python - Django Rest Framework 外键嵌套

Question

我试图将我的用户表嵌套在我的关系表中。所以不是这个:

[
    {
        "user": 1,
        "related_user": 2,
        "relationship": "followed_by"
    }
]

我想得到这个:

[
    {
        "user": {
            "username": "user1",
            "name": "User 1",
            "email": "bla",
            "phone": "bla",
            "date_joined": "2017-11-01T21:34:13.101256Z"
         },
        "related_user": {
            "username": "user2",
            "name": "User 2",
            "email": "bla",
            "phone": "bla",
            "date_joined": "2017-11-01T21:34:13.101256Z"
         },
        "relationship": "followed_by"
    }
]

我查阅了教程并尝试添加 serializers.RelatedField 、 UserSerializer(many=true, read-only=true) 等，但没有任何效果

模型.py

class User(models.Model):
    username = models.CharField(max_length=255)
    name = models.CharField(max_length=255)
    email = models.CharField(max_length=255)
    phone = models.CharField(max_length=255)
    date_joined = models.DateTimeField(auto_now_add=True, blank=True)

    def __str__(self):
        return str(self.pk) + ", " + self.username


RELATIONSHIP_CHOICE = [
    ("follows", "follows"),
    ("followed_by", "followed_by"),
    ("none", "none"),
]

class Relationship(models.Model):
    user = models.ForeignKey(User, related_name="primary_user", null=True)
    related_user = models.ForeignKey(User, related_name="related_user", null=True)
    relationship = models.CharField(max_length=40, choices=RELATIONSHIP_CHOICE, default=RELATIONSHIP_CHOICE[0])

序列化器.py

from rest_framework import serializers
from . import models

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.User
        fields = (
            'username',
            'name',
            'email',
            'phone',
            'date_joined',
        )


class RelationshipSerializer(serializers.ModelSerializer):
    related_user = UserSerializer(many=True)

    class Meta:
        model = models.Relationship
        fields = (
            'user',
            'related_user',
            'relationship',
            'related_user'
        )

我尝试将相关用户添加到我的序列化程序，但没有成功。我收到一个错误:“用户”对象不可迭代

感谢任何帮助。

Answer 1

class RelationshipSerializer(serializers.ModelSerializer):
    user = UserSerializer(read_only=True)
    related_user = UserSerializer(read_only=True)

    class Meta:
        model = models.Relationship
        fields = (
            'user',
            'related_user',
            'relationship'
        )

user = UserSerializer(read_only=True, many=True) 用于 manytomany 字段，user = UserSerializer(read_only=True) 用于 ForeignKey 字段。