DRF - 嵌套反向关系序列化器答案

【问题标题】：DRF - Nested Reverse Relation SerializersDRF - 嵌套反向关系序列化器
【发布时间】：2019-11-09 18:13:56
【问题描述】：

如何创建一个序列化程序，以返回 family 的所有结果以及所有反向关系？

         Family
           |
    +------+------+
    |             |
 Student    EmergencyContact
    |
   Fee

例如

{family: [{id: 1,
          student_set: [{id: 1, name: "bob Jones", fee_set: [{"Maths Fee": 3,  "English Fee": 5}}],
                        {id: 2, name: "Mike Jones", fee_set: [{"English Fee": 5}}],
          emergency_contact_set: [{id: 1, name:"Joe"}, {id: 2, name: "Mike"}]
         ]
}

我可以在字段中使用<model>_set 获得单个嵌套级别的数据，例如student_set, emergency_contact_set，但不是深嵌套，（fee_set）。

class FamilySerializer(serializers.ModelSerializer):
    student = StudentSerializer(many=True, read_only=True)  # does nothing
    class Meta:
          model = Family
          fields = ["id",
                    "name", 
                    "student", # returns nothing
                    "student_set" # only returns the students WITHOUT the fees
                   ]

输出（没有fees）：

{family: [{id: 1,
          student_set: [{id: 1, name: "bob Jones"}],
                        {id: 2, name: "Mike Jones"}],
          emergency_contact_set: [{id: 1, name:"Joe"}, {id: 2, name: "Mike"}],
         ]
}

理想情况下，我想在Family 中使用StudentSerializer 和EmergencyContactSerializer，以获取嵌套集。

【问题讨论】：

标签： django django-rest-framework

【解决方案1】：

您必须在XXXXSerializer 中使用source kwarg，例如。 source="<field>_set"（或在模型中重命名related_field，并将其用作source）。

class FamilySerializer(serializers.ModelSerializer):
    student = StudentSerializer(many=True, read_only=True, source="student_set") 
    ...

    class Meta:
        ...

student 字段将可供StudentSerializer 使用

见： https://riptutorial.com/django-rest-framework/example/30725/getting-list-of-all-related-children-objects-in-parent-s-serializer

【讨论】：