如何向simple_form添加帮助器取决于属性类型？

This is my form:

这是我的表格：

= simple_form_for Risk.new do |f|
  = f.input :risk_id, as: :hidden, input_html: {value: risk.id}
  - if risk.answer_type.boolean?
    = f.input :answer, as: :radio_buttons
  - elsif risk.answer_type.string?
    = f.input :answer, as: :string
  - elsif risk.answer_type.integer?
    = f.input :answer, as: :integer
= simple_form_for