Django 动态嵌套 model forms

Question

Suppose I have the following models, where there is a 1:many relationship from Teacher to Course , and from Course to Student :

class Teacher(Model):
    name = CharField(max_length=64)
    degree = CharField(max_length=64)

class Course(Model):
    title = CharField(max_length=64)
    level = CharField(max_length=64)
    teacher = ForeignKey(Teacher, on_delete=CASCADE)

class Student(Model):
    name = CharField(max_length=64)
    year = CharField(max_length=64)
    course = ForeignKey(Course, on_delete=CASCADE)

If I want to have a "register teacher" page, where a user can input the details of a Teacher , and also be able to add any number of Course s with their corresponding details, and to each Course add any number of Student s, how could this be done? I am aware of ModelForm s, which would make constructing a basic form for a single instance of a model rather trivial, but how can I create a form or forms that essentially nests the models within each other, and allows for a dynamic number of Course and Student ?

For example, within the Teacher form, there is an "add Course" button, that adds another Course form under that Teacher , such that any details entered into it populate a Course that belongs to that Teacher , and then for each Course form, there is an "add Student" button that adds a Student form for a Student that belongs to that Course . How can I implement this dynamic and nested behavior?

Then if it is possible to make such a form, back on the Python side after the form is submitted, how will the data be organized? Or in other words, what will indicate to which Course each Student belongs?

Answer 1

You should look at Django ModelFormsets, it is used in those cases