Recursive serializer

[matthieu...@gmail.com]

Hi,

I'm trying to create a recursive serializer because my app is front first and I store complete objects in indexeddb.

So when I try to sync it's a pain to overwrite .create() and .update() method for every nested serializer

A simple object for example (each serializer can have nested serializer too, until more than 5 levels) :

class ClientfileSerializer(NestedStructureSerializer):

  building         = BuildingSerializer() 

  order_giver    = ContactSerializer(required=False)                            # ForeignKey

  quote            = QuoteSerializer(required=False)

  invoice          = InvoiceSerializer(required=False, allow_null=True)    # OneToOne related

  prestations    = PrestationSerializer(required=False, many=True)      # ManyToMany

  history_items = HistoryItemSerializer(required=False, many=True)   # ForeignKey related

  class Meta:

    model  = Clientfile

    fields = (

      'number',

      'token',

      'order_giver',

      'building',

      'prestations',

      'quote',

      'invoice',

      'history_items',

    )

I have a lot of questions but the main is : How to know the relationship of my nested serializer ?

Currently, I defined it in the serializer context but it's a bit dirty...

class NestedStructureSerializer(serializers.ModelSerializer):

    def update(self, instance, validated_data):

        instance_changed = False

        for field_name, field_instance in self.get_fields().items():

          if not field_instance.read_only and field_name in validated_data:

            field_context = field_instance.context if hasattr(field_instance, 'context') else {}

            field_type = field_context['type'] if ('type' in field_context) else None

            if isinstance(field_instance, serializers.ListSerializer): # many=True result in ListSerializer

              if field_type == 'ManyToMany':

                # Process ManyTomany update

              else:

                # Process ForeignKey related update

[matthieu...@gmail.com]

Answer to myself, you can acces to the _meta API and get the Model's field that you want

for field_name, field_instance in self.get_fields().items():

    model_field = self.Meta.model._meta.get_field(field_name)

    

    if model_field.many_to_many: ....