我们从Python开源项目中，提取了以下25个代码示例，用于说明如何使用django.db.models.fields.AutoField()。
def get_django_field_map(self): from django.db.models import fields as djf return [ (djf.AutoField, PrimaryKeyField), (djf.BigIntegerField, BigIntegerField), # (djf.BinaryField, BlobField), (djf.BooleanField, BooleanField), (djf.CharField, CharField), (djf.DateTimeField, DateTimeField), # Extends DateField. (djf.DateField, DateField), (djf.DecimalField, DecimalField), (djf.FilePathField, CharField), (djf.FloatField, FloatField), (djf.IntegerField, IntegerField), (djf.NullBooleanField, partial(BooleanField, null=True)), (djf.TextField, TextField), (djf.TimeField, TimeField), (djf.related.ForeignKey, ForeignKeyField), ]
def _decodeValue(self, field, value): if value is pyamf.Undefined: return fields.NOT_PROVIDED if isinstance(field, fields.AutoField) and value == 0: return None elif isinstance(field, fields.DateTimeField): # deal with dates return value elif isinstance(field, fields.DateField): if not value: return None return datetime.date(value.year, value.month, value.day) elif isinstance(field, fields.TimeField): if not value: return None return datetime.time( value.hour, value.minute, value.second, value.microsecond, ) return value
def _prepare(self, model): if self.order_with_respect_to: # The app registry will not be ready at this point, so we cannot # use get_field(). query = self.order_with_respect_to try: self.order_with_respect_to = next( f for f in self._get_fields(reverse=False) if f.name == query or f.attname == query ) except StopIteration: raise FieldDoesNotExist('%s has no field named %r' % (self.object_name, query)) self.ordering = ('_order',) if not any(isinstance(field, OrderWrt) for field in model._meta.local_fields): model.add_to_class('_order', OrderWrt()) else: self.order_with_respect_to = None if self.pk is None: if self.parents: # Promote the first parent link in lieu of adding yet another # field. field = next(six.itervalues(self.parents)) # Look for a local field with the same name as the # first parent link. If a local field has already been # created, use it instead of promoting the parent already_created = [fld for fld in self.local_fields if fld.name == field.name] if already_created: field = already_created[0] field.primary_key = True self.setup_pk(field) else: auto = AutoField(verbose_name='ID', primary_key=True, auto_created=True) model.add_to_class('id', auto)
def filter_fields_to_type(klass, query_dict): reserved_fields = ['order_by', 'format', 'limit', 'offset'] q = QuerySet(klass) query = dict(query_dict) fields = {} for field in q.model._meta.fields: fields[field.column] = field # Remove the reserved fields we know about. for field in query.keys(): if field in reserved_fields: del query[field] # This will error if it find an unknown field and cause the standard tasty pie query to run. for field in query.keys(): try: field_type = type(fields[field]) value = query[field] if field_type == django_fields.AutoField or field_type == django_fields.IntegerField: value = int(value) elif field_type == django_fields.BooleanField: value = (value.lower() == 'true') query[field] = value except KeyError: pass return query # monkey-patch ResourceOptions to have a default-empty readonly list
def _prepare(self, model): if self.order_with_respect_to: # The app registry will not be ready at this point, so we cannot # use get_field(). query = self.order_with_respect_to try: self.order_with_respect_to = next( f for f in self._get_fields(reverse=False) if f.name == query or f.attname == query ) except StopIteration: raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, query)) self.ordering = ('_order',) if not any(isinstance(field, OrderWrt) for field in model._meta.local_fields): model.add_to_class('_order', OrderWrt()) else: self.order_with_respect_to = None if self.pk is None: if self.parents: # Promote the first parent link in lieu of adding yet another # field. field = next(six.itervalues(self.parents)) # Look for a local field with the same name as the # first parent link. If a local field has already been # created, use it instead of promoting the parent already_created = [fld for fld in self.local_fields if fld.name == field.name] if already_created: field = already_created[0] field.primary_key = True self.setup_pk(field) if not field.remote_field.parent_link: warnings.warn( 'Add parent_link=True to %s as an implicit link is ' 'deprecated.' % field, RemovedInDjango20Warning ) else: auto = AutoField(verbose_name='ID', primary_key=True, auto_created=True) model.add_to_class('id', auto)
def _get_user_field_names(self): """ Returns the list of user defined (i.e. non-mptt internal) field names. """ from django.db.models.fields import AutoField field_names = [] internal_fields = ( self._mptt_meta.left_attr, self._mptt_meta.right_attr, self._mptt_meta.tree_id_attr, self._mptt_meta.level_attr, self._mptt_meta.parent_attr) for field in self._meta.fields: if (field.name not in internal_fields) and (not isinstance(field, AutoField)) and (not field.primary_key): # noqa field_names.append(field.name) return field_names
def bulk_create(self, objs, batch_size=None): """ Inserts each of the instances into the database. This does *not* call save() on each of the instances, does not send any pre/post save signals, and does not set the primary key attribute if it is an autoincrement field. """ # So this case is fun. When you bulk insert you don't get the primary # keys back (if it's an autoincrement), so you can't insert into the # child tables which references this. There are two workarounds, 1) # this could be implemented if you didn't have an autoincrement pk, # and 2) you could do it by doing O(n) normal inserts into the parent # tables to get the primary keys back, and then doing a single bulk # insert into the childmost table. Some databases might allow doing # this by using RETURNING clause for the insert query. We're punting # on these for now because they are relatively rare cases. assert batch_size is None or batch_size > 0 if self.model._meta.parents: raise ValueError("Can't bulk create an inherited model") if not objs: return objs self._for_write = True connection = connections[self.db] fields = self.model._meta.local_concrete_fields objs = list(objs) self._populate_pk_values(objs) with transaction.atomic(using=self.db, savepoint=False): if (connection.features.can_combine_inserts_with_and_without_auto_increment_pk and self.model._meta.has_auto_field): self._batched_insert(objs, fields, batch_size) else: objs_with_pk, objs_without_pk = partition(lambda o: o.pk is None, objs) if objs_with_pk: self._batched_insert(objs_with_pk, fields, batch_size) if objs_without_pk: fields = [f for f in fields if not isinstance(f, AutoField)] self._batched_insert(objs_without_pk, fields, batch_size) return objs
def bulk_create(self, objs, batch_size=None): """ Inserts each of the instances into the database. This does *not* call save() on each of the instances, does not send any pre/post save signals, and does not set the primary key attribute if it is an autoincrement field. Multi-table models are not supported. """ # So this case is fun. When you bulk insert you don't get the primary # keys back (if it's an autoincrement), so you can't insert into the # child tables which references this. There are two workarounds, 1) # this could be implemented if you didn't have an autoincrement pk, # and 2) you could do it by doing O(n) normal inserts into the parent # tables to get the primary keys back, and then doing a single bulk # insert into the childmost table. Some databases might allow doing # this by using RETURNING clause for the insert query. We're punting # on these for now because they are relatively rare cases. assert batch_size is None or batch_size > 0 # Check that the parents share the same concrete model with the our # model to detect the inheritance pattern ConcreteGrandParent -> # MultiTableParent -> ProxyChild. Simply checking self.model._meta.proxy # would not identify that case as involving multiple tables. for parent in self.model._meta.get_parent_list(): if parent._meta.concrete_model is not self.model._meta.concrete_model: raise ValueError("Can't bulk create a multi-table inherited model") if not objs: return objs self._for_write = True connection = connections[self.db] fields = self.model._meta.concrete_fields objs = list(objs) self._populate_pk_values(objs) with transaction.atomic(using=self.db, savepoint=False): if (connection.features.can_combine_inserts_with_and_without_auto_increment_pk and self.model._meta.has_auto_field): self._batched_insert(objs, fields, batch_size) else: objs_with_pk, objs_without_pk = partition(lambda o: o.pk is None, objs) if objs_with_pk: self._batched_insert(objs_with_pk, fields, batch_size) if objs_without_pk: fields = [f for f in fields if not isinstance(f, AutoField)] self._batched_insert(objs_without_pk, fields, batch_size) return objs
def _save_table(self, raw=False, cls=None, force_insert=False, force_update=False, using=None, update_fields=None): """ Does the heavy-lifting involved in saving. Updates or inserts the data for a single table. """ meta = cls._meta non_pks = [f for f in meta.local_concrete_fields if not f.primary_key] if update_fields: non_pks = [f for f in non_pks if f.name in update_fields or f.attname in update_fields] pk_val = self._get_pk_val(meta) if pk_val is None: pk_val = meta.pk.get_pk_value_on_save(self) setattr(self, meta.pk.attname, pk_val) pk_set = pk_val is not None if not pk_set and (force_update or update_fields): raise ValueError("Cannot force an update in save() with no primary key.") updated = False # If possible, try an UPDATE. If that doesn't update anything, do an INSERT. if pk_set and not force_insert: base_qs = cls._base_manager.using(using) values = [(f, None, (getattr(self, f.attname) if raw else f.pre_save(self, False))) for f in non_pks] forced_update = update_fields or force_update updated = self._do_update(base_qs, using, pk_val, values, update_fields, forced_update) if force_update and not updated: raise DatabaseError("Forced update did not affect any rows.") if update_fields and not updated: raise DatabaseError("Save with update_fields did not affect any rows.") if not updated: if meta.order_with_respect_to: # If this is a model with an order_with_respect_to # autopopulate the _order field field = meta.order_with_respect_to filter_args = field.get_filter_kwargs_for_object(self) order_value = cls._base_manager.using(using).filter(**filter_args).count() self._order = order_value fields = meta.local_concrete_fields if not pk_set: fields = [f for f in fields if not isinstance(f, AutoField)] update_pk = bool(meta.has_auto_field and not pk_set) result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) if update_pk: setattr(self, meta.pk.attname, result) return updated
def bulk_create(self, objs, batch_size=None): """ Inserts each of the instances into the database. This does *not* call save() on each of the instances, does not send any pre/post save signals, and does not set the primary key attribute if it is an autoincrement field (except if features.can_return_ids_from_bulk_insert=True). Multi-table models are not supported. """ # When you bulk insert you don't get the primary keys back (if it's an # autoincrement, except if can_return_ids_from_bulk_insert=True), so # you can't insert into the child tables which references this. There # are two workarounds: # 1) This could be implemented if you didn't have an autoincrement pk # 2) You could do it by doing O(n) normal inserts into the parent # tables to get the primary keys back and then doing a single bulk # insert into the childmost table. # We currently set the primary keys on the objects when using # PostgreSQL via the RETURNING ID clause. It should be possible for # Oracle as well, but the semantics for extracting the primary keys is # trickier so it's not done yet. assert batch_size is None or batch_size > 0 # Check that the parents share the same concrete model with the our # model to detect the inheritance pattern ConcreteGrandParent -> # MultiTableParent -> ProxyChild. Simply checking self.model._meta.proxy # would not identify that case as involving multiple tables. for parent in self.model._meta.get_parent_list(): if parent._meta.concrete_model is not self.model._meta.concrete_model: raise ValueError("Can't bulk create a multi-table inherited model") if not objs: return objs self._for_write = True connection = connections[self.db] fields = self.model._meta.concrete_fields objs = list(objs) self._populate_pk_values(objs) with transaction.atomic(using=self.db, savepoint=False): if (connection.features.can_combine_inserts_with_and_without_auto_increment_pk and self.model._meta.has_auto_field): self._batched_insert(objs, fields, batch_size) else: objs_with_pk, objs_without_pk = partition(lambda o: o.pk is None, objs) if objs_with_pk: self._batched_insert(objs_with_pk, fields, batch_size) if objs_without_pk: fields = [f for f in fields if not isinstance(f, AutoField)] ids = self._batched_insert(objs_without_pk, fields, batch_size) if connection.features.can_return_ids_from_bulk_insert: assert len(ids) == len(objs_without_pk) for obj_without_pk, pk in zip(objs_without_pk, ids): obj_without_pk.pk = pk obj_without_pk._state.adding = False obj_without_pk._state.db = self.db return objs
def bulk_create(self, objs, batch_size=None): """ Inserts each of the instances into the database. This does *not* call save() on each of the instances, does not send any pre/post save signals, and does not set the primary key attribute if it is an autoincrement field (except if features.can_return_ids_from_bulk_insert=True). Multi-table models are not supported. """ # When you bulk insert you don't get the primary keys back (if it's an # autoincrement, except if can_return_ids_from_bulk_insert=True), so # you can't insert into the child tables which references this. There # are two workarounds: # 1) This could be implemented if you didn't have an autoincrement pk # 2) You could do it by doing O(n) normal inserts into the parent # tables to get the primary keys back and then doing a single bulk # insert into the childmost table. # We currently set the primary keys on the objects when using # PostgreSQL via the RETURNING ID clause. It should be possible for # Oracle as well, but the semantics for extracting the primary keys is # trickier so it's not done yet. assert batch_size is None or batch_size > 0 # Check that the parents share the same concrete model with the our # model to detect the inheritance pattern ConcreteGrandParent -> # MultiTableParent -> ProxyChild. Simply checking self.model._meta.proxy # would not identify that case as involving multiple tables. for parent in self.model._meta.get_parent_list(): if parent._meta.concrete_model is not self.model._meta.concrete_model: raise ValueError("Can't bulk create a multi-table inherited model") if not objs: return objs self._for_write = True connection = connections[self.db] fields = self.model._meta.concrete_fields objs = list(objs) self._populate_pk_values(objs) with transaction.atomic(using=self.db, savepoint=False): objs_with_pk, objs_without_pk = partition(lambda o: o.pk is None, objs) if objs_with_pk: self._batched_insert(objs_with_pk, fields, batch_size) if objs_without_pk: fields = [f for f in fields if not isinstance(f, AutoField)] ids = self._batched_insert(objs_without_pk, fields, batch_size) if connection.features.can_return_ids_from_bulk_insert: assert len(ids) == len(objs_without_pk) for obj_without_pk, pk in zip(objs_without_pk, ids): obj_without_pk.pk = pk obj_without_pk._state.adding = False obj_without_pk._state.db = self.db return objs
def _save_table(self, raw=False, cls=None, force_insert=False, force_update=False, using=None, update_fields=None): """ Does the heavy-lifting involved in saving. Updates or inserts the data for a single table. """ meta = cls._meta non_pks = [f for f in meta.local_concrete_fields if not f.primary_key] if update_fields: non_pks = [f for f in non_pks if f.name in update_fields or f.attname in update_fields] pk_val = self._get_pk_val(meta) if pk_val is None: pk_val = meta.pk.get_pk_value_on_save(self) setattr(self, meta.pk.attname, pk_val) pk_set = pk_val is not None if not pk_set and (force_update or update_fields): raise ValueError("Cannot force an update in save() with no primary key.") updated = False # If possible, try an UPDATE. If that doesn't update anything, do an INSERT. if pk_set and not force_insert: base_qs = cls._base_manager.using(using) values = [(f, None, (getattr(self, f.attname) if raw else f.pre_save(self, False))) for f in non_pks] forced_update = update_fields or force_update updated = self._do_update(base_qs, using, pk_val, values, update_fields, forced_update) if force_update and not updated: raise DatabaseError("Forced update did not affect any rows.") if update_fields and not updated: raise DatabaseError("Save with update_fields did not affect any rows.") if not updated: if meta.order_with_respect_to: # If this is a model with an order_with_respect_to # autopopulate the _order field field = meta.order_with_respect_to order_value = cls._base_manager.using(using).filter( **{field.name: getattr(self, field.attname)}).count() self._order = order_value fields = meta.local_concrete_fields if not pk_set: fields = [f for f in fields if not isinstance(f, AutoField)] update_pk = bool(meta.has_auto_field and not pk_set) result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) if update_pk: setattr(self, meta.pk.attname, result) return updated
