Django Rest 框架，如何在 ModelSerializer 中包含“__all__"字段和相关字段? [英] Django Rest framework, how to include '__all__' fields and a related field in ModelSerializer ?

问题描述

我有两种模型，一种具有 M2M 关系和相关名称.我想在序列化程序和相关字段中包含所有字段.

I have two models, one with M2M relation and a related name. I want to include all fields in the serializer and the related field.

models.py:

class Pizza(models.Model):
    name = models.CharField(max_length=50, unique=True)
    toppings = models.ManyToManyField(Topping, null=True, blank=True, related_name='pizzas')

class Topping(models.Model):
    name = models.CharField(max_length=50, unique=True)
    price = models.IntegerField(default=0)

serializer.py:

serializer.py:

class ToppingSerializer(serializers.ModelSerializer):
    class Meta:
        model = Topping
        fields = '__all__' 

这有效，但不包括相关字段.

This works but it doesn't include the related field.

 fields = ['name', 'price', 'pizzas'] 

这完全符合我的要求，但是当 Toppings 模型有很多字段时会发生什么.我想做类似的事情:

This works exactly as I want, but what happens when Toppings model has a lot of fields. I want to do something like :

fields = ['__all__', 'pizzas']

此语法导致错误提示:

字段名称 __all__ 对模型无效

Field name __all__ is not valid for model

有没有办法实现想要的行为?还是在使用相关名称时必须手动输入字段?

Is there a way to achieve the wanted behavior? Or the fields must be typed manually when using a related name ?

推荐答案

我刚刚查看了 Django Rest Framework 的源代码.框架似乎不支持您想要的行为.

I just checked the source code of Django Rest Framework. The behaviour you want seems not to be supported in the Framework.

fields 选项必须是列表、元组或文本 __all__.

The fields option must be a list, a tuple or the text __all__.

以下是相关源代码的片段:

Here is a snippet of the relevant source code:

    ALL_FIELDS = '__all__'
    if fields and fields != ALL_FIELDS and not isinstance(fields, (list, tuple)):
        raise TypeError(
            'The `fields` option must be a list or tuple or "__all__". '
            'Got %s.' % type(fields).__name__
        )

您不能将all"附加到包含字段的元组或列表中...

You cannot add 'all' additionally to the tuple or list with fields...

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