How to create model objects via ModelForm ForeignKey? - django-models

Question

I have a model for Classroom and Student as shown below
class Classroom(models.Model):
COURSE_NAME = (
('MA8', 'Math 8'),
('SC10', 'Science 10'),
('PH11', 'Physics 11'),
('PH12', 'Physics 12'),
)
BLOCK_NUMBER = (
('11', 'Block 1-1'),
('12', 'Block 1-2'),
('13', 'Block 1-3'),
('14', 'Block 1-4'),
('21', 'Block 2-1'),
('22', 'Block 2-2'),
('23', 'Block 2-3'),
('24', 'Block 2-4'),
)
class_list = models.TextField()
course_name = models.CharField(max_length=20, choices=COURSE_NAME)
course_block = models.CharField(max_length=10, choices=BLOCK_NUMBER)
class Student(models.Model):
classroom = models.ForeignKey(Classroom, on_delete=models.CASCADE)
nickname = models.CharField(default='JohnS', max_length=31)
attend = models.BooleanField(default=True)
I created a form for Classroom.class_list and TextField is where the user copy/pastes a list of names. I want to then parse the class_list and save each individual name as nickname. I first tried the following but this doesn't seem to save the Student objects.
forms.py
class ClassroomForm(ModelForm):
class Meta:
model = Classroom
fields = ['course_name', 'course_block','class_list']
views.py
class ClassroomCreateView(CreateView):
model = Classroom
form_class = ClassroomForm
def form_valid(self, form):
classroom = form.save(commit=False)
s = Student()
for line in classroom.class_list:
s.nickname = line
s.save()
classroom.save()
return super(ClassroomCreateView, self).form_valid(form)
def get_success_url(self):
return reverse('classroom:submitted')
I also tried creating StudentForm which allows a user to choose course_name and course_block (which corresponds to a particular class_list). The form or view would then create the individual Student objects and display them. I read about ModelChoiceField but I can't figure out how to implement this.
How and where do I (auto) create Students objects from a ForeignKey field?

Answer 1

I solved my question with the help of this answer. Here is the modified code I used for models.py. My view is just a standard CreateView from the ModelForm.
class Classroom(models.Model):
... dictionary stuff ..
class_list = models.TextField()
course_name = models.CharField(max_length=20, choices=COURSE_NAME)
course_block = models.CharField(max_length=10, choices=BLOCK_NUMBER)
group_size = models.IntegerField(default=3)
def __str__(self):
return self.get_course_block_display()
def save(self, *args, **kwargs):
super(Classroom, self).save(*args, **kwargs)
# overrides the default save function to parse the class list
studentList = []
studentList = self.class_list.split('\n')
for line in studentList:
line = line.strip('\r')
s = Student.objects.create(nickname = line, classroom = self)