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from django.db import transaction
from django.test import TestCase
from .models import FloatModel
class TestFloatField(TestCase):
def test_float_validates_object(self):
instance = FloatModel(size=2.5)
# Try setting float field to unsaved object
instance.size = instance
with transaction.atomic():
with self.assertRaises(TypeError):
instance.save()
# Set value to valid and save
instance.size = 2.5
instance.save()
self.assertTrue(instance.id)
# Set field to object on saved instance
instance.size = instance
msg = (
'Tried to update field model_fields.FloatModel.size with a model '
'instance, %r. Use a value compatible with FloatField.'
) % instance
with transaction.atomic():
with self.assertRaisesMessage(TypeError, msg):
instance.save()
# Try setting field to object on retrieved object
obj = FloatModel.objects.get(pk=instance.id)
obj.size = obj
with self.assertRaisesMessage(TypeError, msg):
obj.save()
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