对象不支持项目分配错误

问题描述：

在我的 views.py 中，我在保存表单之前分配值。我以前用这样做：

In my views.py I assign values before saving the form. I used to do it the following way:

projectForm.lat = session_results['lat']
projectForm.lng = session_results['lng']

现在，由于变量列表有点长，我想使用以下循环来循环 session_results （如Adam here ）：

Now, since the list of variables got a bit long, I wanted to loop over session_results with the following loop (as described by Adam here):

for k,v in session_results.iteritems():
    projectForm[k] = v

但是我收到错误项目对象不支持循环解决方案的项目分配。我有麻烦了解为什么。 项目是模型类，我用于ModelForm。

But I get the error 'Project' object does not support item assignment for the loop solution. I have trouble to understand why. Project is the model class, which I use for the ModelForm.

感谢您的帮助！

答

错误似乎很清楚：模型对象不支持项目分配。
MyModel.objects.latest（'id'）['foo'] ='bar'将抛出同样的错误。

The error seems clear: model objects do not support item assignment. MyModel.objects.latest('id')['foo'] = 'bar' will throw this same error.

这是一个有点混淆，你的模型实例被称为 projectForm ...

It's a little confusing that your model instance is called projectForm...

在循环中重现您的第一个代码块，您需要使用 setattr

To reproduce your first block of code in a loop, you need to use setattr

for k,v in session_results.iteritems():
    setattr(projectForm, k, v)

对象不支持项目分配错误

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