old_contents: from rest_framework import serializers
  
  from frigg.builds.serializers import BuildInlineSerializer
  
  from .models import Project
  
  
  class ProjectSerializer(serializers.ModelSerializer):
      builds = BuildInlineSerializer(read_only=True, many=True)
  
      class Meta:
          model = Project
          fields = (
              'id',
              'owner',
              'name',
              'private',
              'approved',
              'should_clone_with_ssh',
              'builds'
          )
  
new_contents: from rest_framework import serializers
  
  from frigg.builds.serializers import BuildInlineSerializer
  
  from .models import Project
  
  
  class EnvironmentVariableSerializer(serializers.ModelSerializer):
  
      def to_representation(self, instance):
          representation = super().to_representation(instance)
          if instance.is_secret:
              representation.value = '[secret]'
          return representation
  
      class Meta:
          model = Project
          fields = (
              'id',
              'key',
              'is_secret',
              'value',
          )
  
  
  class ProjectSerializer(serializers.ModelSerializer):
      builds = BuildInlineSerializer(read_only=True, many=True)
  
      class Meta:
          model = Project
          fields = (
              'id',
              'owner',
              'name',
              'private',
              'approved',
              'should_clone_with_ssh',
              'builds'
          )
  
subject: Add drf serializer for environment variables