Add data to ModelForm object before saving

Question

Say I have a form that looks like this:

forms.py

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

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  

The error I receive is:

TypeError: 'CreateAClassForm' object does not support item assignment 

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

Answer 1

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

Answer 2

Sometimes, the field might be required which means you can't make it past form.is_valid(). In that case, you can pass a dict object containing all fields to the form.

   if request.method == 'POST':        data = {         'fields1': request.user,         'fields2': additional_data,        }        form = CreateASomethingForm(data)      if form.is_valid():         form.commit(save)