Question

我想创建一个模型类＆＃34; Event＆＃34; （事件将是两个类型one_time_event和recurring_event），并且两个＆＃34; one_time_event＆＃34;的单独模型类。和＆＃34; recurring_event＆＃34;。

所以在表格Event中，我希望有类似的东西

event_id                   event_type(2choices)                    event_type_id
---------------------------------------------------------------------------
1                           one_time_event                one_time_event_Object
2                           recurring_event               recurring_event_object
3                           one_time_event                one_time_event_Object
4                           recurring_event               recurring_event_object

所以问题是如何定义我的模型类来实现这一目标。

提前致谢

Answer 1

您正在寻找contenttypes投稿应用中提供的GenericForeignKey。

简而言之，您将创建一个可以指向不同模型的键：

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType

class OneTimeEvent(models.Model):
   # your normal fields here

class RecurringEvent(models.Model):
   # your normal fields here

class Event(models.Model):
   # your normal fields here
   content_type = models.ForeignKey(ContentType)  # A link to any kind of content
   object_id = models.PositiveIntegerField() # The id for the linked object
   event_type = models.GenericForeignKey() # This can point to any kind of object

现在，你可以这样做：

recurring_event = RecurringEvent.objects.create()
event = Event()
event.event_type = recurring_event
event.save()

Django模型类和它们之间的关系

1 个答案: