Django表单：来自外键的引用字段

Question

I'm making a task tracker webapp ( the full source code is also available) and I have a database structure where each task has a title, a description, and some number of instances, that can each be marked incomplete/incomplete:

class Task(models.Model):
    title = OneLineTextField()
    description = models.TextField(blank=True)


class TaskInstance(models.Model):
    task = models.ForeignKey(Task, on_delete=models.CASCADE)
    is_complete = models.BooleanField()

The task and the instances can be shared separately, although access to the instance should imply read access to the task. This is intended for classroom situations, where the teacher creates a task and assigns it to their students.

class TaskPermission(models.Model):
    task = models.ForeignKey(Task, on_delete=models.CASCADE, related_name='permissions')
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='task_permissions_granted')
    shared_by = models.ForeignKey(User, on_delete=models.PROTECT, null=True, related_name='task_permissions_granting')
    can_edit = models.BooleanField(default=False)

    class Meta:
        unique_together = 'task', 'user', 'shared_by',


class TaskInstancePermission(models.Model):
    task_instance = models.ForeignKey(TaskInstance, on_delete=models.CASCADE, related_name='permissions')
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='task_instance_permissions_granted')
    shared_by = models.ForeignKey(User, on_delete=models.PROTECT, null=True, related_name='task_instance_permissions_granting')
    can_edit = models.BooleanField(default=False)

    class Meta:
        unique_together = 'task_instance', 'user', 'shared_by',

My question is how to create a form for TaskInstance s with fields for its is_complete , as well as its Task 's title and description . Would something like this work? Or would I need to implement my own save and clean methods?

class TaskForm(ModelForm):
    class Meta:
        model = TaskInstance
        fields = ('is_complete', 'task__title', 'task__description')

Answer 1

I think inlineformset_factory is what I'm looking for!

Actually, it does not seem to be useful: it is for multiple forms of the same type, not different types...