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我以前问过这个问题，但搞砸了 OP。这方面的官方文档不是最好的，而且有点令人困惑。我正在尝试从反馈表中收集选项并将它们呈现在表单的下拉列表中，然后使用 collection_select 将它们保存在名为“answers”的表和名为“feedback_request”的列中：

<%= f.collection_select :feedback_request, Feedback.order(:feedback_option), :id, :feedback_request, {prompt: "Feedback"}, {class: "select large-1 behaviourForm"} %>

答案表：

  create_table "answers", force: :cascade do |t|
        t.integer  "user_id",             limit: 4
        t.string   "subject",             limit: 4
        t.string   "source",              limit: 45
        t.text     "description",         limit: 65535
        t.string   "significance",        limit: 45
        t.string   "feedback_request"
        t.datetime "created_at",                        null: false
        t.datetime "updated_at",                        null: false
    end

  add_index "answers", ["feedback_request"], name: "feedback_index"
  add_index "answers", ["significance"], name: "signif_index"
  add_index "answers", ["source"], name: "source_index"
  add_index "answers", ["subject"], name: "FK_HOM_MOD_idx"
  add_index "answers", ["user_id"], name: "teacher_answer_index"

反馈表

create_table "feedback", force: :cascade do |t|
    t.string "feedback_option", limit: 45
  end

楷模

feedback.rb

    class Feedback < ActiveRecord::Base
        self.table_name = 'feedback'
        has_many :answers, :class_name => 'Answer'
    end

answer.rb

    belongs_to :feedback, :class_name => 'Feedback', :foreign_key => :feedback_request

形式：

<%= simple_form_for @answer do |f| %>
   <%= f.collection_select :feedback_request, Feedback.order(:feedback_option), :id, :feedback_request, {prompt: "Feedback"}, {class: "select large-1 behaviourForm"} %><br>

    <%= f.text_field :Due, :id => "datepicker", placeholder: "Due", data: { no_turbolink: true }, class: "behaviourForm select large-1" %>

   <%= f.input :source, :as => :text, input_html: { :style=> 'width: 100%;', :rows => 2} %>

  <%= f.input :description, :label => "Comments", :as => :text, input_html: { :style=> 'width: 100%;', :rows => 2} %>


  <%= f.button :submit,'Create', class: "small button buttonSelect" %>   
<% end %>

这给了我在表单加载时出现以下错误：

**undefined method `feedback_request' for #<Feedback id: 1, feedback_option: "Curriculum Management">**

就像我说的，我检查了文档，但不清楚。任何指导都非常感谢，因为我正在撕扯我的头发。谢谢。

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1 回答 1

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<%= f.collection_select :feedback_request, Feedback.order(:feedback_option), :id, :feedback_request, {prompt: "Feedback"}, {class: "select large-1 behaviourForm"} %><br>

第四个参数:feedback_request是在您的每个反馈上调用以确定选项名称的方法。您可能希望:feedback_option改为这样。

编辑：第三个参数是将Feedback其值分配给的实例方法Answer#feedback_request。因此，如果您希望它成为:feedback_option字符串，请更改它。

<%= f.collection_select :feedback_request, Feedback.order(:feedback_option), :feedback_option, :feedback_option, {prompt: "Feedback"}, {class: "select large-1 behaviourForm"} %><br>
于 2016-09-17T16:49:48.400 回答