Hey all! We recently discovered "rounding" for the DecimalField type
(DecimalField
API <http://www.django-rest-framework.org/api-guide/fields/#decimalfield>)
and thought it was a perfect option to use for rounding latitude and
longitude fields that may have varying lengths. After multiple
implementation attempts, we can't quite get it to work right. It seems that
the model validations are firing before the rounding can take place on the
serializer.
This is my first post to this group, so I'm not sure what level of detail I
should include. That being said, I'll be verbose =)
Any help would be greatly appreciated!
Thanks,
Andy
Serializer
class AddressSerializer(BaseCreateSerializer):
id = serializers.UUIDField(read_only=True)
latitude = serializers.DecimalField(max_digits=8, decimal_places=5,
rounding=ROUND_DOWN)
longitude = serializers.DecimalField(max_digits=8, decimal_places=5,
rounding=ROUND_DOWN)
class Meta:
model = Address
fields = ('id', 'label', 'name', 'locality', 'region',
'country', 'postalcode', 'latitude', 'longitude')
Model
class Address(BaseContactModel):
"""
Not every field is required to be a valid address, but at
least one "non-foreign-key" field must be populated.
ForeignKey Reqs: either the `location` or `person` FK must be
populated, but not both.
"""
name = models.CharField(max_length=500, blank=True, null=True)
locality = models.CharField(max_length=50)
region = models.CharField(max_length=50)
region_a = models.CharField(max_length=12)
postalcode = models.CharField(max_length=12, blank=True, null=True)
country = models.CharField(max_length=55)
country_a = models.CharField(max_length=3, default="US")
latitude = models.DecimalField(decimal_places=5, max_digits=8)
longitude = models.DecimalField(decimal_places=5, max_digits=8)
label = models.CharField(max_length=700)
def __str__(self):
return "id: {}; name: {}; locality: {}; region: {}; country:
{}".format(
self.id, self.name, self.locality, self.region,
self.country)
Test
class AddressTests(APITestCase):
def setUp(self):
self.person = create_person()
self.address = create_address(self.person)
self.client.login(username=self.person.username, password=PASSWORD)
def test_truncates_latitude_longitude(self):
address = Address.objects.last()
serializer = AddressSerializer(address)
data = serializer.data
data.update({
'latitude': 123.456789101112,
'longitude': 123.456789101112,
})
response = self.client.post('/api/admin/addresses/', data,
format='json')
self.assertEqual(response.data['latitude'], 123.456789)
Test Output
======================================================================
FAIL: test_truncates_latitude_longitude
(contact.tests.test_views.AddressTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/Users/akrier/github/bsrs/bsrs-django/bigsky/contact/tests/test_views.py",
line 136, in test_truncates_latitude_longitude
self.assertEqual(response.data['latitude'], 123.456789)
AssertionError: ['Ensure that there are no more than 8 digits in total.']
!= 123.456789
----------------------------------------------------------------------
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