old_contents: from rest_framework import serializers
  
  from .models import (ChallengeHost,
                       ChallengeHostTeam,)
  
  
  class ChallengeHostTeamSerializer(serializers.ModelSerializer):
  
      def __init__(self, *args, **kwargs):
          super(ChallengeHostTeamSerializer, self).__init__(*args, **kwargs)
          context = kwargs.get('context')
          if context:
              request = context.get('request')
              kwargs['data']['created_by'] = request.user.pk
  
      class Meta:
          model = ChallengeHostTeam
          fields = ('id', 'team_name', 'created_by',)
  
  
  class ChallengeHostSerializer(serializers.ModelSerializer):
  
      status = serializers.ChoiceField(choices=ChallengeHost.STATUS_OPTIONS)
      permissions = serializers.ChoiceField(choices=ChallengeHost.PERMISSION_OPTIONS)
  
      def __init__(self, *args, **kwargs):
          super(ChallengeHostSerializer, self).__init__(*args, **kwargs)
          context = kwargs.get('context')
          if context:
              challenge_host_team = context.get('challenge_host_team')
              request = context.get('request')
              kwargs['data']['team_name'] = challenge_host_team.pk
              kwargs['data']['user'] = request.user.pk
  
      class Meta:
          model = ChallengeHost
          fields = ('id', 'user', 'team_name', 'status', 'permissions',)
  
new_contents: from django.contrib.auth.models import User
  
  from rest_framework import serializers
  
  from .models import (ChallengeHost,
                       ChallengeHostTeam,)
  
  
  class ChallengeHostTeamSerializer(serializers.ModelSerializer):
  
      def __init__(self, *args, **kwargs):
          super(ChallengeHostTeamSerializer, self).__init__(*args, **kwargs)
          context = kwargs.get('context')
          if context:
              request = context.get('request')
              kwargs['data']['created_by'] = request.user.pk
  
      class Meta:
          model = ChallengeHostTeam
          fields = ('id', 'team_name', 'created_by',)
  
  
  class ChallengeHostSerializer(serializers.ModelSerializer):
  
      status = serializers.ChoiceField(choices=ChallengeHost.STATUS_OPTIONS)
      permissions = serializers.ChoiceField(choices=ChallengeHost.PERMISSION_OPTIONS)
      user = serializers.SlugRelatedField(slug_field='username', queryset=User.objects.all())
  
      def __init__(self, *args, **kwargs):
          super(ChallengeHostSerializer, self).__init__(*args, **kwargs)
          context = kwargs.get('context')
          if context:
              challenge_host_team = context.get('challenge_host_team')
              request = context.get('request')
              kwargs['data']['team_name'] = challenge_host_team.pk
              kwargs['data']['user'] = request.user.username
  
      class Meta:
          model = ChallengeHost
          fields = ('id', 'user', 'team_name', 'status', 'permissions',)
  
subject: Update ChallengeHost Serializer to return username instead of user id. (#153)