Hi, I'm having an issue with the ValidationError, and I think I must be
doing something wrong.
I'm using a Django management command to retrieve survey data from
Qualtrics API, and DRF to convert the JSON into Django objects that then
get saved in the database. The Qualtrics JSON is very different from the
db schema / Django structure into which I am importing the data, so I'm not
using a fair amount of the DRF functionality. However, it has helped me
structure things in a familiar way.
This is all working pretty nicely. However, in the case when I raise an
exception in the Question.to_internal_value() method, I'm getting a
ValueError from inside the Collections package (via ReturnDict and
Serializer.is_valid()).
Here is a simplified version of the code, and the traceback. Why is the
ValidationError causing an exception?
Any help very much appreciated!
In the management command:
serializer = SurveySerializer(data=survey_data)
serializer.is_valid(raise_exception=True)
In serializers.py:
class SurveySerializer(serializers.Serializer):
def to_internal_value(self, data):
# lots of code...
serializer = ModuleSerializer(data=data)
if serializer.is_valid(raise_exception=True):
output['module_serializer'] = serializer
else:
raise serializers.ValidationError(
"ModuleSerializer invalid: {}".format(serializer.errors))
# Create the questions, attached to our new Module. We are passing
the
# entire survey data and letting the QuestionSerializer pick out
and order
# the questions.
serializer = QuestionSerializer(data=data, many=True)
if serializer.is_valid(raise_exception=True):
output['question_serializer'] = serializer
else:
raise serializers.ValidationError("QuestionSerializer invalid")
# ...
return output
class QuestionSerializer(serializers.Serializer):
def to_internal_value(self, data):
raise serializers.ValidationError('Slider not implemented')
# ....
return output
class ModuleSerializer(serializers.Serializer):
def to_internal_value(self, data):
return dict(name=data['name'] + ' Module')
When the ValidationError is raised in
QuestionSerializer.to_internal_value() I get the following traceback:
Traceback (most recent call last):
File "./manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/django/core/management/__init__.py",
line 353, in execute_from_command_line
utility.execute()
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/django/core/management/__init__.py",
line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/django/core/management/base.py",
line 348, in run_from_argv
self.execute(*args, **cmd_options)
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/django/core/management/base.py",
line 399, in execute
output = self.handle(*args, **options)
File
"/home/liam/Environments/cbe/cbe_survey/surveys/management/commands/qualtrics.py",
line 248, in handle
if serializer.is_valid(raise_exception=True):
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/rest_framework/serializers.py",
line 249, in is_valid
raise ValidationError(self.errors)
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/rest_framework/serializers.py",
line 547, in errors
return ReturnDict(ret, serializer=self)
File
"/home/liam/.virtualenvs/cbe/local/lib/python2.7/site-packages/rest_framework/utils/serializer_helpers.py",
line 22, in __init__
super(ReturnDict, self).__init__(*args, **kwargs)
File "/usr/lib/python2.7/collections.py", line 69, in __init__
self.__update(*args, **kwds)
File "/home/liam/.virtualenvs/cbe/lib/python2.7/_abcoll.py", line 571, in
update
for key, value in other:
ValueError: need more than 0 values to unpack
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