如何在WTForms中生成动态字段？

问题描述

我想根据这个文档在WTForms中生成一个具有动态字段的表单

我有这个子类允许用户从列表中选择要购买的项目：

$ p $ class Item（Form）：
itmid = SelectField（'Item ID'）
qty = IntegerField（'Quantity'）

class F（Form）：
pass


购物商品将有多个类别，因此我想根据用户选择的类别生成一个动态选择字段：

  fld = FieldList（FormField（Item））
 fld.append_entry（）
  

但我得到以下错误：

  AttributeError：'UnboundField'对象有没有属性'append_entry'
  

我做错了什么，还是没有办法在WTForms ？

解决方案

def append_field（cls，name，field）：
setattr（cls，name，field）
返回cls

从窗体导入TestForm
form = TestForm.append_field（ do_you_want_fries_with_that，BooleanField（'fries'））（obj = db_populate_object）

我使用扩展类 BaseForm 为所有我的形式，并在类上有一个方便的append_field函数。

返回字段附加类，因为实例）不能附加字段。

I am trying to generate a form in WTForms that has dynamic fields according to this documentation http://wtforms.simplecodes.com/docs/1.0.2/specific_problems.html#dynamic-form-composition

I have this subform class which allows users to pick items to purchase from a list:

class Item(Form):
    itmid = SelectField('Item ID')
    qty = IntegerField('Quantity')

class F(Form):
        pass

There will be more than one category of shopping items, so I would like to generate a dynamic select field based on what categories the user will choose:

fld = FieldList(FormField(Item))
fld.append_entry()

but I get the following error:

AttributeError: 'UnboundField' object has no attribute 'append_entry'

Am I doing something wrong, or is there no way to accomplish this in WTForms?

解决方案

class BaseForm(Form):
    @classmethod
    def append_field(cls, name, field):
        setattr(cls, name, field)
        return cls

from forms import TestForm
form = TestForm.append_field("do_you_want_fries_with_that",BooleanField('fries'))(obj=db_populate_object)

I use the extended class BaseForm for all my forms and have a convenient append_field function on class.

Returns the class with the field appended, since instances (of Form fields) can't append fields.

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