Python ModelSerializer django rest 框架中的所有字段
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All fields in ModelSerializer django rest framework
提问by tim
models.py:
模型.py：
class Car():
producer = models.ForeignKey(Producer, blank=True, null=True,)
color = models.CharField()
car_model = models.CharField()
doors = models.CharField()
serializers.py:
序列化程序.py：
class CarSerializer(ModelSerializer):
class Meta:
model = Car
fields = Car._meta.get_all_field_names()
So, here I want to use all fields. But I have an error:
所以，在这里我想使用所有字段。但我有一个错误：
Field name producer_idis not valid for model Car.
字段名称producer_id对模型无效Car。
How to fix that?
如何解决？
Thanks!
谢谢！
采纳答案by Michael B
According to the Django REST Framework's Documentation on ModelSerializers:
根据Django REST Framework's Documentation on ModelSerializers：
By default, all the model fields on the class will be mapped to a corresponding serializer fields.
默认情况下，类上的所有模型字段都将映射到相应的序列化程序字段。
This is different than Django's ModelForms, which requires you to specify the special attribute '__all__'to utilize all model fields. Therefore, all that is necessary is to declare the model.
这与Django 的 ModelForms不同，后者要求您指定特殊属性'__all__'以利用所有模型字段。因此，所需要做的就是声明模型。
class CarSerializer(ModelSerializer):
class Meta:
model = Car
Update (for versions >= 3.5)
更新（对于版本 >= 3.5）
The behaviour described above was deprecated in version 3.3, and forbidden since version 3.5.
上述行为在 3.3 版中已被弃用，并自 3.5 版起被禁止。
It is now mandatoryto use the special attribute '__all__'to use all fields in the Django REST Framework, same as Django Forms:
现在必须使用特殊属性'__all__'来使用 Django REST Framework 中的所有字段，与 Django Forms 相同：
Failing to set either fields or exclude raised a pending deprecation warning in version 3.3 and raised a deprecation warning in 3.4. Its usage is now mandatory.
未能设置任一字段或排除在 3.3 版中引发了未决弃用警告，并在 3.4 中引发了弃用警告。它的使用现在是强制性的。
So now it must be:
所以现在它必须是：
class CarSerializer(ModelSerializer):
class Meta:
model = Car
fields = '__all__'
回答by Venu Saini
You could use fields = '__all__'to get all your fields or you could specify if you want a limited number of fields to be returned. See documentation.
您可以使用fields = '__all__'获取所有字段，也可以指定是否要返回有限数量的字段。请参阅文档。
But this returns the idvalue for the foreign key field i.e. producerin your case. To get all the fields for producer, you need to create a serializer class for that too. See here.
但这会返回id外键字段的值，即producer在您的情况下。要获取 的所有字段producer，您还需要为此创建一个序列化程序类。见这里。
So your updated serializers.pyshould be:
所以你更新的serializers.py应该是：
class ProducerSerializer(ModelSerializer):
class Meta:
model = Producer
class CarSerializer(ModelSerializer):
producer= ProducerSerializer(read_only=True)
class Meta:
model = Car
fields = ('producer', 'color', 'car_model', 'doors', )
