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209 lines
8.6 KiB
Python
209 lines
8.6 KiB
Python
from __future__ import unicode_literals
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from django.core.exceptions import FieldError
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from django.test import TestCase
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from .models import (
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Bookmark, Domain, Family, Genus, HybridSpecies, Kingdom, Klass, Order,
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Phylum, Pizza, Species, TaggedItem,
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)
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class SelectRelatedTests(TestCase):
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@classmethod
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def create_tree(cls, stringtree):
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"""
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Helper to create a complete tree.
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"""
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names = stringtree.split()
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models = [Domain, Kingdom, Phylum, Klass, Order, Family, Genus, Species]
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assert len(names) == len(models), (names, models)
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parent = None
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for name, model in zip(names, models):
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try:
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obj = model.objects.get(name=name)
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except model.DoesNotExist:
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obj = model(name=name)
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if parent:
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setattr(obj, parent.__class__.__name__.lower(), parent)
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obj.save()
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parent = obj
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@classmethod
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def setUpTestData(cls):
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cls.create_tree("Eukaryota Animalia Anthropoda Insecta Diptera Drosophilidae Drosophila melanogaster")
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cls.create_tree("Eukaryota Animalia Chordata Mammalia Primates Hominidae Homo sapiens")
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cls.create_tree("Eukaryota Plantae Magnoliophyta Magnoliopsida Fabales Fabaceae Pisum sativum")
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cls.create_tree("Eukaryota Fungi Basidiomycota Homobasidiomycatae Agaricales Amanitacae Amanita muscaria")
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def test_access_fks_without_select_related(self):
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"""
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Normally, accessing FKs doesn't fill in related objects
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"""
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with self.assertNumQueries(8):
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fly = Species.objects.get(name="melanogaster")
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domain = fly.genus.family.order.klass.phylum.kingdom.domain
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self.assertEqual(domain.name, 'Eukaryota')
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def test_access_fks_with_select_related(self):
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"""
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A select_related() call will fill in those related objects without any
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extra queries
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"""
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with self.assertNumQueries(1):
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person = Species.objects.select_related('genus__family__order__klass__phylum__kingdom__domain').get(name="sapiens")
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domain = person.genus.family.order.klass.phylum.kingdom.domain
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self.assertEqual(domain.name, 'Eukaryota')
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def test_list_without_select_related(self):
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"""
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select_related() also of course applies to entire lists, not just
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items. This test verifies the expected behavior without select_related.
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"""
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with self.assertNumQueries(9):
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world = Species.objects.all()
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families = [o.genus.family.name for o in world]
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self.assertEqual(sorted(families), [
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'Amanitacae',
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'Drosophilidae',
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'Fabaceae',
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'Hominidae',
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])
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def test_list_with_select_related(self):
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"""
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select_related() also of course applies to entire lists, not just
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items. This test verifies the expected behavior with select_related.
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"""
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with self.assertNumQueries(1):
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world = Species.objects.all().select_related()
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families = [o.genus.family.name for o in world]
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self.assertEqual(sorted(families), [
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'Amanitacae',
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'Drosophilidae',
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'Fabaceae',
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'Hominidae',
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])
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def test_list_with_depth(self):
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"""
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Passing a relationship field lookup specifier to select_related() will
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stop the descent at a particular level. This can be used on lists as
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well.
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"""
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with self.assertNumQueries(5):
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world = Species.objects.all().select_related('genus__family')
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orders = [o.genus.family.order.name for o in world]
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self.assertEqual(sorted(orders),
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['Agaricales', 'Diptera', 'Fabales', 'Primates'])
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def test_select_related_with_extra(self):
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s = (Species.objects.all()
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.select_related()
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.extra(select={'a': 'select_related_species.id + 10'})[0])
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self.assertEqual(s.id + 10, s.a)
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def test_certain_fields(self):
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"""
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The optional fields passed to select_related() control which related
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models we pull in. This allows for smaller queries.
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In this case, we explicitly say to select the 'genus' and
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'genus.family' models, leading to the same number of queries as before.
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"""
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with self.assertNumQueries(1):
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world = Species.objects.select_related('genus__family')
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families = [o.genus.family.name for o in world]
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self.assertEqual(sorted(families),
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['Amanitacae', 'Drosophilidae', 'Fabaceae', 'Hominidae'])
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def test_more_certain_fields(self):
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"""
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In this case, we explicitly say to select the 'genus' and
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'genus.family' models, leading to the same number of queries as before.
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"""
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with self.assertNumQueries(2):
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world = Species.objects.filter(genus__name='Amanita')\
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.select_related('genus__family')
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orders = [o.genus.family.order.name for o in world]
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self.assertEqual(orders, ['Agaricales'])
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def test_single_related_field(self):
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with self.assertNumQueries(1):
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species = Species.objects.select_related('genus__name')
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names = [s.genus.name for s in species]
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self.assertEqual(sorted(names), ['Amanita', 'Drosophila', 'Homo', 'Pisum'])
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def test_field_traversal(self):
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with self.assertNumQueries(1):
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s = (Species.objects.all()
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.select_related('genus__family__order')
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.order_by('id')[0:1].get().genus.family.order.name)
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self.assertEqual(s, 'Diptera')
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def test_depth_fields_fails(self):
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self.assertRaises(
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TypeError,
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Species.objects.select_related,
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'genus__family__order', depth=4
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)
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def test_none_clears_list(self):
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queryset = Species.objects.select_related('genus').select_related(None)
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self.assertEqual(queryset.query.select_related, False)
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def test_chaining(self):
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parent_1, parent_2 = Species.objects.all()[:2]
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HybridSpecies.objects.create(name='hybrid', parent_1=parent_1, parent_2=parent_2)
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queryset = HybridSpecies.objects.select_related('parent_1').select_related('parent_2')
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with self.assertNumQueries(1):
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obj = queryset[0]
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self.assertEqual(obj.parent_1, parent_1)
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self.assertEqual(obj.parent_2, parent_2)
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class SelectRelatedValidationTests(TestCase):
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"""
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select_related() should thrown an error on fields that do not exist and
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non-relational fields.
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"""
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non_relational_error = "Non-relational field given in select_related: '%s'. Choices are: %s"
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invalid_error = "Invalid field name(s) given in select_related: '%s'. Choices are: %s"
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def test_non_relational_field(self):
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with self.assertRaisesMessage(FieldError, self.non_relational_error % ('name', 'genus')):
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list(Species.objects.select_related('name__some_field'))
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with self.assertRaisesMessage(FieldError, self.non_relational_error % ('name', 'genus')):
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list(Species.objects.select_related('name'))
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with self.assertRaisesMessage(FieldError, self.non_relational_error % ('name', '(none)')):
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list(Domain.objects.select_related('name'))
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def test_many_to_many_field(self):
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('toppings', '(none)')):
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list(Pizza.objects.select_related('toppings'))
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def test_reverse_relational_field(self):
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('child_1', 'genus')):
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list(Species.objects.select_related('child_1'))
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def test_invalid_field(self):
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('invalid_field', 'genus')):
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list(Species.objects.select_related('invalid_field'))
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('related_invalid_field', 'family')):
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list(Species.objects.select_related('genus__related_invalid_field'))
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('invalid_field', '(none)')):
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list(Domain.objects.select_related('invalid_field'))
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def test_generic_relations(self):
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('tags', '')):
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list(Bookmark.objects.select_related('tags'))
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with self.assertRaisesMessage(FieldError, self.invalid_error % ('content_object', 'content_type')):
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list(TaggedItem.objects.select_related('content_object'))
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