Fix transcriptionentity create validation

arkindex/documents/api/entities.py

@@ -8,7 +8,8 @@ from arkindex.documents.serializers.entities import (
     TranscriptionEntitySerializer, TranscriptionEntityDetailsSerializer
 )
 from arkindex.documents.serializers.elements import ElementSerializer
-from rest_framework.exceptions import ValidationError
+from rest_framework import serializers
+from django.core.exceptions import ValidationError
 from arkindex.project.permissions import IsVerified
 
 
@@ -32,7 +33,7 @@ class CorpusRoles(CorpusACLMixin, ListCreateAPIView):
             child_type=data['child_type'],
             corpus_id=self.request.parser_context['kwargs']['pk']
         ).exists():
-            raise ValidationError({
+            raise serializers.ValidationError({
                 'corpus': ['Role already exists in this corpus'],
                 'id': self.request.parser_context['kwargs']['pk']
             })
@@ -101,14 +102,27 @@ class TranscriptionEntityCreate(CreateAPIView):
 
     def get_serializer_context(self):
         context = super().get_serializer_context()
-        if not self.kwargs.get('pk'):
-            # Do not raise in order to build openapi doc
+        if not self.request:
+            # OpenAPI cannot pass request context
             return context
-        tr = Transcription.objects.filter(id=self.kwargs['pk']).first()
-        if not tr or tr.element.corpus not in Corpus.objects.readable(self.request.user):
-            raise ValidationError({'transcription': ['invalid UUID or Corpus write-access is forbidden']})
+        tr = Transcription.objects.filter(
+            id=self.kwargs.get('pk'),
+            element__corpus__in=Corpus.objects.writable(self.request.user)
+        ).first()
         return {**context, 'transcription': tr}
 
+    def perform_create(self, serializer):
+        data = serializer.validated_data
+        if TranscriptionEntity.objects.filter(**data).exists():
+            raise serializers.ValidationError({
+                '__all__': ['Entity is already linked to this transcription at this position']
+            })
+        try:
+            TranscriptionEntity(**data).full_clean()
+        except ValidationError as e:
+            raise serializers.ValidationError(serializers.as_serializer_error(e))
+        super().perform_create(serializer)
+
 
 class TranscriptionEntities(ListAPIView):
     """

arkindex/documents/serializers/entities.py

 from rest_framework import serializers
-from django.core.exceptions import ValidationError as DjangoValidationError
 from arkindex.documents.models import \
     Corpus, Entity, EntityLink, EntityRole, TranscriptionEntity
 from arkindex_common.enums import EntityType
@@ -143,11 +142,10 @@ class TranscriptionEntitySerializer(serializers.ModelSerializer):
     def validate(self, data):
         data = super().validate(data)
         data['transcription'] = self.context['transcription']
-        try:
-            # Assert link is not already present in database and check clean constraints
-            TranscriptionEntity(**data).full_clean()
-        except DjangoValidationError as e:
-            raise serializers.ValidationError(serializers.as_serializer_error(e))
+        if not data['transcription']:
+            raise serializers.ValidationError({
+                'transcription': ['invalid UUID or Corpus write-access is forbidden']
+            })
         return data