DRF:在相关的序列化程序上的自定义排序 [英] DRF: custom ordering on related serializers

问题描述

我有两个序列化器，一个用于讲师，一个用于课程.讲师序列化程序与课程的定义关系如下:

I've got two serializers one for an Instructor and one for a Course. The Instructor serializer has a defined relationship to the courses like so:

courses = CourseSerializer(many = True，read_only = True)

如何在教师序列化程序中为课程指定顺序?

注意:我已经在Course Meta类中定义了 ordering 值，但这是我希望在其他所有地方使用的默认排序方式.我想要的是api输出的自定义排序(特别是dept，number，-semester，而不是默认的-semester).

Note: I have defined the ordering value in the Course Meta class, but it is the default sorting I want everywhere else. What I want is a custom ordering for api output (specifically dept, number, -semester rather than the default -semester).

推荐答案

由于它是只读的，在该字段中使用序列化方法不是一样容易吗?

Since it is read only, wouldn't it be just as easy to use a serializer method for that field?

class InstructorSerializer(serializers.ModelSerializer):
    courses = serializers.SerializerMethodField()

    def get_courses(self, obj):
         ordered_queryset = <do your magic here>
         return CourseSerializer(ordered_queryset, many=True, context=self.context).data

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