Django 管理员。限制多对多字段的选择

Question

我有一个多对多字段。我想限制管理员在其 M2M 小部件中显示的选择。

我有一个这样的模型:

class A(models.Model):
    b_field = models.ManyToManyField(B)

class B(models.Model):
    available = models.BooleanField()

我如何将小部件中显示的 B 对象仅限于拥有 available = True 的人?

Answer 1

limit_choices_to选项可能会帮助你，

Sets a limit to the available choices for this field when this field is rendered using a ModelForm or the admin (by default, all objects in the queryset are available to choose). Either a dictionary, a Q object, or a callable returning a dictionary or Q object can be used.

例如，

class A(models.Model):
    b_field = models.ManyToManyField(B, limit_choices_to={'available': True})