77 lines
3.2 KiB
Python
77 lines
3.2 KiB
Python
from unittest import skipUnless
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from django.db import connection
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from django.test import TestCase
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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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model=Article,
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column_names=("c1", "c2", "c3"),
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suffix="123",
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)
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self.assertEqual(index_name, "indexes_article_c1_7ce4cc86123")
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def test_index_together(self):
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editor = connection.schema_editor()
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index_sql = 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, ['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 = 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', "This is a mysql-specific issue")
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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 = connection.schema_editor()._model_indexes_sql(ArticleTranslation)
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self.assertEqual(index_sql, [
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'CREATE INDEX `indexes_articletranslation_99fb53c2` '
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'ON `indexes_articletranslation` (`article_no_constraint_id`)'
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])
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