🐛 [#576] fix invalid data field type in api spec

[Floris272]

Fixes #576

Changes

• Overrides the serializer_field_mapping for models.JSONField

• inspired/copied from rest-framework-gis

• rest-framework-gis is also the reason that setting the mapping in a mixin is not possible:

class JsonObjectFieldModelSerializerMixin:
    serializer_field_mapping = (
        serializers.ModelSerializer.serializer_field_mapping.copy()
    )
    serializer_field_mapping[models.JSONField] = JSONObjectField

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.69%. Comparing base (1dcce4a) to head (deb305f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #584   +/-   ##
=======================================
  Coverage   94.68%   94.69%           
=======================================
  Files         147      148    +1     
  Lines        5133     5142    +9     
=======================================
+ Hits         4860     4869    +9     
  Misses        273      273           

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