如何在 simple_form gem 中使用 Bootstrap 的输入组

环境

• 红宝石2.5.1
• 轨道 5.2.1
• 简单表格4.0.1

目前的行为

我按照中的例子http://simple-form-b​​ootstrap.plataformatec.com.br/examples/input_group http://simple-form-bootstrap.plataformatec.com.br/examples/input_group

我从<%= simple_form_for app, wrapper: :input_group do |f| %>并得到Couldn't find wrapper with name input_group，所以我取消注释

config.wrappers :input_group, tag: 'div', class: 'form-group', error_class: 'form-group-invalid', valid_class: 'form-group-valid' do |b|
    b.use :html5
    b.use :placeholder
    b.optional :maxlength
    b.optional :minlength
    b.optional :pattern
    b.optional :min_max
    b.optional :readonly
    b.use :label, class: 'form-control-label'
    b.wrapper :input_group_tag, tag: 'div', class: 'input-group' do |ba|
      ba.optional :prepend
      ba.use :input, class: 'form-control', error_class: 'is-invalid', valid_class: 'is-valid'
      ba.optional :append
    end
    b.use :full_error, wrap_with: { tag: 'div', class: 'invalid-feedback d-block' }
    b.use :hint, wrap_with: { tag: 'small', class: 'form-text text-muted' }
  end

in simple_form_bootstrap.rb

And get undefined method为类添加'SimpleForm::Inputs::StringInput'反而。

关于这个的问题<%= f.input :subdomain, append: "example.com" %>

我该如何使用它，这是否支持 simple_form ？不知道他们为什么注释掉那段代码。

create config/initializers/simple_form_component.rb

module InputGroup
  def prepend(wrapper_options = nil)
    span_tag = content_tag(:span, options[:prepend], class: "input-group-text")
    template.content_tag(:div, span_tag, class: "input-group-prepend")
  end

  def append(wrapper_options = nil)
    span_tag = content_tag(:span, options[:append], class: "input-group-text")
    template.content_tag(:div, span_tag, class: "input-group-append")
  end
end

# Register the component in Simple Form.
SimpleForm.include_component(InputGroup)

Source https://github.com/rafaelfranca/simple_form-bootstrap/blob/5a876154e902126e0d5e2c546f07da90c6c37c6c/lib/components/input_group_component.rb