嵌套在 content_tag 块内的 Content_tag 块 - 表单生成器

Question

我正在尝试创建一个 Rails FormBuilder 来使用引导样式设置表单样式：

<div class="form-group has-error">
  <label for="exampleInputEmail1">Email address</label>
  <div class="input-group>
    <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Enter email">
    <span class="input-group-addon glyphicon glyphicon-user"></span>
  </div>
  <p class="help-block>can't be blank</p>
</div>

当我只有一个 div 标签时，我就能让表单生成器工作（不包括传统引导表单的输入组）。我的问题是，我无法使用类为“input-group”的 div 获取嵌套的 content_tag ”才能正常工作。我尝试添加元素并将 content_tag 包装在捕获中，但无济于事。

class LargeFormBuilder < ActionView::Helpers::FormBuilder
  include ActionView::Helpers::TagHelper
  include ActionView::Helpers::CaptureHelper
  include ActionView::Helpers::TextHelper

  attr_accessor :output_buffer

  %w(text_field text_area email_field password_field).each do |form_method|
    define_method(form_method) do |*args|
      attribute = args[0]
      options = args[1] || {}
      options[:label] ||= attribute
      options[:class] ||= "form-control input-lg"
      label_text ||= options.delete(:label).to_s.titleize
      content_tag(:div, class: "form-group #{'has-error' if !object.errors[attribute].empty?}") do
        concat label(attribute, label_text, class: "control-label")
        concat (
            content_tag(:div, class: "input-group") do
              concat super(attribute, options)
              concat content_tag(:span, "", class: "input-group-addon glyphicon glyphicon-user")
            end
         )
        concat errors_for_field(attribute)
      end
    end
  end

  def errors_for_field(attribute, options={})
    return "" if object.errors[attribute].empty?
    content_tag(:p, object.errors[attribute].to_sentence.capitalize, class: "help-block")
  end

end

Answer 1

更简单的是，事实上您不需要使用concat您只需使用即可以+更清晰的方式实现相同的结果，只需确保第一个字符串是html_safe

content_tag(:div, class: "form-group #{'has-error' if !object.errors[attribute].empty?}") do
  label(attribute, label_text, class: "control-label").html_safe + \
  content_tag(:div, class: "input-group") do
    concat super(attribute, options)
    concat content_tag(:span, "", class: "input-group-addon glyphicon glyphicon-user")
  end + \
  errors_for_field(attribute)
end

以及更高的可读性

content_tag(:div, class: "form-group #{'has-error' if !object.errors[attribute].empty?}") do
  label_html = label(attribute, label_text, class: "control-label")

  input_html = content_tag(:div, class: "input-group") do
    concat super(attribute, options)
    concat content_tag(:span, "", class: "input-group-addon glyphicon glyphicon-user")
  end

  error_html = errors_for_field(attribute)

  label_html.html_safe + input_html + error_html
end