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e8171daf0c
This allows using get_field() early in the app loading process. Thanks to PirosB3 and Tim Graham.
254 lines
11 KiB
Python
254 lines
11 KiB
Python
from django.apps import apps
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from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
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from django.core.exceptions import FieldDoesNotExist
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from django.db.models.fields import related, CharField, Field
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from django.db.models.options import IMMUTABLE_WARNING, EMPTY_RELATION_TREE
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from django.test import TestCase
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from .models import Relation, AbstractPerson, BasePerson, Person, ProxyPerson, Relating
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from .results import TEST_RESULTS
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class OptionsBaseTests(TestCase):
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def _map_related_query_names(self, res):
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return tuple((o.name, m) for o, m in res)
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def _map_names(self, res):
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return tuple((f.name, m) for f, m in res)
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def _model(self, current_model, field):
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model = field.model._meta.concrete_model
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return None if model == current_model else model
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def _details(self, current_model, relation):
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direct = isinstance(relation, Field) or isinstance(relation, GenericForeignKey)
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model = relation.model._meta.concrete_model
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if model == current_model:
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model = None
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field = relation if direct else relation.field
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m2m = isinstance(field, related.ManyToManyField)
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return relation, model, direct, m2m
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class GetFieldsTests(OptionsBaseTests):
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def test_get_fields_is_immutable(self):
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msg = IMMUTABLE_WARNING % "get_fields()"
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for _ in range(2):
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# Running unit test twice to ensure both non-cached and cached result
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# are immutable.
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fields = Person._meta.get_fields()
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with self.assertRaisesMessage(AttributeError, msg):
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fields += ["errors"]
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class DataTests(OptionsBaseTests):
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def test_fields(self):
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for model, expected_result in TEST_RESULTS['fields'].items():
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fields = model._meta.fields
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self.assertEqual([f.attname for f in fields], expected_result)
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def test_local_fields(self):
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is_data_field = lambda f: isinstance(f, Field) and not isinstance(f, related.ManyToManyField)
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for model, expected_result in TEST_RESULTS['local_fields'].items():
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fields = model._meta.local_fields
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self.assertEqual([f.attname for f in fields], expected_result)
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for f in fields:
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self.assertEqual(f.model, model)
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self.assertTrue(is_data_field(f))
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def test_local_concrete_fields(self):
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for model, expected_result in TEST_RESULTS['local_concrete_fields'].items():
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fields = model._meta.local_concrete_fields
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self.assertEqual([f.attname for f in fields], expected_result)
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for f in fields:
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self.assertIsNotNone(f.column)
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class M2MTests(OptionsBaseTests):
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def test_many_to_many(self):
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for model, expected_result in TEST_RESULTS['many_to_many'].items():
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fields = model._meta.many_to_many
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self.assertEqual([f.attname for f in fields], expected_result)
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for f in fields:
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self.assertTrue(f.many_to_many and f.is_relation)
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def test_many_to_many_with_model(self):
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for model, expected_result in TEST_RESULTS['many_to_many_with_model'].items():
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models = [self._model(model, field) for field in model._meta.many_to_many]
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self.assertEqual(models, expected_result)
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class RelatedObjectsTests(OptionsBaseTests):
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key_name = lambda self, r: r[0]
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def test_related_objects(self):
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result_key = 'get_all_related_objects_with_model'
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for model, expected in TEST_RESULTS[result_key].items():
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objects = [
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(field, self._model(model, field))
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for field in model._meta.get_fields()
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if field.auto_created and not field.concrete
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]
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self.assertEqual(self._map_related_query_names(objects), expected)
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def test_related_objects_local(self):
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result_key = 'get_all_related_objects_with_model_local'
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for model, expected in TEST_RESULTS[result_key].items():
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objects = [
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(field, self._model(model, field))
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for field in model._meta.get_fields(include_parents=False)
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if field.auto_created and not field.concrete
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]
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self.assertEqual(self._map_related_query_names(objects), expected)
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def test_related_objects_include_hidden(self):
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result_key = 'get_all_related_objects_with_model_hidden'
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for model, expected in TEST_RESULTS[result_key].items():
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objects = [
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(field, self._model(model, field))
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for field in model._meta.get_fields(include_hidden=True)
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if field.auto_created and not field.concrete
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]
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self.assertEqual(
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sorted(self._map_names(objects), key=self.key_name),
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sorted(expected, key=self.key_name)
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)
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def test_related_objects_include_hidden_local_only(self):
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result_key = 'get_all_related_objects_with_model_hidden_local'
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for model, expected in TEST_RESULTS[result_key].items():
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objects = [
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(field, self._model(model, field))
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for field in model._meta.get_fields(include_hidden=True, include_parents=False)
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if field.auto_created and not field.concrete
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]
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self.assertEqual(
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sorted(self._map_names(objects), key=self.key_name),
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sorted(expected, key=self.key_name)
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)
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class VirtualFieldsTests(OptionsBaseTests):
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def test_virtual_fields(self):
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for model, expected_names in TEST_RESULTS['virtual_fields'].items():
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objects = model._meta.virtual_fields
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self.assertEqual(sorted([f.name for f in objects]), sorted(expected_names))
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class GetFieldByNameTests(OptionsBaseTests):
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def test_get_data_field(self):
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field_info = self._details(Person, Person._meta.get_field('data_abstract'))
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self.assertEqual(field_info[1:], (BasePerson, True, False))
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self.assertIsInstance(field_info[0], CharField)
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def test_get_m2m_field(self):
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field_info = self._details(Person, Person._meta.get_field('m2m_base'))
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self.assertEqual(field_info[1:], (BasePerson, True, True))
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self.assertIsInstance(field_info[0], related.ManyToManyField)
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def test_get_related_object(self):
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field_info = self._details(Person, Person._meta.get_field('relating_baseperson'))
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self.assertEqual(field_info[1:], (BasePerson, False, False))
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self.assertIsInstance(field_info[0], related.ForeignObjectRel)
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def test_get_related_m2m(self):
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field_info = self._details(Person, Person._meta.get_field('relating_people'))
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self.assertEqual(field_info[1:], (None, False, True))
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self.assertIsInstance(field_info[0], related.ForeignObjectRel)
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def test_get_generic_relation(self):
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field_info = self._details(Person, Person._meta.get_field('generic_relation_base'))
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self.assertEqual(field_info[1:], (None, True, False))
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self.assertIsInstance(field_info[0], GenericRelation)
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def test_get_fields_when_apps_not_ready(self):
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opts = Person._meta
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# If apps registry is not ready, get_field() searches over only
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# forward fields.
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opts.apps.ready = False
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# Clear cached data.
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opts.__dict__.pop('fields_map', None)
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try:
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# 'data_abstract' is a forward field, and therefore will be found
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self.assertTrue(opts.get_field('data_abstract'))
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msg = (
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"Person has no field named 'some_missing_field'. The app "
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"cache isn't ready yet, so if this is an auto-created related "
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"field, it might not be available yet."
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)
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with self.assertRaisesMessage(FieldDoesNotExist, msg):
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opts.get_field('some_missing_field')
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# Be sure it's not cached
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self.assertNotIn('fields_map', opts.__dict__)
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finally:
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opts.apps.ready = True
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# At this point searching a related field would cache fields_map
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opts.get_field('relating_baseperson')
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self.assertIn('fields_map', opts.__dict__)
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class RelationTreeTests(TestCase):
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all_models = (Relation, AbstractPerson, BasePerson, Person, ProxyPerson, Relating)
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def setUp(self):
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apps.clear_cache()
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def test_clear_cache_clears_relation_tree(self):
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# The apps.clear_cache is setUp() should have deleted all trees.
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# Exclude abstract models that are not included in the Apps registry
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# and have no cache.
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all_models_with_cache = (m for m in self.all_models if not m._meta.abstract)
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for m in all_models_with_cache:
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self.assertNotIn('_relation_tree', m._meta.__dict__)
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def test_first_relation_tree_access_populates_all(self):
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# On first access, relation tree should have populated cache.
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self.assertTrue(self.all_models[0]._meta._relation_tree)
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# AbstractPerson does not have any relations, so relation_tree
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# should just return an EMPTY_RELATION_TREE.
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self.assertEqual(AbstractPerson._meta._relation_tree, EMPTY_RELATION_TREE)
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# All the other models should already have their relation tree
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# in the internal __dict__ .
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all_models_but_abstractperson = (m for m in self.all_models if m is not AbstractPerson)
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for m in all_models_but_abstractperson:
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self.assertIn('_relation_tree', m._meta.__dict__)
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def test_relations_related_objects(self):
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# Testing non hidden related objects
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self.assertEqual(
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sorted([field.related_query_name() for field in Relation._meta._relation_tree
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if not field.rel.field.rel.is_hidden()]),
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sorted([
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'fk_abstract_rel', 'fk_abstract_rel', 'fk_abstract_rel', 'fk_base_rel', 'fk_base_rel',
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'fk_base_rel', 'fk_concrete_rel', 'fk_concrete_rel', 'fo_abstract_rel', 'fo_abstract_rel',
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'fo_abstract_rel', 'fo_base_rel', 'fo_base_rel', 'fo_base_rel', 'fo_concrete_rel',
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'fo_concrete_rel', 'm2m_abstract_rel', 'm2m_abstract_rel', 'm2m_abstract_rel',
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'm2m_base_rel', 'm2m_base_rel', 'm2m_base_rel', 'm2m_concrete_rel', 'm2m_concrete_rel',
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])
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)
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# Testing hidden related objects
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self.assertEqual(
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sorted([field.related_query_name() for field in BasePerson._meta._relation_tree]),
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sorted([
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'+', '+', 'BasePerson_following_abstract+', 'BasePerson_following_abstract+',
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'BasePerson_following_base+', 'BasePerson_following_base+', 'BasePerson_friends_abstract+',
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'BasePerson_friends_abstract+', 'BasePerson_friends_base+', 'BasePerson_friends_base+',
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'BasePerson_m2m_abstract+', 'BasePerson_m2m_base+', 'Relating_basepeople+',
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'Relating_basepeople_hidden+', 'followers_abstract', 'followers_abstract', 'followers_abstract',
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'followers_base', 'followers_base', 'followers_base', 'friends_abstract_rel_+', 'friends_abstract_rel_+',
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'friends_abstract_rel_+', 'friends_base_rel_+', 'friends_base_rel_+', 'friends_base_rel_+', 'person',
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'person', 'relating_basepeople', 'relating_baseperson',
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])
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)
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self.assertEqual([field.related_query_name() for field in AbstractPerson._meta._relation_tree], [])
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