Django Rest框架属性错误

Question

我正在阅读一本介绍 Django 和 Django Rest 框架的书。本教程创建了一个包含游戏、类别、玩家和分数的休息 API，它们之间具有合适的关系模型。 我在插入游戏类别时偶然发现了一个问题，我收到以下错误：

AttributeError at /game-categories/
'GameCategory' object has no attribute 'games'
Request Method: POST
Request URL:    http://127.0.0.1:8000/game-categories/
Django Version: 1.10.5
Exception Type: AttributeError
Exception Value:    
'GameCategory' object has no attribute 'games'
Exception Location: C:\Users\user\AppData\Local\Programs\Python\Python36-32\lib\site-packages\rest_framework\fields.py in get_attribute, line 103
Python Executable:  C:\Users\user\AppData\Local\Programs\Python\Python36-32\python.exe
Python Version: 3.6.0
Python Path:    
['C:\\Python\\Django01\\gamesapi',
 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32\\python36.zip',
 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32\\DLLs',
 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32\\lib',
 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32',
 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages']
Server time:    Wed, 8 Mar 2017 09:40:42 +0000

我的Game和GameCategory型号如下：

class GameCategory(models.Model):
    name = models.CharField(max_length=200)

    class Meta:
        ordering = ('name',)

    def __str__(self):
        return self.name

class Game(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    name = models.CharField(max_length=200, blank=True, default='')
    game_category = models.ForeignKey(GameCategory, related_name='games', on_delete=models.CASCADE)
    release_date = models.DateTimeField()
    game_category = models.CharField(max_length=200, blank=True, default='')
    played = models.BooleanField(default=False)

    class Meta:
        ordering = ('name',)
    def __str__(self):
        return self.name

还有我的 urls.py 的 sn-p：

urlpatterns = [
    url(r'^game-categories/$', views.GameCategoryList.as_view(),name=views.GameCategoryList.name),
    url(r'^game-categories/(?P<pk>[0-9]+)$', views.GameCategoryDetail.as_view(), name=views.GameCategoryDetail.name),

views.py：

from games.models import GameCategory
from games.models import Game
from games.models import Player
from games.models import PlayerScore    
from games.serializers import GameCategorySerializer
from games.serializers import GameSerializer
from games.serializers import PlayerSerializer
from games.serializers import PlayerScoreSerializer
from rest_framework import generics
from rest_framework.response import Response
from rest_framework.reverse import reverse

class GameCategoryList(generics.ListCreateAPIView):
    queryset=GameCategory.objects.all()
    serializer_class=GameCategorySerializer
    name='gamecategory-list'

class GameCategoryDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset=GameCategory.objects.all()
    serializer_class = GameCategorySerializer
    name = 'gamecategory-detail'

class GameList(generics.ListCreateAPIView):
    queryset=Game.objects.all()
    serializer_class = GameSerializer
    name = 'game-detail'

class GameDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset=Game.objects.all()
    serializer_class=GameSerializer
    name='game-detail'

序列化器.py

from rest_framework import serializers
from games.models import GameCategory
from games.models import Game
from games.models import Player
from games.models import PlayerScore
import games.views

class GameCategorySerializer(serializers.HyperlinkedModelSerializer):
    games = serializers.HyperlinkedRelatedField(
        many=True,
        read_only=True,
        view_name='game-detail'
    )

    class Meta:
        model = GameCategory
        fields = ('url','pk','name','games')

class GameSerializer(serializers.HyperlinkedModelSerializer):
    #We want to display the game categorys name instead of the id
    game_category = serializers.SlugRelatedField(queryset=GameCategory.objects.all(), slug_field='name')

    class Meta:
        model = Game
        fields = (
            'url',
            'game_category',
            'name',
            'release_date',
            'played'
        )

我对 Python 还是很陌生，更不用说 Django，所以我很难从给出的调试信息中找出错误。

谁能帮我理解问题出在哪里以及为什么？

Answer 1

从GameCategorySerializer 中删除HyperlinkedModelSerializer 怎么样？

class GameCategorySerializer(serializers.ModelSerializer):
    # rest here unchanged

查看here了解更多信息。

[更新]：Game 模型中有重复项！

game_category = models.ForeignKey(GameCategory, related_name='games', on_delete=models.CASCADE)

和

game_category = models.CharField(max_length=200, blank=True, default='')

您应该将第二个 game_category 字段重命名为其他名称。因此，您得到的错误。 GameCategorySerializer 尝试处理此字段（它没有 related_name 属性）而不是第一个 (ForeignKey) 字段。