Object does not support item assignment error


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']

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

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.

Thank you for your help!

Asked By: neurix



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

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

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)

Another way would be adding __getitem__, __setitem__ function

def __getitem__(self, key):
    return getattr(self, key)

You can use self[key] to access now.

Answered By: Ivan Wang
Categories: questions Tags: , , ,
Answers are sorted by their score. The answer accepted by the question owner as the best is marked with
at the top-right corner.