django - 如何在Django模型的ManyToManyField中添加id(而不是对象)？

Question

模型.py:

class Employee(models.Model):
   name = models.CharField(max_length=100)

class Department(models.Model):
   name = models.CharField(max_length=100)
   employee = models.ManyToManyField(Employee, null=True, blank=True)

我需要将员工 ID(而不是员工对象)保存在“部门”模型的“员工”ManyToManyField 中。如何做到这一点？

views.py:

dept = Department(name=name)
dept.save()
employee_ids = [1,2]

Answer 1

我们可以使用方法add (Django Docs):

Adds the specified model objects to the related object set.

dept = Department.objects.create(name=name)
dept.employee.add(<b>*[1, 2]</b>)

或者方法set (Django Docs):

Replace the set of related objects

dept.employee.set(<b>[1, 2]</b>)

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Note that add(), create(), remove(), clear(), and set() all apply database changes immediately for all types of related fields. In other words, there is no need to call save() on either end of the relationship.