class ProductImageSerializer(serializers.ModelSerializer):                      
    1     violated = serializers.SerializerMethodField()                              
    2                                                                                 
    3     def get_violated(self, obj):                                                
    4         return obj.found_copyright_violations.exists()  # if there are violations
    5                                                                                 
    6     class Meta:                                                                 
    7         model = ProductImage                                                    
    8         fields = ('product', 'image_id', 'url', 'selected', 'violated')         
    9         # otherwise, there will be validation errors                            
   10         extra_kwargs = {"image_id": {"validators": []}}                         
   11                                                                                 
   12                                                                                 
   13 class ProductSerializer(serializers.ModelSerializer):                           
   14     images = ProductImageSerializer(many=True)                                  
   15                                                                                 
   16     class Meta:                                                                 
   17         model = Product                                                         
   18         fields = ('product_id', 'title', 'images', 'active')                    
   19                                                                                 
   20     def update(self, instance, validated_data):                                 
   21         # Updating images selected field                                        
   22         for image_data in validated_data.get("images"):                         
>> 23             image_instance = ProductImage.objects.get(                          
   24                 pk=image_data.get("image_id"),                                  
   25             )                                                                   
   26                                                                                 
   27             image_instance.selected = image_data.get("selected")                
   28             image_instance.save()                                               
   29                                                                                 
   30         selected_images = instance.images.filter(selected=True)                 
   31                                                                                 
   32         # If there are selected images, set to either true or false.            
   33         if selected_images:                                                     
   34             instance.active = validated_data.get('active', instance.active)     
   35         # Otherwise false                                                       
   36         else:                                                                   
   37             instance.active = False                                             
   38                                                                                 
   39         instance.save()                                                         
   40                                                                                 
   41         return instance