Question

我们希望用户能够为我们站点中的各个选择字段定义选项。这些选项将放在自己的表（模型）中。

对于API，我们有“票证”模型。该字段具有“类型”字段，该字段是“ TicketType”模型的外键。

我收到此错误：

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

如果我从故障单模型中删除类型字段，该错误就会消失。我已经在网上阅读了很多有关此问题的文章，并尝试了许多不同的方法，但是到目前为止，还无法修复它。

models.py：

from django.db import models
from django.utils import timezone
from django.utils.translation import ugettext_lazy as _


class Ticket(models.Model):
    summary = models.CharField(
        verbose_name=_('Summary'),
        max_length=255,
    )
    description = models.TextField(
        verbose_name=_('Description'),
        blank=True,
    )
    type = models.ForeignKey(
        'TicketType',
        verbose_name=_('Type'),
        on_delete=models.PROTECT,
    )
    ...other fields omitted...
    created = models.DateTimeField(
        verbose_name=_('Created'),
        default=timezone.now,
    )


class TicketType(models.Model):
    type = models.CharField(
        verbose_name=_('Type'),
        max_length=255,
    )

serializers.py

from rest_framework import serializers, permissions

from tickets.models import Ticket, TicketType


class TicketSerializer(serializers.HyperlinkedModelSerializer):

    url = serializers.HyperlinkedIdentityField(view_name="tickets:ticket-detail")
    permission_classes = (permissions.IsAuthenticated,)

    class Meta:
        model = Ticket
        fields = (
            'url',
            'id',
            'summary',
            'description',
            'type',
            ...other fields omitted...
            'created',
        )


class TicketTypeSerializer(serializers.HyperlinkedModelSerializer):

    url = serializers.HyperlinkedIdentityField(view_name="tickets:tickettype-detail")
    permission_classes = (permissions.IsAuthenticated,)

    class Meta:
        model = TicketType
        fields = (
            'url',
            'id',
            'type',
        )

views.py

from rest_framework import permissions
from rest_framework.generics import ListCreateAPIView, RetrieveUpdateAPIView

from tickets.models import Ticket, TicketType
from tickets.serializers import TicketSerializer, TicketTypeSerializer


class TicketList(ListCreateAPIView):
    permission_classes = (permissions.IsAuthenticated,)
    queryset = Ticket.objects.all()
    serializer_class = TicketSerializer


class TicketDetail(RetrieveUpdateAPIView):
    permission_classes = (permissions.IsAuthenticated,)
    queryset = Ticket.objects.all()
    serializer_class = TicketSerializer


class TicketTypeList(ListCreateAPIView):
    permission_classes = (permissions.IsAuthenticated,)
    queryset = TicketType.objects.all()
    serializer_class = TicketTypeSerializer


class TicketTypeDetail(RetrieveUpdateAPIView):
    permission_classes = (permissions.IsAuthenticated,)
    queryset = TicketType.objects.all()
    serializer_class = TicketTypeSerializer

我尝试过的大多数事情都与在各个地方添加lookkup_field有关，但我想我没有找到正确的组合。

编辑：忘记发布我的urls.py。

urls.py

from django.urls import path
from tickets import views

app_name = 'tickets'

urlpatterns = [
    path('', views.TicketList.as_view(), name='ticket-list'),
    path('<int:pk>/', views.TicketDetail.as_view(), name='ticket-detail'),
    path('types/', views.TicketTypeList.as_view(), name='tickettype-list'),
    path('types/<int:pk>/', views.TicketTypeDetail.as_view(), name='tickettype-detail'),
]

Answer 1

解决了！

在这种情况下，DRF试图“反转”以获得该字段的选项列表时，似乎没有提供完全合格的view_name。

我将其添加到TicketType序列化程序中：

    type = serializers.HyperlinkedRelatedField(
        queryset=TicketType.objects.all(),
        required=True,
        view_name='tickets:tickettype-detail',
    )

对于view_name，DRF使用的是“ tickettype-detail”。

然后将其添加到TicketType模型中：

    def __str__(self):
        return self.type

DRF：无法使用视图名称“ tickettype-detail”

1 个答案: