model arrayfield with float child and null True can not be serialized #3685
Description
DRF: 3.2.5
Django: 1.8
PostgreSQL: 9.4
Python: 2.7.10
os: Windows 7-x64
expected:
a model with a PostgreSQL ArrayField, base_Field models.FloatField with null=True should serialize when any item in the array field is None
observed:
the ListField child to_representation raises an exception
float() argument must be a string or a number
Basically what I think is happening is that the serializer.to_representation normally skips the field.to_representation call if the attributes value is None but it doesn't seem to have any way to handle the ListField children's attributes, which might be None. Maybe this is expected behavior? Or it is updated in DRF-3.3? Unfortunately I had trouble with base python classes, not django models in drf-3.3.
full django traceback
Environment:
Request Method: GET
Request URL: http://localhost:8000/requests/
Django Version: 1.8.5
Python Version: 2.7.10
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'simengapi_app',
'rest_framework')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware')
Traceback:
File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Python27\lib\site-packages\django\views\decorators\csrf.py" in wrapped_view
58. return view_func(*args, **kwargs)
File "C:\Python27\lib\site-packages\rest_framework\viewsets.py" in view
87. return self.dispatch(request, *args, **kwargs)
File "C:\Python27\lib\site-packages\rest_framework\views.py" in dispatch
466. response = self.handle_exception(exc)
File "C:\Python27\lib\site-packages\rest_framework\views.py" in dispatch
463. response = handler(request, *args, **kwargs)
File "C:\Python27\lib\site-packages\rest_framework\mixins.py" in list
45. return self.get_paginated_response(serializer.data)
File "C:\Python27\lib\site-packages\rest_framework\serializers.py" in data
663. ret = super(ListSerializer, self).data
File "C:\Python27\lib\site-packages\rest_framework\serializers.py" in data
228. self._data = self.to_representation(self.instance)
File "C:\Python27\lib\site-packages\rest_framework\serializers.py" in to_representation
603. self.child.to_representation(item) for item in iterable
File "C:\Python27\lib\site-packages\rest_framework\serializers.py" in to_representation
461. ret[field.field_name] = field.to_representation(attribute)
File "C:\Python27\lib\site-packages\rest_framework\fields.py" in to_representation
1450. return [self.child.to_representation(item) for item in data]
File "C:\Python27\lib\site-packages\rest_framework\fields.py" in to_representation
873. return float(value)
Exception Type: TypeError at /requests/
Exception Value: float() argument must be a string or a number
pseudocode of django model field:
efficiencyGCE = ArrayField(verbose_name='GCE Efficiency',
base_field=models.FloatField(null=True, blank=True))
and the serializer for it:
class RequestSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = Request