How to properly make relationships between models in Django?

Question

css

class Employee(models.Model):
    name = models.CharField('Имя сотрудника', max_length=50, blank=True)

class Post(models.Model):
    name = models.CharField('Название поста', max_length=50, blank=True)

class Duty(models.Model):
    date = models.DateField('Дата дежурства', auto_now=False, auto_now_add=False)

How should the Duty model be correctly supplemented so that an arbitrary number of pairs of Post values ​​can be attributed to it: Employee
How to do this correctly, I just can’t think of?
The practical meaning is this:
On the page you want to place a form that creates a Duty object, with several pairs of Post values: Employee

Answer 1

when he started to set the background th

th to thead? ...then and the gradient on thead hang

Answer 2

Add an "intermediate" model with three ForeignKeys to these models.

Answer 3

class Duty(models.Model):
    date = models.DateField('Дата дежурства', auto_now=False, auto_now_add=False)
    employee = models.ForeignKey(Employee)
    post = models.ForeignKey(Post)