old_contents: from django.contrib.auth.models import User
  from rest_framework import serializers
  from .models import FeedSource, Label, FeedSourceLabel
  
  
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ('url', 'username', 'email')
  
  class FeedSourceSerializer(serializers.HyperlinkedModelSerializer):
      user = serializers.ReadOnlyField(source='user.username')
  
      class Meta:
          model = FeedSource
          fields = ('url', 'id', 'sourceUrl', 'name', 'user')
  
  class LabelSerializer(serializers.HyperlinkedModelSerializer):
      user = serializers.ReadOnlyField(source='user.username')
      feedSources = FeedSourceSerializer(many = True, read_only = True)
  
  
      class Meta:
          model = Label
          fields = ('url', 'id', 'name', 'feedSources', 'user')
  
  
  class FeedSourceLabelSerializer(serializers.Serializer):
  
      # def __init__(self, *args, **kwargs):
      #     many = kwargs.pop('many', True)
      #     super(FeedSourceLabelSerializer, self).__init__(many=many, *args, **kwargs)
  
      # feedSource = serializers.HyperlinkedRelatedField(view_name="feedsource-detail", queryset = FeedSource.objects.all())
      label = serializers.HyperlinkedRelatedField(view_name="label-detail", queryset = Label.objects.all())
      user = serializers.ReadOnlyField(source='user.username')
      # feedSources = serializers.ListField(child = serializers.HyperlinkedRelatedField(view_name='feedSource-detail', queryset = FeedSource.objects.all()))
  
      # def create(self, validated_data):
      #
  
new_contents: from django.contrib.auth.models import User
  from rest_framework import serializers
  from .models import FeedSource, Label, FeedSourceLabel
  
  
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ('url', 'username', 'email')
  
      def create(self, validated_data):
          user = User.objects.create_user(**validated_data)
          return user
  
  class FeedSourceSerializer(serializers.HyperlinkedModelSerializer):
      user = serializers.ReadOnlyField(source='user.username')
  
      class Meta:
          model = FeedSource
          fields = ('url', 'id', 'sourceUrl', 'name', 'user')
  
  class LabelSerializer(serializers.HyperlinkedModelSerializer):
      user = serializers.ReadOnlyField(source='user.username')
      feedSources = FeedSourceSerializer(many = True, read_only = True)
  
  
      class Meta:
          model = Label
          fields = ('url', 'id', 'name', 'feedSources', 'user')
  
  
  class FeedSourceLabelSerializer(serializers.Serializer):
  
      # def __init__(self, *args, **kwargs):
      #     many = kwargs.pop('many', True)
      #     super(FeedSourceLabelSerializer, self).__init__(many=many, *args, **kwargs)
  
      # feedSource = serializers.HyperlinkedRelatedField(view_name="feedsource-detail", queryset = FeedSource.objects.all())
      label = serializers.HyperlinkedRelatedField(view_name="label-detail", queryset = Label.objects.all())
      user = serializers.ReadOnlyField(source='user.username')
      # feedSources = serializers.ListField(child = serializers.HyperlinkedRelatedField(view_name='feedSource-detail', queryset = FeedSource.objects.all()))
  
      # def create(self, validated_data):
      #
  
subject: fix user api