将自定义表单参数传递给表单集 [英] Passing Custom Form parameter to formset

问题描述

我定义了以下表单

class MyForm(ModelForm):  
    def __init__(self, readOnly=False, *args, **kwargs):  
      super(MyForm,self).__init__(*args,**kwrds)  
      if readOnly:  
        Do stuff to make the inputs readonly

当我在视图中将其实例化为窗体时，MyForm完美运行

form = MyForm（readOnly = True，instance = ModelA）

MyForm works perfectly when I instantiate it in the view as a form
form = MyForm(readOnly=True, instance=ModelA)

但是当我尝试在inlineformset_factory中使用它时

Formset = inlineformset_factory（ModelA，ModelB form = MyForm（readOnly = True））

我收到错误消息 NoneType对象不可调用。

but when I try to use it in the inlineformset_factory
Formset = inlineformset_factory(ModelA, ModelB form=MyForm(readOnly=True))
I get the error "NoneType object is not callable."

我认为这是因为表单是在没有模型实例的情况下初始化的

，因为MyForm是在内联中初始化的

I think this is because the form is being initialised without a model instance
because MyForm is being initialised within the inline

我知道问题是我在内联调用中使用MyForm的方式

，因为如果执行以下任一操作，我会得到相同的错误

I know the problem is the way I am using the MyForm in the inline call
because I get the same error if I do either of the following

Formset = inlineformset_factory（ModelA，ModelB form = MyForm（readOnly = True））

Formset = inlineformset_factory（ModelA，ModelB form = MyForm（））

但是如果我这样做，它会起作用

Formset = inlineformset_factory（ModelA，ModelB form = MyForm）

but it works if I do
Formset = inlineformset_factory(ModelA, ModelB form=MyForm)

很显然，readOnly参数默认为False，而我的输入是没有改变。
有人知道我可以使用inlineformset_factory将readOnly参数传递给MyForm还是我可以实现我想要的东西？

obviously the readOnly param defaults to False and my inputs are not changed. Does anyone know how I can pass the readOnly param to MyForm using the inlineformset_factory or how else I can achieve what I want?

感谢
Andrew

Thanks Andrew

推荐答案

浏览 django.forms.models ，您会看到 inlineformset_factory 需要表单 class ，而不是实例。这就是为什么上一次尝试有效而其他失败...在实例中传递失败的原因。

Digging through django.forms.models you can see that inlineformset_factory needs a form class, not an instance. This is why your last try works and the other fail...passing in an instance won't work.

这应该可以为您提供所需的内容：

This should give you what you are looking for:

class MyReadOnlyForm(MyForm):

    def __init__(self, *args, **kwargs):
        super(MyReadOnlyForm,self).__init__(readOnly=True, *args,**kwargs)


Formset = inlineformset_factory(ModelA, ModelB form=MyReadOnlyForm)

如果您同时需要这两个版本

If you need both versions

if read_only is True:
    form_class = MyReadOnlyForm
else:
    form_class = MyForm 

Formset = inlineformset_factory(ModelA, ModelB form=form_class)

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