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

问题描述

我目前正在使用 WTFORMS 创建一个动态选择字段，但是它从不提交并且验证失败并出现以下错误.

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

我的字段是这样创建的:

My Field is created like this:

area = SelectField()

在视图中，我像这样从数据库中获取选项:

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()]

但是，如果我创建静态选项，它会起作用.

It works however if i create static options.

推荐答案

我的猜测是 Area.id 是一个 int - 当数据从客户端返回时WTForms 将其视为字符串，除非将可调用对象传递给 wtforms.fields.SelectField 构造函数:

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)

或者，如果您使用 SQLAlchemy，您可以使用 wtforms.ext.sqlalchemy.fields.QuerySelectField (wtforms_sqlalchemy(如果您使用的是 WTForms 3+):

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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