【问题标题】：How to get username of user's post in Django REST API instead of number?如何在 Django REST API 中获取用户帖子的用户名而不是数字？
【发布时间】：2019-09-27 02:44:58
【问题描述】：

我正在尝试通过 REST API 获取 iOS 应用程序的用户名。我可以得到用户号。如何获得实际用户名？

“作者”应该是用户帖子的用户名。

结果

HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

[
    {
        "author": 1,
        "title": "Test Title Post",
        "contents": "Test contents post"
  }

models.py

User = settings.AUTH_USER_MODEL

class PostDetail(models.Model):

    author           = models.ForeignKey(User, on_delete=models.CASCADE, related_name="PostDetail.author+") 
    title            = models.CharField('*Title', max_length=50)
    contents        = models.TextField('*Contents', max_length=450)

serializer.py

from rest_framework import serializers
from .models import PostDetail
from django.contrib.auth import get_user_model
from django.contrib.auth.models import User

class PostDetailSerializer(serializers.ModelSerializer):
   class Meta:
       model =PostDetail
       fields = (author, title, 'contents', )

apis.py

from rest_framework import viewsets, routers
from blog.models import PostDetail
from blog.serializer import PostDetailSerializer
from django.contrib.auth import get_user_model 
from django.contrib.auth.models import User

class PostViewSet(viewsets.ModelViewSet):
   queryset = PostDetail.objects.all()
   serializer_class = PostDetailSerializer

router = routers.DefaultRouter()
router.register(r'posts', PostViewSet)

我希望 "author": 1, 就像 "author": admin,.

【问题讨论】：

标签： django django-rest-framework

【解决方案1】：

您可以使用SerializerMethodField 执行此任务。你需要定义一个函数来获取作者的用户名。

这就是你的做法：

class PostDetailSerializer(serializers.ModelSerializer):
    author = serializers.SerializerMethodField()
    class Meta:
        model =PostDetail
        fields = (author, title, 'contents', )

    def get_author(self, obj):
        return obj.author.username

函数应命名为get_<field_name>。

【讨论】：

【解决方案2】：

您需要将您的PostDetailSerializer 更改为：

from rest_framework import serializers
from .models import PostDetail
from django.contrib.auth import get_user_model
from django.contrib.auth.models import User

class PostDetailSerializer(serializers.ModelSerializer):

   author = serializers.CharField(source='author.username', read_only=True)

   class Meta:
       model =PostDetail
       fields = (author, title, 'contents', )

【讨论】：

【解决方案3】：

如果您必须使用输入值，您可以创建自定义序列化器字段

class ForeignKeyField(serializers.RelatedFields):

    def to_representation(self, obj):
        return obj.name

这个字段可以在序列化器中使用

class PostDetailSerializer(serializers.ModelSerializer):

   author = ForeignKeyField()

   class Meta:
       model =PostDetail
       fields = (author, title, 'contents', )

【讨论】：