使用Django表单类的mixin [英] Using a mixin with a Django form class

问题描述

我正在考虑创建一个mixin表单类，以便我可以添加一组通用的字段到各种其他非常不同的形式。只需使用它作为基类就不能正常工作，因为我想要使用其他表单作为基类，如下所示：

  class NoteFormMixin（object）：
 note = forms.CharField（）
 
 class MainForm（forms.Form）：
 name = forms.CharField（）
 age = forms.IntegerField（）
 
 class SpecialForm（MainForm，NoteFormMixin）：
 favorite_color = forms.CharField（）
  

我唯一的问题是：这是如何工作的？到目前为止，它看起来像是使用mixin，然后它不能识别从该mixin设置的字段：

 > >> ff1 = SpecialForm（）
>>> ff1.fields 
 {'name'：< django.forms.fields.CharField object at 0x178d3110>，'age'：< django.forms.fields.IntegerField object at 0x178d3190>，'favorite_color'：< django.forms.fields.CharField对象在0x178d3210>} 
  

这只是一些不能完成？

解决方案

问题是您的NoteFormMixin是从对象而不是forms.Form派生的。您需要将其更改为：

  class NoteFormMixin（forms.Form）：
 note = forms。 CharField（）
  

I'm thinking about creating a mixin form class so that I can add a common set of fields to a variety of otherwise very different forms. Just using it as a base class won't work because I want to be able to use other forms as base classes like so:

class NoteFormMixin(object):
    note = forms.CharField()

class MainForm(forms.Form):
    name = forms.CharField()
    age = forms.IntegerField()

class SpecialForm(MainForm, NoteFormMixin):
    favorite_color = forms.CharField()

My only question is: how does this work? So far it looks like if I use a mixin, then it doesn't recognize the fields set from that mixin:

>>> ff1 = SpecialForm()
>>> ff1.fields
{'name': <django.forms.fields.CharField object at 0x178d3110>, 'age': <django.forms.fields.IntegerField object at 0x178d3190>, 'favorite_color': <django.forms.fields.CharField object at 0x178d3210>}

Is this just something that can't be done?

解决方案

The issue is that your NoteFormMixin is deriving from object instead of forms.Form. You need to change it to be like so:

class NoteFormMixin(forms.Form):
    note = forms.CharField()

这篇关于使用Django表单类的mixin的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！