old_contents: from rest_framework import serializers
  
  from social.app.models.author import Author
  
  
  class UnknownAuthorSerializer(serializers.Serializer):
      """
      Used in input cases where we don't necessarily know about a remote Author yet, so it doesn't make sense
      to use a ModelSerializer
      """
      id = serializers.URLField()
      host = serializers.URLField()
      url = serializers.URLField()
      displayName = serializers.CharField(
          required=False,
          allow_blank=True
      )
      github = serializers.URLField(
          required=False,
          allow_blank=True
      )
  
  
  class AuthorURLSerializer(serializers.ModelSerializer):
      url = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
  
      class Meta:
          model = Author
          fields = ('url',)
  
  
  class SimpleAuthorSerializer(serializers.ModelSerializer):
      id = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
      host = serializers.CharField(source='node.service_url')
      url = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
  
      class Meta:
          model = Author
          fields = ('id', 'host', 'displayName', 'url', 'github')
  
  
  class UnknownAuthorSerializer(serializers.Serializer):
      """
      Used in input cases where we don't necessarily know about a remote Author yet, so it doesn't make sense
      to use a ModelSerializer
      """
      id = serializers.URLField()
      host = serializers.URLField()
      url = serializers.URLField()
      github = serializers.URLField(
          required=False,
          allow_blank=True
      )
  
  
  class AuthorSerializer(serializers.ModelSerializer):
      id = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
      host = serializers.URLField(source='node.service_url')
      url = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
  
      friends = AuthorURLSerializer(many=True, read_only=True)
      firstName = serializers.CharField(source='user.first_name')
      lastName = serializers.CharField(source='user.last_name')
      email = serializers.CharField(source='user.email')
  
      class Meta:
          model = Author
          fields = ('id', 'host', 'displayName', 'url', 'friends', 'github', 'firstName', 'lastName', 'email', 'bio',)
  
new_contents: from rest_framework import serializers
  
  from social.app.models.author import Author
  
  
  class UnknownAuthorSerializer(serializers.Serializer):
      """
      Used in input cases where we don't necessarily know about a remote Author yet, so it doesn't make sense
      to use a ModelSerializer
      """
      id = serializers.URLField()
      host = serializers.URLField()
      url = serializers.URLField()
      displayName = serializers.CharField(
          required=False,
          allow_blank=True
      )
      github = serializers.URLField(
          required=False,
          allow_blank=True
      )
  
  
  class AuthorURLSerializer(serializers.ModelSerializer):
      url = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
  
      class Meta:
          model = Author
          fields = ('url',)
  
  
  class SimpleAuthorSerializer(serializers.ModelSerializer):
      id = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
      host = serializers.CharField(source='node.service_url')
      url = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
  
      class Meta:
          model = Author
          fields = ('id', 'host', 'displayName', 'url', 'github')
  
  
  class AuthorSerializer(serializers.ModelSerializer):
      id = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
      host = serializers.URLField(source='node.service_url')
      url = serializers.HyperlinkedIdentityField(
          view_name='service:author-detail', read_only=True, lookup_field='pk')
  
      friends = AuthorURLSerializer(many=True, read_only=True)
      firstName = serializers.CharField(source='user.first_name')
      lastName = serializers.CharField(source='user.last_name')
      email = serializers.CharField(source='user.email')
  
      class Meta:
          model = Author
          fields = ('id', 'host', 'displayName', 'url', 'friends', 'github', 'firstName', 'lastName', 'email', 'bio',)
  
subject: Remove redundant serializer