ruby-on-rails – 在Rails表单选择框中设置HTML id属性

这是我的表格中的一部分：

<%= f.fields_for :items do |builder| %>
  <%= builder.label :description %><br />
  <%= builder.text_field :description %><br />
  <%= builder.label :material %><br />
  <%= builder.select :material,@letters.map { |l| [l.material,l.material] },:id => "material_field" %><br />
  <%= builder.label :height %><br />
  <%= builder.select :height,@letters.map { |l| [l.height,l.height] },:id => "height_field" %><br />
  <%= builder.label :thickness %><br />
  <%= builder.select :thickness,@letters.map { |l| [l.thickness,l.thickness] },:id => "thickness_field" %><br />

  <%= builder.label :quantity %><br />
  <%= builder.text_field :quantity,:id => "quantity_field" %>
  <%= builder.link_to_remove "Remove this item" %>
<% end %>

：id => “quantity_field”方法适用于文本字段,但不适用于选择字段.查看HTML源我获得了材料文本框的“estimate_items_attributes_0_material”id.

这是一个奇怪的不一致.任何帮助将不胜感激.