I'm building simple Course Management App. I want Users to sign up for Course. Here's sign up model:

class CourseMembers(models.Model):
    student = models.ForeignKey(Student)
    course = models.ForeignKey(Course)

    def __unicode__(self):
        return unicode(self.student)

Student model is extended User model - I'd like to fill the form with request.user. In Course model most important is course_id, which i'm passing into view throught URL parameter (for example http://127.0.0.1:8000/courses/course/1/).

What i want to achieve, is to generate 'invisible' (so user can't change the inserted data) form with just input, but containing request.user and course_id parameter.