drf-flex-fields

import os from django.db import models from rest_framework import serializers, viewsets from rest_flex_fields import FlexFieldsModelSerializer from rest_flex_fields.views import FlexFieldsMixin # Minimal Django setup for demonstration os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings') # Define a simple Django model (e.g., in models.py) class Country(models.Model): name = models.CharField(max_length=100) population = models.IntegerField() def __str__(self): return self.name class State(models.Model): name = models.CharField(max_length=100) country = models.ForeignKey(Country, related_name='states', on_delete=models.CASCADE) def __str__(self): return self.name # Define FlexFields serializers class StateSerializer(FlexFieldsModelSerializer): class Meta: model = State fields = ('id', 'name') class CountrySerializer(FlexFieldsModelSerializer): class Meta: model = Country fields = ('id', 'name', 'population', 'states') expandable_fields = { 'states': (StateSerializer, {'many': True}) } # Define a ViewSet using FlexFieldsMixin class CountryViewSet(FlexFieldsMixin, viewsets.ModelViewSet): queryset = Country.objects.all() serializer_class = CountrySerializer # Allow 'states' to be expanded on list views (GET /countries/) permit_list_expands = ['states'] # Example usage (conceptual, in a Django/DRF app context): # GET /countries/1/?expand=states # GET /countries/?fields=id,name