old_contents: from rest_framework import serializers
  
  from .models import ResaleApartment, ResaleApartmentImage
  
  
  class ResaleApartmentImageSerializer(serializers.ModelSerializer):
      class Meta:
          model = ResaleApartmentImage
          fields = '__all__'
  
  
  class ResaleApartmentSerializer(serializers.ModelSerializer):
      # images = ResaleApartmentImageSerializer(source='photos', many=True)
      get_building_type_display = serializers.ReadOnlyField()
      price_per_square_meter = serializers.ReadOnlyField()
      neighbourhood = serializers.StringRelatedField()
  
      class Meta:
          model = ResaleApartment
          fields = (
              'total_area',
              'address',
              'floor',
              'number_of_storeys',
              # 'images',
              'full_price',
              'old_price',
              'price_per_square_meter',
              'neighbourhood',
              'get_building_type_display',
              'number_of_storeys',
              'date_of_construction',
              'celling_height',
              'decoration',
              'kitchen_area',
              'balcony_area',
              'id',
          )
  
new_contents: from rest_framework import serializers
  
  from .models import ResaleApartment, ResaleApartmentImage
  
  
  class ResaleApartmentImageSerializer(serializers.ModelSerializer):
      class Meta:
          model = ResaleApartmentImage
          fields = '__all__'
  
  
  class ResaleApartmentSerializer(serializers.ModelSerializer):
      # images = ResaleApartmentImageSerializer(source='photos', many=True)
      get_building_type_display = serializers.ReadOnlyField()
      price_per_square_meter = serializers.ReadOnlyField()
      neighbourhood = serializers.StringRelatedField()
      decoration = serializers.ReadOnlyField(source='decoration.name')
  
      class Meta:
          model = ResaleApartment
          fields = (
              'total_area',
              'address',
              'floor',
              'number_of_storeys',
              # 'images',
              'full_price',
              'old_price',
              'price_per_square_meter',
              'neighbourhood',
              'get_building_type_display',
              'number_of_storeys',
              'date_of_construction',
              'celling_height',
              'decoration',
              'kitchen_area',
              'balcony_area',
              'id',
          )
  
subject: Make ResaleApartmentSerializer return Decoration.name on decoration field.