python - 努力让 django_comments 与 Django REST Framework 一起工作

Question

我是第一次在一个项目中使用 Django REST Framework，我正在努力处理一个特定的部分。该项目是一个问题跟踪器类型的应用程序，它使用 django_comments 允许对问题发表评论。我现在正在它之上构建一个 API，以允许创建一个移动应用程序。

我创建了以下序列化器:

from django.contrib.auth.models import User
from todolist.models import Project, Issue
from rest_framework import serializers
from django_comments.models import Comment

class UserSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = User
        fields = ('id', 'email', 'first_name', 'last_name')


class ProjectSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Project
        fields = ('name', 'description', 'owner')


class CommentSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Comment


class IssueSerializer(serializers.HyperlinkedModelSerializer):
    comments = CommentSerializer(many=True)

    class Meta:
        model = Issue

这是我的项目范围 urls.py，我在其中定义了路由:

from django.conf.urls import patterns, include, url 
from todolist.views import HomeTemplateView, UserViewSet, ProjectViewSet, IssueViewSet, CommentViewSet
from rest_framework import routers
from rest_framework.authtoken.views import obtain_auth_token

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

router = routers.DefaultRouter()
router.register(r'users', UserViewSet)
router.register(r'projects', ProjectViewSet)
router.register(r'issues', IssueViewSet)
router.register(r'comments', CommentViewSet)

urlpatterns = patterns('',
    # Examples:
    # url(r'^$', 'projectile.views.home', name='home'),
    # url(r'^projectile/', include('projectile.foo.urls')),

    # Uncomment the admin/doc line below to enable admin documentation:
    # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:
    url(r'^admin/', include(admin.site.urls)),

    # Comments
    (r'^comments/', include('django_comments.urls')),

    # Login
    url(r'^accounts/login/$', 'django.contrib.auth.views.login'),

    # Logout
    url(r'^accounts/logout/$', 'django.contrib.auth.views.logout_then_login', {'login_url': '/accounts/login/'}),

    # To-do list
    url(r'^projects/', include('todolist.urls')),

    # Home page
    url(r'^$', HomeTemplateView.as_view(
        template_name="todolist/home.html",
        )), 

    # Router URLs
    url(r'^api/', include(router.urls)),

    # REST framework auth URLs
    url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
    url(r'^api-token-auth/', obtain_auth_token),

    # API docs
    url(r'^docs/', include('rest_framework_swagger.urls'))
)

当我运行一个试图获取所有评论的测试时，我看到了以下错误:

ImproperlyConfigured: Could not resolve URL for hyperlinked relationship using view name "contenttype-detail". You may have failed to include the related model in your API, or incorrectly configured the `lookup_field` attribute on this field.

此外，当我获取问题时，它不包含评论。

现在，这个错误在我看来是在获取评论时无法将评论与其父项相匹配。我有 experienced similar problems when using Tastypie in the past ，我不确定如何使用 DRF 解决它。

Answer 1

在您的 Comment 序列化程序中，明确指定评论实例字段并排除字段 contenttype。

class CommentSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Comment
        fields = ('field_1','field_2','field_3') #here goes your comment fields and dont include contenttype field

问题是 DRF 将尝试应用超链接来表示所有关系，而对于 contenttype 字段，您没有 View 或序列化程序，您也不需要它。