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0595bca221
This reverts commit 74a575eb72 as it causes
unexpected migrations and doesn't seem to be the best solution.
73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
from django.core import serializers
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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 FKDataNaturalKey, NaturalKeyAnchor
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from .tests import register_tests
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class NaturalKeySerializerTests(TestCase):
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pass
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def natural_key_serializer_test(format, self):
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# Create all the objects defined in the test data
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with connection.constraint_checks_disabled():
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objects = [
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NaturalKeyAnchor.objects.create(id=1100, data="Natural Key Anghor"),
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FKDataNaturalKey.objects.create(id=1101, data_id=1100),
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FKDataNaturalKey.objects.create(id=1102, data_id=None),
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]
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# Serialize the test database
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serialized_data = serializers.serialize(format, objects, indent=2, use_natural_foreign_keys=True)
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for obj in serializers.deserialize(format, serialized_data):
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obj.save()
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# Assert that the deserialized data is the same
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# as the original source
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for obj in objects:
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instance = obj.__class__.objects.get(id=obj.pk)
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self.assertEqual(
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obj.data, instance.data,
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"Objects with PK=%d not equal; expected '%s' (%s), got '%s' (%s)" % (
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obj.pk, obj.data, type(obj.data), instance, type(instance.data),
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)
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)
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def natural_key_test(format, self):
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book1 = {
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'data': '978-1590597255',
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'title': 'The Definitive Guide to Django: Web Development Done Right',
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}
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book2 = {'data': '978-1590599969', 'title': 'Practical Django Projects'}
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# Create the books.
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adrian = NaturalKeyAnchor.objects.create(**book1)
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james = NaturalKeyAnchor.objects.create(**book2)
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# Serialize the books.
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string_data = serializers.serialize(
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format, NaturalKeyAnchor.objects.all(), indent=2,
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use_natural_foreign_keys=True, use_natural_primary_keys=True,
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)
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# Delete one book (to prove that the natural key generation will only
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# restore the primary keys of books found in the database via the
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# get_natural_key manager method).
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james.delete()
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# Deserialize and test.
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books = list(serializers.deserialize(format, string_data))
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self.assertEqual(len(books), 2)
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self.assertEqual(books[0].object.title, book1['title'])
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self.assertEqual(books[0].object.pk, adrian.pk)
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self.assertEqual(books[1].object.title, book2['title'])
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self.assertIsNone(books[1].object.pk)
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# Dynamically register tests for each serializer
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register_tests(NaturalKeySerializerTests, 'test_%s_natural_key_serializer', natural_key_serializer_test)
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register_tests(NaturalKeySerializerTests, 'test_%s_serializer_natural_keys', natural_key_test)
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