.id or record._dirty:
1556 values = dict((k, v) for k, v in record._cache.iteritems() if k in fnames)
1557 values = record._convert_to_write(values)
1559 result.append((0, 0, values))
1561 result.append((1, record.id, values))
1563 add_existing(record.id)
1567 def convert_to_export(self, value, env):
1568 return bool(value) and ','.join(name for id, name in value.name_get())
1570 def convert_to_display_name(self, value):
1571 raise NotImplementedError()
1573 def _compute_related(self, records):
1574 """ Compute the related field `self` on `records`. """
1575 for record in records:
1577 # traverse the intermediate fields, and keep at most one record
1578 for name in self.related[:-1]:
1579 value = value[name][:1]
1580 record[self.name] = value[self.related[-1]]
1583 class One2many(_RelationalMulti):
1584 """ One2many field; the value of such a field is the recordset of all the
1585 records in `comodel_name` such that the field `inverse_name` is equal to
1588 :param comodel_name: name of the target model (string)
1590 :param inverse_name: name of the inverse `Many2one` field in
1591 `comodel_name` (string)
1593 :param domain: an optional domain to set on candidate values on the
1594 client side (domain or string)
1596 :param context: an optional context to use on the client side when
1597 handling that field (dictionary)
1599 :param auto_join: whether JOINs are generated upon search through that
1600 field (boolean, by default ``False``)
1602 :param limit: optional limit to use upon read (integer)
1604 The attributes `comodel_name` and `inverse_name` are mandatory except in
1605 the case of related fields or field extensions.
1608 inverse_name = None # name of the inverse field
1609 auto_join = False # whether joins are generated upon search
1610 limit = None # optional limit to use upon read
1611 copy = False # o2m are not copied by default
1613 def __init__(self, comodel_name=None, inverse_name=None, string=None, **kwargs):
1614 super(One2many, self).__init__(
1615 comodel_name=comodel_name,
1616 inverse_name=inverse_name,
1621 def _setup_regular(self, env):
1622 super(One2many, self)._setup_regular(env)
1624 if self.inverse_name:
1625 # link self to its inverse field and vice-versa
1626 invf = env[self.comodel_name]._fields[self.inverse_name]
1627 # In some rare cases, a `One2many` field can link to `Int` field
1628 # (res_model/res_id pattern). Only inverse the field if this is
1629 # a `Many2one` field.
1630 if isinstance(invf, Many2one):
1631 self.inverse_fields.append(invf)
1632 invf.inverse_fields.append(self)
1634 _description_relation_field = property(attrgetter('inverse_name'))
1636 _column_fields_id = property(attrgetter('inverse_name'))
1637 _column_auto_join = property(attrgetter('auto_join'))
1638 _column_limit = property(attrgetter('limit'))
1641 class Many2many(_RelationalMulti):
1642 """ Many2many field; the value of such a field is the recordset.
1644 :param comodel_name: name of the target model (string)
1646 The attribute `comodel_name` is mandatory except in the case of related
1647 fields or field extensions.
1649 :param relation: optional name of the table that stores the relation in
1650 the database (string)
1652 :param column1: optional name of the column referring to "these" records
1653 in the table `relation` (string)
1655 :param column2: optional name of the column referring to "those" records
1656 in the table `relation` (string)
1658 The attributes `relation`, `column1` and `column2` are optional. If not
1659 given, names are automatically generated from model names, provided
1660 `model_name` and `comodel_name` are different!
1662 :param domain: an optional domain to set on candidate values on the
1663 client side (domain or string)
1665 :param context: an optional context to use on the client side when
1666 handling that field (dictionary)
1668 :param limit: optional limit to use upon read (integer)
1672 relation = None # name of table
1673 column1 = None # column of table referring to model
1674 column2 = None # column of table referring to comodel
1675 limit = None # optional limit to use upon read
1677 def __init__(self, comodel_name=None, relation=None, column1=None, column2=None,
1678 string=None, **kwargs):
1679 super(Many2many, self).__init__(
1680 comodel_name=comodel_name,
1688 def _setup_regular(self, env):
1689 super(Many2many, self)._setup_regular(env)
1691 if self.store and not self.relation:
1692 model = env[self.model_name]
1693 column = model._columns[self.name]
1694 if not isinstance(column, fields.function):
1695 self.relation, self.column1, self.column2 = column._sql_names(model)
1698 m2m = env.registry._m2m
1699 # if inverse field has already been setup, it is present in m2m
1700 invf = m2m.get((self.relation, self.column2, self.column1))
1702 self.inverse_fields.append(invf)
1703 invf.inverse_fields.append(self)
1705 # add self in m2m, so that its inverse field can find it
1706 m2m[(self.relation, self.column1, self.column2)] = self
1708 _column_rel = property(attrgetter('relation'))
1709 _column_id1 = property(attrgetter('column1'))
1710 _column_id2 = property(attrgetter('column2'))
1711 _column_limit = property(attrgetter('limit'))
1715 """ Special case for field 'id'. """
1717 #: Can't write this!
1720 def __init__(self, string=None, **kwargs):
1721 super(Id, self).__init__(type='integer', string=string, **kwargs)
1723 def to_column(self):
1724 return fields.integer('ID')
1726 def __get__(self, record, owner):
1728 return self # the field is accessed through the class owner
1731 return record.ensure_one()._ids[0]
1733 def __set__(self, record, value):
1734 raise TypeError("field 'id' cannot be assigned")
1737 # imported here to avoid dependency cycle issues
1738 from openerp import SUPERUSER_ID
1739 from .exceptions import Warning, AccessError, MissingError
1740 from .models import BaseModel, MAGIC_COLUMNS
1741 from .osv import fields