custom form author - auto save author to DB

I have a custom form... I'd like to auto save the author (authenticated user) for the form data. I'm using ModelForm for creating the form.

models.py

    class Tracker(models.Model):
        client = models.ForeignKey(Clients)
        user = models.ForeignKey(User)
        description = models.TextField()
...

I have also linked the custom profile to the django users table... also the auth works fine... I can read the user and id...

forms.py

class TrackerForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(TrackerForm, self).__init__(*args, **kwargs)
        self.fields.keyOrder = ['date_job_start','date_job_end','description','onsite','billable','client']
    class Meta:
        model = Tracker
        widgets = {
            'cl开发者_Python百科ient': HiddenInput(),
        }

When the form is created from the upper class and I try to save it... it wants the user data (missing warning). How can I change it so that it would automatically save the authenticated user instead of asking for it?? I know that I dont' have the user field defined here... that's because I don't want a dropdown for it... I want the user to be saved from the auth...without any selection or display...

P.S.: I know about the initial option... there must be a better way?

Thanks! BR

class TrackerForm(ModelForm):
    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user')
        super(TrackerForm, self).__init__(*args, **kwargs)
        self.fields.keyOrder = ['date_job_start','date_job_end','description','onsite','billable','client']

    class Meta:
        model = Tracker
        widgets = {
        '    client': HiddenInput(),
        }
        exclude = ('user',)

    def save(self):
        obj = super(TrackerForm, self).save(commit=False)
        obj.user = self.user
        obj.save()
        return obj

And in view:

form = TrackerForm(user=request.user) #and other parameters