from django.db import models from django.test import TestCase from .models import Book class IndexesTests(TestCase): 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_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) def test_deconstruction(self): index = models.Index(fields=['title']) 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'})