DRF-如何在序列化程序中执行许多只读和只写字段答案

【问题标题】：DRF- how to do many readonly and writeonly fields in serializersDRF-如何在序列化程序中执行许多只读和只写字段
【发布时间】：2022-01-26 16:47:24
【问题描述】：

我在模型中使用了两个外键。我想在我们发出我尝试过的获取请求时显示这些字段名称，但它只工作一个字段而不是其余一个。模型.py

class Organization(models.Model):
    code = models.CharField(max_length=25, null=False, unique=True)
    name = models.CharField(max_length=100, null=False)
    location = models.ForeignKey(Location, on_delete=models.RESTRICT)
    mol_number = models.CharField(max_length=100)
    corporate_id = models.CharField(max_length=100)
    corporate_name = models.CharField(max_length=100)
    routing_code = models.CharField(max_length=100)
    iban = models.CharField(max_length=100)
    description = models.TextField()
    total_of_visas = models.IntegerField(null=False, default=0)
    base_currency = models.ForeignKey(Currency, on_delete=models.RESTRICT)

    def __str__(self):
        return self.name

序列化器.py

class OrganizationSerializer(serializers.ModelSerializer):
    location = serializers.CharField(read_only=True, source="location.name")
    base_currency = serializers.CharField(read_only=True, source="base_currency.currency")
    location_id = serializers.IntegerField(write_only=True, source="country.id")
    base_currency_id = serializers.IntegerField(write_only=True, source="base_currency.id")

    class Meta:
        model = Organization
        fields = ["id", "name", "location", "mol_number", "corporate_id", "corporate_name",
                  "routing_code", "iban", "description", "total_of_visas", "base_currency",
                  "location_id", "base_currency_id"]

    def create(self, validated_data):
         ...

    def update(self, instance, validated_data):
        ...

我怎样才能访问这两个字段???.. Anyhelp Apppreciable..

【问题讨论】：

这些是write_only?
通常您不应为location_id 和base_currency_id 指定source=：已经有一个具有该名称的“隐藏”字段，因此您可以省略这些名称的source=...。
好的。我删除了那个。但是我想同时访问 location 和 base_currency 但是当我发出获取请求时我得到了除 base_currency 之外的所有数据..

标签： serialization django-rest-framework

【解决方案1】：

您可以覆盖to_representation 方法

def to_representation(self, instance):
     ....

是这样的：

class OrganizationSerializer(serializers.ModelSerializer):
       ...
class Meta:
       ...
def to_representation(self, instance):
    rep = super(OrganizationSerializer, self).to_representation(instance)
    rep['location'] = instance.location.name //the .name is the field in the //location model that you want to return it can be anything in the model
    rep['base_currency'] = instance.base_currency.currency
    rep['location_id'] = instance.location_id.country.id
    rep['base_currency_id'] = instance.base_currency_id.base_currency_id
    return rep

def create(self, validated_data):
     ...

def update(self, instance, validated_data):

【讨论】：