Django形式链接两个模型由多个到许多领域 [英] Django form linking 2 models by many to many field

问题描述

我有两个模型：

 class Actor(models.Model):
     name = models.CharField(max_length=30, unique = True)
     event = models.ManyToManyField(Event, blank=True, null=True)

 class Event(models.Model):
     name = models.CharField(max_length=30, unique = True)
     long_description = models.TextField(blank=True, null=True)

我想创建一个表单，允许我在添加新条目时识别两个模型之间的链接。这个工程：

I want to create a form that allows me to identify the link between the two models when I add a new entry. This works:

 class ActorForm(forms.ModelForm):
     class Meta:
           model = Actor

该表单包括名称和事件，允许我创建一个新的Actor并将其同时链接到现有的事件

The form includes both name and event, allowing me to create a new Actor and simultaneous link it to an existing Event.

另外，

 class EventForm(forms.ModelForm):
     class Meta:
           model = Event

此表单不包括演员协会。所以我只能创建一个新的事件。我不能同时链接到现有的Actor。

This form does not include an actor association. So I am only able to create a new Event. I can't simultaneously link it to an existing Actor.

我试图创建一个内联表单集：

I tried to create an inline formset:

 EventFormSet = forms.models.inlineformset_factory(Event,
       Actor,
       can_delete = False,
       extra = 2,
       form = ActorForm)

但是我收到错误

<'class ctg.dtb.models.Actor'> has no ForeignKey to <'class ctg.dtb.models.Event'>

这并不奇怪。 inlineformset适用于另一套模型，但这是一个不同的例子。我想我完全错了。

This isn't too surprising. The inlineformset worked for another set of models I had, but this is a different example. I think I'm going about it entirely wrong.

总体问题：我如何创建一个表单，让我创建一个新的事件并将其链接到现有的Actor ？

Overall question: How can I create a form that allows me to create a new Event and link it to an existing Actor?

推荐答案

个人来说，我会把ManyToMany以事件开头，而是每一个自己的...

Personally, I would put the ManyToMany on Event to begin with, but to each their own...

至于如何做，你想编写一个自定义的ModelForm（不是一个内联的formset），让我们称之为EventForm。它将处理所有事件的字段，并且还将具有 ModelChoiceField 或 ModelMultipleChoiceField 以允许选择Actor （s）涉及。那么在你看来，你会拆分事件字段和ForeignKey / M2M字段的处理。

As for how to do it, you'd want to write a custom ModelForm (not an inline formset), let's call it EventForm. It would handle all of your event's fields and would also have a ModelChoiceField or ModelMultipleChoiceField to allow selection of the Actor(s) involved. Then in your view you would split out the processing of the Event fields and the ForeignKey/M2M field.

有意义吗？ alt text http://sonicloft.net/im/52

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