django - How to save current login user? user_id may not be NULL -

i have error:

appname_mymodel.user_id may not null

def form_view(request):     user = request.user     f_form = fform(request.post or none, request.files or none)     if request.method == "post":         if f_form.is_valid():             f_form.user = user             f_form.save()             return httpresponseredirect('/thanks/')      return render_to_response('upload.html', {'f_form': f_form}, context_instance=requestcontext(request)) 

forms.py:

class fform(modelform):     class meta:         model = mymodel         exclude =['user'] 

how save current login user?

the form doesn't have user attribute useless assign it. should instead is:

if f_form.is_valid():     my_model = f_form.save(commit=false)     my_model.user = user     my_model.save() 

this way form construct mymodel instance, not attempt save database. can fill user field , save it.