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/accounts/serializers.py

@@ -25,20 +25,13 @@
 #                                                                             #
 ###############################################################################
 
-from django.contrib.auth.models import User, AnonymousUser
-
+from django.contrib.auth.models import User
 from rest_framework import serializers
 
-from .models import Profile, SupervisionTrack
-from ..common.models import Contribution
-from ..common.fields import JSONSerializerField
-from ..ui.templatetags.markup import restructuredtext
-from ..common.utils import validate_restructuredtext
-
-import simplejson as json
+from .models import SupervisionTrack
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class UserSerializer(serializers.ModelSerializer):
@@ -47,7 +40,7 @@ class UserSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = User
-        fields = ['username', 'email']
+        fields = ["username", "email"]
 
     def get_username(self, obj):
         return obj.username
@@ -56,7 +49,7 @@ class UserSerializer(serializers.ModelSerializer):
         return obj.email
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class BasicSupervisionTrackSerializer(serializers.ModelSerializer):
@@ -70,12 +63,12 @@ class BasicSupervisionTrackSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = SupervisionTrack
-        fields = ['is_valid']
+        fields = ["is_valid"]
 
-    #def get_supervisee(self, obj):
+    # def get_supervisee(self, obj):
     #    return obj.supervisee
 
-    #def get_supervisor(self, obj):
+    # def get_supervisor(self, obj):
     #    return obj.supervisor
 
     def get_is_valid(self, obj):
@@ -94,20 +87,27 @@ class BasicSupervisionTrackSerializer(serializers.ModelSerializer):
         return obj.supervision_key
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class FullSupervisionTrackSerializer(BasicSupervisionTrackSerializer):
-
     class Meta(BasicSupervisionTrackSerializer.Meta):
-        fields = ['supervisee', 'supervisor', 'is_valid', 'start_date', 'expiration_date','last_validation_date', 'supervision_key']
+        fields = [
+            "supervisee",
+            "supervisor",
+            "is_valid",
+            "start_date",
+            "expiration_date",
+            "last_validation_date",
+            "supervision_key",
+        ]
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class SupervisionTrackUpdateSerializer(BasicSupervisionTrackSerializer):
     pass
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------