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/databases/serializers.py

@@ -30,6 +30,7 @@ from django.conf import settings
 from rest_framework import serializers
 
 from ..common.serializers import VersionableSerializer
+from ..common import fields as beat_fields
 
 from .models import Database
 from .exceptions import DatabaseCreationError
@@ -40,7 +41,7 @@ import beat.core.database
 class DatabaseSerializer(VersionableSerializer):
     protocols = serializers.SerializerMethodField()
     description = serializers.SerializerMethodField()
-    declaration = serializers.JSONField()
+    declaration = beat_fields.JSONField()
 
     class Meta(VersionableSerializer.Meta):
         model = Database
@@ -87,7 +88,7 @@ class DatabaseSerializer(VersionableSerializer):
 
 class DatabaseCreationSerializer(serializers.ModelSerializer):
     code = serializers.CharField(required=False)
-    declaration = serializers.JSONField(required=False)
+    declaration = beat_fields.JSONField(required=False)
     description = serializers.CharField(required=False, allow_blank=True)
     previous_version = serializers.CharField(required=False)
     version = serializers.IntegerField(min_value=1)