new_contents: from rest_framework import serializers
  
  from common.serializers import AbstractFieldsMixin
  
  from .models import (
      CommunityHealthUnit,
      CommunityHealthWorker,
      CommunityHealthWorkerContact
  )
  
  
  class CommunityHealthUnitSerializer(
          AbstractFieldsMixin, serializers.ModelSerializer):
      class Meta:
          model = CommunityHealthUnit
  
  
  class CommunityHealthWorkerSerializer(
          AbstractFieldsMixin, serializers.ModelSerializer):
      class Meta:
          model = CommunityHealthWorker
  
  
  class CommunityHealthWorkerContactSerializer(
          AbstractFieldsMixin, serializers.ModelSerializer):
      class Meta:
          model = CommunityHealthWorkerContact
  
  
subject: Add chul model serializers.