python - Django Rest Framework filtering a many to many field -

i filter serialization of many many field, don't need create view or generic view explained here because need use data in view.

the code pretty simple. locations in model si manytomany field.

class serviceserializer(serializers.modelserializer):     locations = locationserializer(many=true)     # [...]     class meta:         model = service 

and locationserializer is:

class locationserializer(serializers.modelserializer):     # [...]     class meta:         model = locationaddress         # [...] 

i locations serialized based on boolean field in model. active=true. how can that?

if not need locations field within serializer writable, may benefit dropping serializermethodfield. other option dynamically remove locations field when serializing individual object, create inconsistent output if multiple objects returned not have same active flag.

to serializermethodfield, add new method on serviceserializer.

class serviceserializer(serializers.modelserializer):     locations = serializermethodfield("get_locations")     # [...]     class meta:         model = service      def get_locations(self, obj):         if obj.active:             return locationserializer(obj.locations.all(), many=true)          return none 

this make locations read-only, may not hoping for. means locations return null when it's not active, , may have been looking remove key entirely.

the other option drop key entirely in to_representation (to_native in drf 2.x) method.

class serviceserializer(serializers.modelserializer):     locations = locationserializer(many=true)     # [...]     class meta:         model = service      def to_representation(self, obj):         rep = super(serviceserializer, self).to_representation(obj)          del rep["locations"]          return rep