Drf-yasg: Field with callable default value generates an invalid schema

[tiltec]

Hi @axnsan12, cool project! I tried it out in https://github.com/yunity/karrot-backend and stumbled upon this error:

TypeError: Object of type 'CurrentUserDefault' is not JSON serializable
(full stacktrace)

One of our serializers uses DRFs CurrentUserDefault like this:

class FeedbackSerializer(serializers.ModelSerializer):
    class Meta:
        model = FeedbackModel
        fields = ['given_by']
        extra_kwargs = {'given_by': {'default': serializers.CurrentUserDefault()}}

When enabling validation, flex throws this error:

flex.exceptions.ValidationError: 'definitions':
    - 'Feedback':
        - 'properties':
            - 'properties':
                - 'given_by':
                    - 'default':
                        - "The value of `default` must be of one of the declared types for the schema. `CurrentUserDefault()` is not one of `['string']`"
    - 'User':
        - 'default':
            - "The value of `default` must be of one of the declared types for the schema. `CurrentUserDefault()` is not one of `['object']`"

Is it feasible to add support for CurrentUserDefault into drf-yasg?

[tiltec]

Oh, just noticed #24, so I'll close this issue again.

[axnsan12]

If it does throw an error then this issue does indeed need to be handled. As said in #24, it cannot be handled by making it work, but one would at least expect it to not crash and just not populate the default value.

I'll look into it.

[axnsan12]

Fixed and pushed 1.0.6.

Can you check if that works for your case?

[tiltec]

It works great ✨ Thank you!