我第一次在项目中使用Django REST Framework,我正在努力解决一个特定问题。该项目是一个问题跟踪器类型的应用程序,它使用django_comments
来允许对问题发表评论。我现在正在构建一个API,以便创建一个移动应用程序。
我创建了以下序列化程序:
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
,我在其中定义路线:
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'))
)
当我运行试图获取所有评论的测试时,我看到以下错误:
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,当我提取问题时,它不包含评论。
现在,我觉得这个错误是在获取评论时,它无法将评论与其父评论相匹配。我experienced similar problems when using Tastypie in the past,我不确定如何用DRF来解决它。
答案 0 :(得分:3)
在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会尝试应用超链接来表示所有关系,对于contenttype
字段,您没有视图或序列化器,也不需要它。