不是动态选择字段WTFORMS的有效选择 [英] Not a Valid Choice for Dynamic Select Field WTFORMS

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问题描述

我现在正在创建一个使用WTFORMS的动态选择字段,但是它从不提交并且没有通过下面的错误验证。

 不是有效的选择

我的字段是这样创建的:

  area = SelectField()

和在视图中,我从数据库中抓取选项,如下所示:

  form = MytestForm()
表单。 area.choices = [(a.id,a.name)for a Area.objects.all()]


$ b $如果我创建了静态选项,它可以工作。

解决方案

我的猜测是 Area。当数据从客户端返回时,它被WTForms视为一个字符串,除非一个可调用的字符串是一个 int 传递给 coerce 关键字参数#wtforms.fields.SelectField> wtfor ms.fields.SelectField 构造函数:

  area = SelectField(coerce = int) 

或者,如果您正在使用SQLAlchemy,则可以使用wtforms.ext.sqlalchemy.fields.QuerySelectField wtforms_sqlalchemy 如果您使用的是WTForms 3 +):

$ p $ c $ area $ QuerySelectField(query_factory = Area.objects.all
get_pk = lambda a:a.id,
get_label = lambda a:a.name)


I currently am creating a dynamic select field using WTFORMS, however it never submits and fails the validation with the following error.

Not a valid choice

My Field is created like this:

area = SelectField()

and in the view, i am grabbing the options from the db like so:

form = MytestForm()
form.area.choices = [(a.id, a.name) for a in Area.objects.all()]

It works however if i create static options.

解决方案

My guess is that Area.id is a int - when data comes back from the client it is treated as a string by WTForms unless a callable is passed to the coerce keyword argument of the wtforms.fields.SelectField constructor:

area = SelectField(coerce=int)

Alternately, if you are using SQLAlchemy you could use wtforms.ext.sqlalchemy.fields.QuerySelectField (wtforms_sqlalchemy if you are using WTForms 3+):

area = QuerySelectField(query_factory=Area.objects.all,
                            get_pk=lambda a: a.id,
                            get_label=lambda a: a.name)

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