mirror of https://github.com/django/django.git
72 lines
3.0 KiB
Python
72 lines
3.0 KiB
Python
from django.db import models
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from django.test import TestCase
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from .models import Book
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class IndexesTests(TestCase):
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def test_repr(self):
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index = models.Index(fields=['title'])
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multi_col_index = models.Index(fields=['title', 'author'])
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self.assertEqual(repr(index), "<Index: fields='title'>")
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self.assertEqual(repr(multi_col_index), "<Index: fields='title, author'>")
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def test_eq(self):
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index = models.Index(fields=['title'])
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same_index = models.Index(fields=['title'])
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another_index = models.Index(fields=['title', 'author'])
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index.model = Book
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same_index.model = Book
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another_index.model = Book
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self.assertEqual(index, same_index)
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self.assertNotEqual(index, another_index)
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def test_raises_error_without_field(self):
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msg = 'At least one field is required to define an index.'
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with self.assertRaisesMessage(ValueError, msg):
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models.Index()
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def test_max_name_length(self):
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msg = 'Index names cannot be longer than 30 characters.'
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with self.assertRaisesMessage(ValueError, msg):
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models.Index(fields=['title'], name='looooooooooooong_index_name_idx')
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def test_name_constraints(self):
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msg = 'Index names cannot start with an underscore (_).'
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with self.assertRaisesMessage(ValueError, msg):
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models.Index(fields=['title'], name='_name_starting_with_underscore')
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msg = 'Index names cannot start with a number (0-9).'
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with self.assertRaisesMessage(ValueError, msg):
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models.Index(fields=['title'], name='5name_starting_with_number')
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def test_name_auto_generation(self):
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index = models.Index(fields=['author'])
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index.set_name_with_model(Book)
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self.assertEqual(index.name, 'model_index_author_0f5565_idx')
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# '-' for DESC columns should be accounted for in the index name.
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index = models.Index(fields=['-author'])
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index.set_name_with_model(Book)
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self.assertEqual(index.name, 'model_index_author_708765_idx')
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# fields may be truncated in the name. db_column is used for naming.
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long_field_index = models.Index(fields=['pages'])
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long_field_index.set_name_with_model(Book)
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self.assertEqual(long_field_index.name, 'model_index_page_co_69235a_idx')
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# suffix can't be longer than 3 characters.
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long_field_index.suffix = 'suff'
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msg = 'Index too long for multiple database support. Is self.suffix longer than 3 characters?'
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with self.assertRaisesMessage(AssertionError, msg):
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long_field_index.set_name_with_model(Book)
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def test_deconstruction(self):
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index = models.Index(fields=['title'])
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index.set_name_with_model(Book)
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path, args, kwargs = index.deconstruct()
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self.assertEqual(path, 'django.db.models.Index')
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self.assertEqual(args, ())
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self.assertEqual(kwargs, {'fields': ['title'], 'name': 'model_index_title_196f42_idx'})
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