Django，如何从modelform的choicefield中删除空白选择？ [英] Django, how to remove the blank choice from the choicefield in modelform?

问题描述

我创建了一个带有外键的模型：

I created a model with a foreign key in it:

class Book(models.Model):
    library = models.ForeignKey(Library, null=False, blank=False)
    ...

，然后我创建了一个带有ModelForm的表单以显示给用户：

and then I created a form with a ModelForm to display to the users:

class BookSubmitForm(ModelForm):
    class Meta:
        model = Book

，当我以以下形式显示页面时获得库选项，还获得默认出现的空白（--------）选项。

and when I display the page with the form I get the Library choices but also the blank (--------) choice that comes by default.

我认为通过null = False和blank = False在模型中可以摆脱ModelForm中的空白选择，但没有。我该怎么办才能只在列表中有实际选择，而不是那个？

I thought by having null=False and blank=False in the model that would get rid of that blank choice in the ModelForm but no. What can I do to only have actual choices in the list and not that one?

推荐答案

请参见 ModelChoiceField 。您必须将empty_label设置为None。因此，您的代码将类似于：

See ModelChoiceField. You have to set empty_label to None. So your code will be something like:

class BookSubmitForm(ModelForm):
    library = ModelChoiceField(queryset=Library.objects, empty_label=None)

    class Meta:
        model = Book    

编辑：将字段名称更改为小写

changed the field name to lower case

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