动态 SelectField 验证失败，并显示:“不是有效的选择"； [英] Dynamic SelectField validation fails with: "Not a valid choice"

问题描述

这是我的代码，我无法通过 SelectField 上的无效选择"，无论是在创建表单中还是在编辑表单中...我作为选择传递的类别是 unicode，甚至所以我在 Form SelectField 中尝试了各种强制"设置

Here's my code, i can't get past the "not a valid choice" on the SelectField, being it in the creation form or the editing one... The categories i'm passing it as choices are unicode, even so i tried various "coerce" settings in the Form SelectField

class ProductsView(MyModelView):
create_template = '/admin/edit-products.html'
form = ProductForm

def create_form(self, model=None):
    form = self.form()
    choices = list(db.db.categories.find())
    choices.sort(key=lambda x: x['order'])
    sorted_choices = [(str(cat['name']), cat['name']) for cat in choices]
    print sorted_choices
    form.category.choices = sorted_choices
    if model:
        form.name.data = model['name']
        form.order.data = int(model['order'])
    return form

    def edit_form(self, obj):
    try:
        pk = self.get_pk_value(obj)
        if not pk:
            raise ValueError('Document does not have _id')
        model = db.db.products.find_one(pk)
        form = self.create_form(model)
        return form
    except Exception as ex:
        print ex
        flash(gettext('Failed to edit product. %(error)s', error=str(ex)),
              'error')

推荐答案

您可以创建自定义 SelectField 并覆盖 pre_validate 方法.像这样:

You can create your custom SelectField and overwrite pre_validate method. Like this:

class MySelectField(SelectField):

    def pre_validate(self, form):
        for v, _ in self.choices:
            if your validation:
                break
        else:
            raise ValueError(self.gettext('Not a valid choice'))

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