Question

此代码

new_hash = [{:id=>1,:name_t=>"Y/N"},{:id=>2,:name_t=>'Number'},{:id=>3,:name_t=>'Text'}]
collection_select(:question,:q_type, new_hash ,:id,:name_t )

正在抛出错误 undefined method ``name_t' for {:id=>1, :name_t=>"Y/N"}:Hash

让我发疯了

更新

我正在尝试向表单添加DRY静态下拉菜单

= form_for @question do |f|
  - if @question.errors.any?
    #error_explanation
      %h2= "#{pluralize(@question.errors.count, "error")} prohibited this question from being saved:"
      %ul
        - @question.errors.full_messages.each do |msg|
          %li= msg
  .row{:style=>"margin-bottom: 5px"}
    .col-xs-2
      = f.label :pm_type
    .col-xs-2
      = f.collection_select(:pm_type_id, PmType.all.where(:is_active => true), :id, :name) 
  .row{:style=>"margin-bottom: 5px"}
    .col-xs-2
      = f.label :proposition
    .col-xs-2
      = f.text_field :proposition
  .row{:style=>"margin-bottom: 5px"}
    .col-xs-2
      = f.label "Type"
    .col-xs-2

      -# ######## Code goes here ##########
      - new_hash = [{:id=>1,:name_t=>"Y/N"},{:id=>2,:name_t=>'Number'},{:id=>3,:name_t=>'Text'}]
      = collection_select(:question,:q_type, new_hash ,:id,:name_t )

  .row{:style=>"margin-bottom: 5px"}
    .col-xs-2
      = f.label "Weight"
    .col-xs-2
      = f.text_field :q_weight
  .row{:style=>"margin-bottom: 5px"}
    .col-xs-2
      = f.label "Active?"
    .col-xs-2
      = check_box_tag(:is_active, 1 ,true)
  .actions
    = f.submit 'Save'

Answer 1

根据文档here，collection_select的第五个参数应该是一种方法。

来自api-doc：

:value_method和:text_method参数是要在每个集合成员上调用的方法。

由于name_t是数组中元素的键，因此无法将其用作方法。

但你可以试试这个：

class MyType < Struct.new(:id, :name_t)
end

new_hash = [MyType.new(1,"Y/N"),MyType.new(2,"Number"),MyType.new(2,"Text")]
p new_hash[0].name_t

Answer 2

感谢您的帮助！我在查看文档时找到了select方法，最后执行了以下操作：

select(:question,:q_type, [["Y/N",1],['Number',2],['Text',3]], {} )

{：id =＆gt; 1，：name_t =＆gt;“Y / N”}的未定义方法`name_t'：哈希

2 个答案: