You probably want to change the attributes of the model object
directly.
"If you call save() with commit=False, then it will return an object
that hasn't yet been saved to the database."
Source:
http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#the-save-method
So I would do something like this:
def my_change_view(request, id):
#get instance based on id here
#....
if request.method == 'POST':
form = MyModelForm(request.POST, instance=instance)
if form.is_valid():
obj = form.save(commit=False)
obj.created_by = request.user
obj.save()
form.save_m2m()
return redirect('/somewhere')
else:
form = MyModelForm(instance=instance)
return render_to_response.....
I hope this helps. Remember to call form.save_m2m() if your model has
any many-to-many relations. I also would suggest to (re-)read django's
excellent documentation forms.
On Mar 21, 10:00 pm, Cesar Devera <cesardev...@gmail.com> wrote:
> hi.
>
> I have a ModelForm based on an Model like this:
>
> class MyModel(models.Model):
> attr1 = models.CharField()
> attr2 = models.CharField()
> attr3 = models.CharField()
> createdby = models.ForeignKey(User, related_name='createdby',
> db_column='createdbyid')
> calculatedfield = models.CharField()
>
> class MyModelForm(ModelForm):
> class Meta:
> model = MyModel
>
> the attribute fields attr1, attr2 and attr3 are properly shown on my
> html page, and correctly restored on my server-side view like this:
>
> def save(request,id):
> user = request.user
> try:
> mymodel = MyModel.objects.get(pk=id)
> except:
> mymodel = MyModel()
> form = MyModelForm(request.POST, instance=mymodel)
>
> now comes the problem: I want to set the createdby attribute only on
> my view, AFTER the html page Post. I want to set the createdby and any
> other calculated field on server side. is it possible?
>
> I tried:
>
> form['createdby'] = request.user
>
> but it didn't seem to work.
>
> this field (createdby) is NOT NULL and so I wouldn't like to set it to
> NULL, save the form with form.save() and later recover the entity
> again and manipulate the remaining fields...
>
> any ideas?
>
> thanks in advance.
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