向 Django 表单选择小部件添加其他选项 [英] Add additional options to Django form select widget

问题描述

我有一个用于构建查询集过滤器的表单.该表单从数据库中提取项目状态选项.但是，我想添加其他选项，例如所有实时促销"……因此选择框将如下所示:

I have a form which I use to construct a queryeset filter. The form pulls in the project status options from the database. However, I wanted to add additional options, for example "All live promotions" ... so the select box would then look something like:

• 所有促销活动 *
• 所有实时促销活动 *
• 草稿
• 已提交
• 接受
• 已举报
• 已检查
• 所有已完成的促销活动 *
• 关闭
• 已取消

这里的*"是我想添加的，其他的来自数据库.

Here the '*' are the ones I'd want to add and the others come from the database.

这可能吗?

class PromotionListFilterForm(forms.Form):
    promotion_type = forms.ModelChoiceField(label="Promotion Type", queryset=models.PromotionType.objects.all(), widget=forms.Select(attrs={'class':'selector'}))
    status = forms.ModelChoiceField(label="Status", queryset=models.WorkflowStatus.objects.all(), widget=forms.Select(attrs={'class':'selector'})) 
    ...
    retailer = forms.CharField(label="Retailer",widget=forms.TextInput(attrs={'class':'textbox'}))

推荐答案

您将无法为此使用 ModelChoiceField.您需要恢复到标准的 ChoiceField，并在表单的 __init__ 方法中手动创建选项列表.类似的东西:

You won't be able to use a ModelChoiceField for that. You'll need to revert to a standard ChoiceField, and create the options list manually in the form's __init__ method. Something like:

class PromotionListFilterForm(forms.Form):
    promotion_type = forms.ChoiceField(label="Promotion Type", choices=(),
                                       widget=forms.Select(attrs={'class':'selector'}))
    ....

    EXTRA_CHOICES = [
       ('AP', 'All Promotions'),
       ('LP', 'Live Promotions'),
       ('CP', 'Completed Promotions'),
    ]

    def __init__(self, *args, **kwargs):
        super(PromotionListFilterForm, self).__init__(*args, **kwargs)
        choices = [(pt.id, unicode(pt)) for pt in PromotionType.objects.all()]
        choices.extend(EXTRA_CHOICES)
        self.fields['promotion_type'].choices = choices

您还需要在表单的 clean() 方法中做一些聪明的事情来捕捉这些额外的选项并适当地处理它们.

You'll also need to do something clever in the form's clean() method to catch those extra options and deal with them appropriately.

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