mirror of https://github.com/django/django.git
126 lines
5.5 KiB
Python
126 lines
5.5 KiB
Python
from unittest import skipUnless
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from django.db import connection
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from django.db.models.deletion import CASCADE
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from django.db.models.fields.related import ForeignKey
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from django.test import TestCase, TransactionTestCase
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from .models import Article, ArticleTranslation, IndexTogetherSingleList
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class SchemaIndexesTests(TestCase):
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"""
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Test index handling by the db.backends.schema infrastructure.
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"""
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def test_index_name_hash(self):
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"""
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Index names should be deterministic.
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"""
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with connection.schema_editor() as editor:
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index_name = editor._create_index_name(
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table_name=Article._meta.db_table,
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column_names=("c1",),
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suffix="123",
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)
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self.assertEqual(index_name, "indexes_article_c1_a52bd80b123")
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def test_index_name(self):
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"""
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Index names on the built-in database backends::
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* Are truncated as needed.
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* Include all the column names.
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* Include a deterministic hash.
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"""
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long_name = 'l%sng' % ('o' * 100)
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with connection.schema_editor() as editor:
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index_name = editor._create_index_name(
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table_name=Article._meta.db_table,
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column_names=('c1', 'c2', long_name),
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suffix='ix',
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)
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expected = {
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'mysql': 'indexes_article_c1_c2_looooooooooooooooooo_255179b2ix',
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'oracle': 'indexes_a_c1_c2_loo_255179b2ix',
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'postgresql': 'indexes_article_c1_c2_loooooooooooooooooo_255179b2ix',
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'sqlite': 'indexes_article_c1_c2_l%sng_255179b2ix' % ('o' * 100),
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}
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if connection.vendor not in expected:
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self.skipTest('This test is only supported on the built-in database backends.')
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self.assertEqual(index_name, expected[connection.vendor])
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def test_index_together(self):
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editor = connection.schema_editor()
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index_sql = [str(statement) for statement in editor._model_indexes_sql(Article)]
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self.assertEqual(len(index_sql), 1)
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# Ensure the index name is properly quoted
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self.assertIn(
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connection.ops.quote_name(
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editor._create_index_name(Article._meta.db_table, ['headline', 'pub_date'], suffix='_idx')
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),
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index_sql[0]
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)
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def test_index_together_single_list(self):
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# Test for using index_together with a single list (#22172)
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index_sql = connection.schema_editor()._model_indexes_sql(IndexTogetherSingleList)
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self.assertEqual(len(index_sql), 1)
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@skipUnless(connection.vendor == 'postgresql', "This is a postgresql-specific issue")
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def test_postgresql_text_indexes(self):
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"""Test creation of PostgreSQL-specific text indexes (#12234)"""
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from .models import IndexedArticle
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index_sql = [str(statement) for statement in connection.schema_editor()._model_indexes_sql(IndexedArticle)]
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self.assertEqual(len(index_sql), 5)
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self.assertIn('("headline" varchar_pattern_ops)', index_sql[1])
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self.assertIn('("body" text_pattern_ops)', index_sql[3])
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# unique=True and db_index=True should only create the varchar-specific
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# index (#19441).
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self.assertIn('("slug" varchar_pattern_ops)', index_sql[4])
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@skipUnless(connection.vendor == 'postgresql', "This is a postgresql-specific issue")
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def test_postgresql_virtual_relation_indexes(self):
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"""Test indexes are not created for related objects"""
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index_sql = connection.schema_editor()._model_indexes_sql(Article)
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self.assertEqual(len(index_sql), 1)
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@skipUnless(connection.vendor == 'mysql', 'MySQL tests')
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class SchemaIndexesMySQLTests(TransactionTestCase):
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available_apps = ['indexes']
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def test_no_index_for_foreignkey(self):
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"""
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MySQL on InnoDB already creates indexes automatically for foreign keys.
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(#14180). An index should be created if db_constraint=False (#26171).
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"""
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storage = connection.introspection.get_storage_engine(
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connection.cursor(), ArticleTranslation._meta.db_table
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)
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if storage != "InnoDB":
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self.skip("This test only applies to the InnoDB storage engine")
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index_sql = [str(statement) for statement in connection.schema_editor()._model_indexes_sql(ArticleTranslation)]
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self.assertEqual(index_sql, [
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'CREATE INDEX `indexes_articletranslation_article_no_constraint_id_d6c0806b` '
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'ON `indexes_articletranslation` (`article_no_constraint_id`)'
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])
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# The index also shouldn't be created if the ForeignKey is added after
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# the model was created.
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field_created = False
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try:
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with connection.schema_editor() as editor:
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new_field = ForeignKey(Article, CASCADE)
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new_field.set_attributes_from_name('new_foreign_key')
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editor.add_field(ArticleTranslation, new_field)
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field_created = True
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self.assertEqual([str(statement) for statement in editor.deferred_sql], [
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'ALTER TABLE `indexes_articletranslation` '
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'ADD CONSTRAINT `indexes_articletrans_new_foreign_key_id_d27a9146_fk_indexes_a` '
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'FOREIGN KEY (`new_foreign_key_id`) REFERENCES `indexes_article` (`id`)'
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])
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finally:
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if field_created:
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with connection.schema_editor() as editor:
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editor.remove_field(ArticleTranslation, new_field)
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