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a8a81aae20
Generic cleanup and dead code removal in deferred model field loading and model.__reduce__(). Also fixed an issue where if an inherited model with a parent field chain parent_ptr_id -> id would be deferred loaded, then accessing the id field caused caused a database query, even if the id field's value is already loaded in the parent_ptr_id field.
88 lines
3.0 KiB
Python
88 lines
3.0 KiB
Python
from __future__ import absolute_import
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from django.core import serializers
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from django.test import TestCase
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from .fields import Small
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from .models import DataModel, MyModel, OtherModel
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class CustomField(TestCase):
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def test_defer(self):
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d = DataModel.objects.create(data=[1, 2, 3])
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self.assertTrue(isinstance(d.data, list))
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d = DataModel.objects.get(pk=d.pk)
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self.assertTrue(isinstance(d.data, list))
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self.assertEqual(d.data, [1, 2, 3])
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d = DataModel.objects.defer("data").get(pk=d.pk)
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self.assertTrue(isinstance(d.data, list))
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self.assertEqual(d.data, [1, 2, 3])
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# Refetch for save
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d = DataModel.objects.defer("data").get(pk=d.pk)
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d.save()
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d = DataModel.objects.get(pk=d.pk)
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self.assertTrue(isinstance(d.data, list))
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self.assertEqual(d.data, [1, 2, 3])
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def test_custom_field(self):
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# Creating a model with custom fields is done as per normal.
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s = Small(1, 2)
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self.assertEqual(str(s), "12")
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m = MyModel.objects.create(name="m", data=s)
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# Custom fields still have normal field's attributes.
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self.assertEqual(m._meta.get_field("data").verbose_name, "small field")
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# The m.data attribute has been initialised correctly. It's a Small
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# object.
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self.assertEqual((m.data.first, m.data.second), (1, 2))
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# The data loads back from the database correctly and 'data' has the
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# right type.
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m1 = MyModel.objects.get(pk=m.pk)
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self.assertTrue(isinstance(m1.data, Small))
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self.assertEqual(str(m1.data), "12")
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# We can do normal filtering on the custom field (and will get an error
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# when we use a lookup type that does not make sense).
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s1 = Small(1, 3)
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s2 = Small("a", "b")
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self.assertQuerysetEqual(
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MyModel.objects.filter(data__in=[s, s1, s2]), [
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"m",
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],
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lambda m: m.name,
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)
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self.assertRaises(TypeError, lambda: MyModel.objects.filter(data__lt=s))
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# Serialization works, too.
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stream = serializers.serialize("json", MyModel.objects.all())
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self.assertEqual(stream, '[{"pk": %d, "model": "field_subclassing.mymodel", "fields": {"data": "12", "name": "m"}}]' % m1.pk)
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obj = list(serializers.deserialize("json", stream))[0]
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self.assertEqual(obj.object, m)
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# Test retrieving custom field data
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m.delete()
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m1 = MyModel.objects.create(name="1", data=Small(1, 2))
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m2 = MyModel.objects.create(name="2", data=Small(2, 3))
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self.assertQuerysetEqual(
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MyModel.objects.all(), [
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"12",
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"23",
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],
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lambda m: str(m.data)
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)
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def test_field_subclassing(self):
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o = OtherModel.objects.create(data=Small("a", "b"))
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o = OtherModel.objects.get()
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self.assertEqual(o.data.first, "a")
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self.assertEqual(o.data.second, "b")
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