保存前向 ModelForm 对象添加数据 [英] Add data to ModelForm object before saving

问题描述

假设我有一个看起来像这样的表单:

Say I have a form that looks like this:

forms.py

class CreateASomethingForm(ModelForm):
    class Meta:
        model = Something
        fields = ['field2', 'field3', 'field4']

我希望表单具有这三个字段.但是我的 Something 类也有 field1.我的问题是 - 如果我不使用 ModelForm 收集数据，我该如何将数据添加到 field1.我尝试做这样的事情，但它不起作用，我不确定解决这个问题的正确方法:

I want the form to have these three fields. However my Somethingclass also has field1. My question is - how do I add data to field1, if I am not using the ModelForm to collect the data. I tried doing something like this, but it isn't working and I am unsure on the proper way to solve this:

views.py

def create_something_view(request):
    if (request.method == 'POST'):
        # Create an object of the form based on POST data
        obj = CreateASomething(request.POST)
        # ** Add data into the blank field1 ** (Throwing an error)
        obj['field1'] = request.user
        # ... validate, save, then redirect 

我收到的错误是:

TypeError: 'CreateAClassForm' object does not support item assignment

在 Django 中，在保存之前将数据分配给 ModelForm 对象的正确方法是什么?

In Django, what is the proper way to assign data to a ModelForm object before saving?

推荐答案

form = CreateASomething(request.POST)
if form.is_valid():
    obj = form.save(commit=False)
    obj.field1 = request.user
    obj.save()

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