Django 管理外键下拉字段列表仅“测试对象”

发布于 2024-11-04 16:00:36 字数 395 浏览 2 评论 0原文

我有这两个类：

class Test(models.Model):
    id = models.AutoField(primary_key=True)
    user = models.ForeignKey(User)
    groups = models.ManyToManyField(Group)

class TestSubjectSet(models.Model):
    id =  models.AutoField(primary_key=True)
    test = models.ForeignKey(Test)
    subject = models.ManyToManyField(Subject)

TestSubjectSet 表单测试列表仅显示字符串“测试对象”。

原文

I have these two classes:

class Test(models.Model):
    id = models.AutoField(primary_key=True)
    user = models.ForeignKey(User)
    groups = models.ManyToManyField(Group)

class TestSubjectSet(models.Model):
    id =  models.AutoField(primary_key=True)
    test = models.ForeignKey(Test)
    subject = models.ManyToManyField(Subject)

The TestSubjectSet form test list shows only string "test object".

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染墨丶若流云 2024-11-11 16:00:36

您必须在模型类中添加 __unicode__(self) 或 __str__(self) 方法。

http:// docs.djangoproject.com/en/dev/ref/models/instances/?from=olddocs#django.db.models.Model.unicode

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A君 2024-11-11 16:00:36

有同样的问题。添加

def __str__(self):
    return self.user

解决了问题。

Had the same problem. Adding

def __str__(self):
    return self.user

solved the problem.

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小矜持 2024-11-11 16:00:36

有时您希望从 str 函数返回不同的信息，但希望在管理的下拉列表中显示一些不同的信息。那么上述解决方案将不起作用。

您可以通过像这样子类化 forms.ModelChoiceField 来做到这一点。

class TestChoiceField(forms.ModelChoiceField):
 def label_from_instance(self, obj):
     return "Test: {}".format(obj.id)

然后您可以覆盖 formfield_for_foreignkey

def formfield_for_foreignkey(self, db_field, request, **kwargs):
  if db_field.name == 'test':
    return TestChoiceField(queryset=Test.objects.all())
  return super().formfield_for_foreignkey(db_field, request, **kwargs)

Sometimes you want to have different info returned from str function but Want to show some different info in the dropdown of admin. Then Above mentioned solution won't work.

You can do this by subclassing forms.ModelChoiceField like this.

class TestChoiceField(forms.ModelChoiceField):
 def label_from_instance(self, obj):
     return "Test: {}".format(obj.id)

You can then override formfield_for_foreignkey

def formfield_for_foreignkey(self, db_field, request, **kwargs):
  if db_field.name == 'test':
    return TestChoiceField(queryset=Test.objects.all())
  return super().formfield_for_foreignkey(db_field, request, **kwargs)

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