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from __future__ import unicode_literals
import inspect
from django.core import exceptions, serializers
from django.db import connection
from django.test import TestCase
from .fields import Small, CustomTypedField
from .models import ChoicesModel, 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 initialized 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))
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")
def test_subfieldbase_plays_nice_with_module_inspect(self):
"""
Custom fields should play nice with python standard module inspect.
http://users.rcn.com/python/download/Descriptor.htm#properties
"""
# Even when looking for totally different properties, SubfieldBase's
# non property like behavior made inspect crash. Refs #12568.
data = dict(inspect.getmembers(MyModel))
self.assertIn('__module__', data)
self.assertEqual(data['__module__'], 'field_subclassing.models')
def test_validation_of_choices_for_custom_field(self):
# a valid choice
o = ChoicesModel.objects.create(data=Small('a', 'b'))
o.full_clean()
# an invalid choice
o = ChoicesModel.objects.create(data=Small('d', 'e'))
with self.assertRaises(exceptions.ValidationError):
o.full_clean()
class TestDbType(TestCase):
def test_db_parameters_respects_db_type(self):
f = CustomTypedField()
self.assertEqual(f.db_parameters(connection)['type'], 'custom_field')
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