update news_gallery model

apps/news/serializers.py

@@ -243,6 +243,15 @@ class NewsBackOfficeGallerySerializer(serializers.ModelSerializer):
         """Get url kwargs from request."""
         return self.context.get('request').parser_context.get('kwargs')
 
+    def create(self, validated_data):
+        news_pk = self.get_request_kwargs().get('pk')
+        image_id = self.get_request_kwargs().get('image_id')
+        news_gallery_model = models.NewsGallery.objects.filter(image_id=image_id, news_id=news_pk).first()
+        if news_gallery_model:
+            news_gallery_model.update(**validated_data)
+            return news_gallery_model
+        return super().create(validated_data)
+
     def validate(self, attrs):
         """Override validate method."""
         news_pk = self.get_request_kwargs().get('pk')