How to use _is_relation_to method in autotest

Best Python code snippet using autotest_python

model_logic.py

Source:model_logic.py

...178        sql_query = 'SELECT ' + distinct + ','.join(selects) + where179        cursor = readonly_connection.connection().cursor()180        cursor.execute(sql_query, params)181        return cursor.fetchall()182    def _is_relation_to(self, field, model_class):183        return field.rel and field.rel.to is model_class184    def _get_pivot_iterator(self, base_objects_by_id, related_model):185        """186        Determine the relationship between this model and related_model, and187        return a pivot iterator.188        @param base_objects_by_id: dict of instances of this model indexed by189        their IDs190        @returns a pivot iterator, which yields a tuple (base_object,191        related_object) for each relationship between a base object and a192        related object.  all base_object instances come from base_objects_by_id.193        Note -- this depends on Django model internals and will likely need to194        be updated when we move to Django 1.x.195        """196        # look for a field on related_model relating to this model197        for field in related_model._meta.fields:198            if self._is_relation_to(field, self.model):199                # many-to-one200                return self._many_to_one_pivot(base_objects_by_id,201                                               related_model, field)202        for field in related_model._meta.many_to_many:203            if self._is_relation_to(field, self.model):204                # many-to-many205                return self._many_to_many_pivot(206                    base_objects_by_id, related_model, field.m2m_db_table(),207                    field.m2m_reverse_name(), field.m2m_column_name())208        # maybe this model has the many-to-many field209        for field in self.model._meta.many_to_many:210            if self._is_relation_to(field, related_model):211                return self._many_to_many_pivot(212                    base_objects_by_id, related_model, field.m2m_db_table(),213                    field.m2m_column_name(), field.m2m_reverse_name())214        raise ValueError('%s has no relation to %s' %215                         (related_model, self.model))216    def _many_to_one_pivot(self, base_objects_by_id, related_model,217                           foreign_key_field):218        """219        @returns a pivot iterator - see _get_pivot_iterator()220        """221        filter_data = {foreign_key_field.name + '__pk__in':222                       base_objects_by_id.keys()}223        for related_object in related_model.objects.filter(**filter_data):224            fresh_base_object = getattr(related_object, foreign_key_field.name)...

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