from django.conf import settings from django.db import connection, models from django.test import SimpleTestCase, skipUnlessDBFeature from django.test.utils import isolate_apps from .models import Book, ChildModel1, ChildModel2 class IndexesTests(SimpleTestCase): def test_suffix(self): self.assertEqual(models.Index.suffix, 'idx') def test_repr(self): index = models.Index(fields=['title']) multi_col_index = models.Index(fields=['title', 'author']) self.assertEqual(repr(index), "") self.assertEqual(repr(multi_col_index), "") def test_eq(self): index = models.Index(fields=['title']) same_index = models.Index(fields=['title']) another_index = models.Index(fields=['title', 'author']) index.model = Book same_index.model = Book another_index.model = Book self.assertEqual(index, same_index) self.assertNotEqual(index, another_index) def test_index_fields_type(self): with self.assertRaisesMessage(ValueError, 'Index.fields must be a list.'): models.Index(fields='title') def test_raises_error_without_field(self): msg = 'At least one field is required to define an index.' with self.assertRaisesMessage(ValueError, msg): models.Index() def test_max_name_length(self): msg = 'Index names cannot be longer than 30 characters.' with self.assertRaisesMessage(ValueError, msg): models.Index(fields=['title'], name='looooooooooooong_index_name_idx') def test_name_constraints(self): msg = 'Index names cannot start with an underscore (_).' with self.assertRaisesMessage(ValueError, msg): models.Index(fields=['title'], name='_name_starting_with_underscore') msg = 'Index names cannot start with a number (0-9).' with self.assertRaisesMessage(ValueError, msg): models.Index(fields=['title'], name='5name_starting_with_number') def test_name_auto_generation(self): index = models.Index(fields=['author']) index.set_name_with_model(Book) self.assertEqual(index.name, 'model_index_author_0f5565_idx') # '-' for DESC columns should be accounted for in the index name. index = models.Index(fields=['-author']) index.set_name_with_model(Book) self.assertEqual(index.name, 'model_index_author_708765_idx') # fields may be truncated in the name. db_column is used for naming. long_field_index = models.Index(fields=['pages']) long_field_index.set_name_with_model(Book) self.assertEqual(long_field_index.name, 'model_index_page_co_69235a_idx') # suffix can't be longer than 3 characters. long_field_index.suffix = 'suff' msg = 'Index too long for multiple database support. Is self.suffix longer than 3 characters?' with self.assertRaisesMessage(AssertionError, msg): long_field_index.set_name_with_model(Book) @isolate_apps('model_indexes') def test_name_auto_generation_with_quoted_db_table(self): class QuotedDbTable(models.Model): name = models.CharField(max_length=50) class Meta: db_table = '"t_quoted"' index = models.Index(fields=['name']) index.set_name_with_model(QuotedDbTable) self.assertEqual(index.name, 't_quoted_name_e4ed1b_idx') def test_deconstruction(self): index = models.Index(fields=['title'], db_tablespace='idx_tbls') index.set_name_with_model(Book) path, args, kwargs = index.deconstruct() self.assertEqual(path, 'django.db.models.Index') self.assertEqual(args, ()) self.assertEqual( kwargs, {'fields': ['title'], 'name': 'model_index_title_196f42_idx', 'db_tablespace': 'idx_tbls'} ) def test_clone(self): index = models.Index(fields=['title']) new_index = index.clone() self.assertIsNot(index, new_index) self.assertEqual(index.fields, new_index.fields) def test_name_set(self): index_names = [index.name for index in Book._meta.indexes] self.assertCountEqual(index_names, ['model_index_title_196f42_idx', 'model_index_isbn_34f975_idx']) def test_abstract_children(self): index_names = [index.name for index in ChildModel1._meta.indexes] self.assertEqual(index_names, ['model_index_name_440998_idx']) index_names = [index.name for index in ChildModel2._meta.indexes] self.assertEqual(index_names, ['model_index_name_b6c374_idx']) @skipUnlessDBFeature('supports_tablespaces') def test_db_tablespace(self): with connection.schema_editor() as editor: # Index with db_tablespace attribute. for fields in [ # Field with db_tablespace specified on model. ['shortcut'], # Field without db_tablespace specified on model. ['author'], # Multi-column with db_tablespaces specified on model. ['shortcut', 'isbn'], # Multi-column without db_tablespace specified on model. ['title', 'author'], ]: with self.subTest(fields=fields): index = models.Index(fields=fields, db_tablespace='idx_tbls2') self.assertIn('"idx_tbls2"', str(index.create_sql(Book, editor)).lower()) # Indexes without db_tablespace attribute. for fields in [['author'], ['shortcut', 'isbn'], ['title', 'author']]: with self.subTest(fields=fields): index = models.Index(fields=fields) # The DEFAULT_INDEX_TABLESPACE setting can't be tested # because it's evaluated when the model class is defined. # As a consequence, @override_settings doesn't work. if settings.DEFAULT_INDEX_TABLESPACE: self.assertIn( '"%s"' % settings.DEFAULT_INDEX_TABLESPACE, str(index.create_sql(Book, editor)).lower() ) else: self.assertNotIn('TABLESPACE', str(index.create_sql(Book, editor))) # Field with db_tablespace specified on the model and an index # without db_tablespace. index = models.Index(fields=['shortcut']) self.assertIn('"idx_tbls"', str(index.create_sql(Book, editor)).lower())