Refactor update creation api

This merge request does the following:

• Raise DRF errors rather than returning response to take advantage of the DRF exception handling mechanism
• Create serialisers for PUT request to simplify the code
• Improve validation checks in several places
• Fixes several issues in DRF infrastructure uses
• Fixes JSON fields handling
• Remove routes that do no fully qualify objects
• Implement a custom DRF exception handler that will allow to log errors
• Improve testing
• Improve permission management

beat/web/common/serializers.py

@@ -422,7 +422,7 @@ class ContributionCreationSerializer(ContributionModSerializer):
 
         if previous_version is not None:
             try:
-                previous_object = annotate_full_name(self.Meta.model).get(
+                previous_object = annotate_full_name(self.Meta.model.objects).get(
                     full_name=previous_version
                 )
             except self.Meta.model.DoesNotExist:
@@ -449,7 +449,7 @@ class ContributionCreationSerializer(ContributionModSerializer):
                 raise serializers.ValidationError("A fork starts at 1")
 
             try:
-                forked_of_object = annotate_full_name(self.Meta.model).get(
+                forked_of_object = annotate_full_name(self.Meta.model.objects).get(
                     full_name=fork_of
                 )
             except self.Meta.model.DoesNotExist: