django rest框架：通过序列化程序validate（）方法设置字段级错误 [英] django rest framework: set field-level error from serializer validate() method

问题描述

我有一个序列化程序，它根据其他字段的值来验证字段，在错误响应中，我想将每个字段错误都显示为一个字段错误，而不是在 non_field_errors下显示所有内容，如果我在对象级别的validate方法中引发ValidationError。下面是我要实现的目标的说明：

I have a serializer that validates fields based on the values of other fields, In the error response I would like to show each field error as a field error as opposed to showing everything under "non_field_errors" which is what would happen if I were to raise a ValidationError in the object-level validate method. Below is an illustration of what I'm trying to achieve:

MySerializer(ModelSerializer):
    ...
    def validate(self, data):
        field_val1 = data['field_val1']
        field_val2 = data['field_val2']
        if not self._is_field_valid(field_val1, field_val2):
            # The below line is how I would do what I want with Django
            # Forms, however, it's not valid in DRF
            self._errors['field_val1'] = 'this field is not valid'

所需的错误响应为：

{'field_val1': ['this field is not valid']}

推荐答案

我在此页的 BaseSerializer部分中，有一个示例显示ValidationError可以在初始化时采用字典参数。

I figured it out, on this page of the documentation in the "BaseSerializer" section, there's an example that shows ValidationError can take a dictionary argument upon initialization.

如果我 raise ValidationError（{'field_val1'：['此字段无效']}）得到我想要的JSON响应。

If I raise ValidationError({'field_val1': ['this field is not valid']}) I get the JSON response I want.

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