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from __future__ import absolute_import
from django.core import serializers
from django.test import TestCase
from .fields import Small
from .models import DataModel, MyModel, OtherModel
class CustomField(TestCase):
def test_defer(self):
d = DataModel.objects.create(data=[1, 2, 3])
self.assertIsInstance(d.data, list)
d = DataModel.objects.get(pk=d.pk)
self.assertIsInstance(d.data, list)
self.assertEqual(d.data, [1, 2, 3])
d = DataModel.objects.defer("data").get(pk=d.pk)
self.assertIsInstance(d.data, list)
self.assertEqual(d.data, [1, 2, 3])
# Refetch for save
d = DataModel.objects.defer("data").get(pk=d.pk)
d.save()
d = DataModel.objects.get(pk=d.pk)
self.assertIsInstance(d.data, list)
self.assertEqual(d.data, [1, 2, 3])
def test_custom_field(self):
# Creating a model with custom fields is done as per normal.
s = Small(1, 2)
self.assertEqual(str(s), "12")
m = MyModel.objects.create(name="m", data=s)
# Custom fields still have normal field's attributes.
self.assertEqual(m._meta.get_field("data").verbose_name, "small field")
# The m.data attribute has been initialised correctly. It's a Small
# object.
self.assertEqual((m.data.first, m.data.second), (1, 2))
# The data loads back from the database correctly and 'data' has the
# right type.
m1 = MyModel.objects.get(pk=m.pk)
self.assertIsInstance(m1.data, Small)
self.assertEqual(str(m1.data), "12")
# We can do normal filtering on the custom field (and will get an error
# when we use a lookup type that does not make sense).
s1 = Small(1, 3)
s2 = Small("a", "b")
self.assertQuerysetEqual(
MyModel.objects.filter(data__in=[s, s1, s2]), [
"m",
],
lambda m: m.name,
)
self.assertRaises(TypeError, lambda: MyModel.objects.filter(data__lt=s))
# Serialization works, too.
stream = serializers.serialize("json", MyModel.objects.all())
self.assertJSONEqual(stream, [{
"pk": m1.pk,
"model": "field_subclassing.mymodel",
"fields": {"data": "12", "name": "m"}
}])
obj = list(serializers.deserialize("json", stream))[0]
self.assertEqual(obj.object, m)
# Test retrieving custom field data
m.delete()
m1 = MyModel.objects.create(name="1", data=Small(1, 2))
m2 = MyModel.objects.create(name="2", data=Small(2, 3))
self.assertQuerysetEqual(
MyModel.objects.all(), [
"12",
"23",
],
lambda m: str(m.data),
ordered=False
)
def test_field_subclassing(self):
o = OtherModel.objects.create(data=Small("a", "b"))
o = OtherModel.objects.get()
self.assertEqual(o.data.first, "a")
self.assertEqual(o.data.second, "b")
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