Django管理多对多逆转？

Question

回答问题Django管理员ManyToMany内联"没有ForeignKey to"错误是指Django Admin文档.给出的模型有:

class Person(models.Model):
    name = models.CharField(max_length=128)

class Group(models.Model):
    name = models.CharField(max_length=128)
    members = models.ManyToManyField(Person, related_name='groups')

内联管理类是:

class MembershipInline(admin.TabularInline):
    model = Group.members.through

class PersonAdmin(admin.ModelAdmin):
    inlines = [MembershipInline,]

class GroupAdmin(admin.ModelAdmin):
    inlines = [MembershipInline,]
    exclude = ('members',)

...允许从"个人"页面管理组成员资格,但不能从"组"页面管理.但是,如果管理员只想从"组"页面管理成员,该怎么办？摆脱这一exclude行将允许两个页面管理关系,但Django文档(可能不正确)说"你必须告诉Django的管理员不显示这个小部件".他们可能的意思是你"应该"告诉Django的管理员不要显示它 - 如果你不这样做会发生什么不好,但这是多余的.

因此,如果不更改模型,是否可以从"个人"页面而不是"组"页面中排除成员资格窗口小部件？两个明显的尝试:

class PersonAdmin(admin.ModelAdmin):
    inlines = [MembershipInline,]
    exclude = ('Group.members',)

和

class PersonAdmin(admin.ModelAdmin):
    inlines = [MembershipInline,]
    exclude = ('groups',)

(使用related_name模型中的第二个)失败并显示错误:

'PersonAdmin.exclude' refers to field 'groups' that is missing from the form.

是的,该模型可以改变把ManyToManyField下Person.但由于它是一种对称关系,因此无需更改数据库模式就无法从Person或Group(但不是两者)管理它的逻辑原因.Django Admin可以从组页面管理组成员身份并将其从人员页面中排除吗？

Answer 1

您没有提供此声明的参考：

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Django 文档（可能不正确）说“您必须告诉 Django\xe2\x80\x99s 管理员不要显示此小部件”。

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所以我只能参考Django 的当前（1.10）文档。目前它提到了管理中的ManyToMany字段：

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Django 在定义关系的模型上显示多对多字段的管理小部件（在本例中为Group）。如果你想使用内联模型来表示多对多关系，你必须告诉 Django\xe2\x80\x99s admin 不要显示这个小部件 - 否则你最终会在管理页面上出现两个小部件来管理关系。

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因此，针对您的正确说法：

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But since it is a symmetric relationship, there is no logical reason why it could not be managed from either Person or Group (but not both) without having to change the database schema.

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the reason is that the many-to-many relationship has to be defined somewhere; you have chosen to define it on the Group model, so that determines the default admin behaviour. If you want to move it, then you\'ll need to do a database migration to make that happen.

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If, on the other hand, you want this documented behaviour to be different without changing your use of it \xe2\x80\x94 you don\'t seem to be asking a question that fits at StackOverflow. Better to report a bug with the program at the project\'s bug tracker, asking for a change in the software\'s behaviour.

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