drf 序列化外键表中的 数据

models.py

class Counties(BaseModel):
    countname = models.CharField(max_length=128,
                                 verbose_name="国家名称",
                                 null=True,
                                 blank=True)
    phoneareacode = models.IntegerField(verbose_name="电话区号",
                                        null=True,
                                        blank=True)
    code = models.IntegerField(verbose_name="国家code",
                               null=True,
                               blank=True)
    county_num = models.CharField(verbose_name="标号",
                                  max_length=10,
                                  null=True,
                                  blank=True)

    class Meta:
        verbose_name = "国家表"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.countname


class Provinces(BaseModel):
    provincesname = models.CharField(max_length=128,
                                     verbose_name="城市名字")
    # counties = models.OneToOneField(to="Counties",
    #                                 verbose_name="所属国家",
    #                                 related_name="coun",
    #                                 on_delete=models.CASCADE,
    #                                 null=True,
    #                                 blank=True)
    counties = TenantForeignKey(to="Counties",
                                verbose_name="所属国家",
                                related_name="coun",
                                on_delete=models.CASCADE,
                                null=True,
                                blank=True)
    provinces_num = models.CharField(verbose_name="编号",
                                     max_length=10,
                                     null=True,
                                     blank=True)

    class Meta:
        verbose_name = "省份表"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.provincesname


class City(BaseModel):
    cityname = models.CharField(max_length=128,
                                verbose_name="城市名字",
                                null=True,
                                blank=True)
    provinces = TenantForeignKey(to="Provinces",
                                 verbose_name="所属省份",
                                 related_name="prov",
                                 on_delete=models.CASCADE,
                                 null=True,
                                 blank=True)
    city_num = models.CharField(max_length=10,
                                   verbose_name="城市标号",
                                   null=True,
                                   blank=True)


    class Meta:
        verbose_name = "城市表"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.cityname

serialzier.py

from models import (Jobs,
                    Aivideomodel,
                    Aiability,
                    Question,
                    Candidate,
                    InvitationJobInterviewForm,
                    Jobtype,
                    Functions,
                    City,
                    Provinces,
                    Counties)

class JobTypeSerializer(serializers.ModelSerializer):
    functions_name = serializers.CharField(source='functions.function_name')

    class Meta:
        model = Jobtype
        fields = ('id', 'jobtype_name', 'functions', 'functions_name')


class CitySerializer(serializers.ModelSerializer):
    provinces_name = serializers.CharField(source='provinces.provincesname') # 跨一张表序列化省的名字
    count_id = serializers.IntegerField(source='provinces.counties.id') # 跨两张表序列化国家的ID
    count_name = serializers.CharField(source='provinces.counties.countname') # 跨两张表序列化国家的名字 注意 source='' 指定来源那张表那个字段 注意这些外键关联的表model必须要导入进来

    class Meta:
        model = City
        fields = ('id', 'cityname', 'provinces_id', 'provinces_name', 'count_id', 'count_name')