from goods_info.models import AttachmentModel
from rest_framework import serializers


class AttachmentsSerializer(serializers.ModelSerializer):
    """
    附件和图片的序列化器
    """
    # source 如果是字段，会显示字段，如果是方法，会执行方法，不用加括号
    # 附件或者图片的文件名
    file_name = serializers.CharField(source='a_file.name', read_only=True)

    # 附件或者图片的访问地址
    file_url = serializers.CharField(source='a_file.url', read_only=True)

    # 附件的文件类型(中文)
    type_display = serializers.CharField(source='get_a_type_display', read_only=True)

    class Meta:
        model = AttachmentModel
        fields = ['id', 'a_file', 'a_type', 'file_url', 'file_name', 'type_display']