可以在Django Rest Framework中的to_representation（）访问正常字段

[英]Can to_representation() in Django Rest Framework access the normal fields

本文翻译自 Aaron Lelevier 查看原文 2015/08/04 6700 python/ django/ django-rest-framework

The docs on using to_representation is somewhat short. This method is used by Django Rest Framework 3.0+ to change the representation of your data in an API.

关于使用to_representation的文档有点简短。 Django Rest Framework 3.0+使用此方法更改API中数据的表示形式。

Here' the documentation link:

这里是文档链接:

http://www.django-rest-framework.org/api-guide/serializers/#overriding-serialization-and-deserialization-behavior

Here is my current code:

这是我目前的代码:

from django.forms.models import model_to_dict

class PersonListSerializer(serializers.ModelSerializer):

    class Meta:
        model = Person
        fields = ('foo', 'bar',)

    def to_representation(self, instance):
        return model_to_dict(instance)

When I do this code, it returns all fields in the model instead of the fields that I have specified above in class Meta: fields.

当我执行此代码时,它返回模型中的所有字段,而不是我在类Meta:fields中指定的字段。

Is it possible to reference the class Meta: fields within the to_representation method?

是否可以在to_representation方法中引用类Meta:字段?

1 个解决方案

#1

DRF's ModelSerializer already has all the logic to handle that. In your case you shouldn't even need to customize to_representation. If you need to customize it, I would recommend to first call super and then customize the output:

DRF的ModelSerializer已经拥有了处理它的所有逻辑。在您的情况下,您甚至不需要自定义to_representation。如果你需要自定义它,我建议先调用super然后自定义输出:

class PersonListSerializer(serializers.ModelSerializer):
    class Meta:
        model = Person
        fields = ('foo', 'bar',)

    def to_representation(self, instance):
        data = super(PersonListSerializer, self).to_representation(instance)
        data.update(...)
        return data

P.S. if you are interested to know how it works, the magic actually does not happen in ModelSerializer.to_representation. As a matter of fact, it does not even implement that method. Its implemented on regular Serializer. All the magic with Django models actually happens in get_fields which calls get_field_names which then considers the Meta.fields parameters...

附:如果你有兴趣知道它是如何工作的,那么魔法实际上并不会发生在ModelSerializer.to_representation中。事实上,它甚至没有实现这种方法。它在常规的Serializer上实现。 Django模型的所有魔法实际上都发生在get_fields中,它调用get_field_names然后考虑Meta.fields参数......

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