为关联的 Profile 模型 Model Rails 4 接收 #<Profile:0x611b5d8> 的未定义方法“mood_id”答案

【问题标题】：Receiving undefined method `mood_id' for #<Profile:0x611b5d8> for associated Profile model Model Rails 4为关联的 Profile 模型 Model Rails 4 接收 #<Profile:0x611b5d8> 的未定义方法“mood_id”
【发布时间】：2016-04-12 19:08:43
【问题描述】：

我无法将个人资料模型连接到心情模型，然后将心情的 ID 保存到用户的个人资料中。如果您能帮我解决这个问题，我将不胜感激。

_mood_form.html.erb

<%= simple_form_for(@user, url: current_user, html: {multipart: true}, layout: :horizontal) do |f| %>
    <%= f.simple_fields_for :profile do |n| %>
        <%= n.label :mood_id, 'Select a mood' %>
        <%= n.collection_select :mood_id, Mood.all, :id, :name %>
        <%= f.submit 'Change Mood', class: 'btn btn-info-outline' %>
    <% end %>
<% end %>

profile.rb
belongs_to :mood

mood.rb
has_many :profiles

服务器开发日志

NoMethodError - undefined method `mood_id' for #<Profile:0x611b5d8>:
  activemodel (4.2.3) lib/active_model/attribute_methods.rb:433:in `method_missing'
  ransack (1.7.0) lib/ransack/helpers/form_builder.rb:10:in `value'
  actionview (4.2.3) lib/action_view/helpers/tags/collection_select.rb:16:in `block in render'
  actionview (4.2.3) lib/action_view/helpers/tags/collection_select.rb:16:in `render'
  actionview (4.2.3) lib/action_view/helpers/form_options_helper.rb:202:in `collection_select'
  actionview (4.2.3) lib/action_view/helpers/form_options_helper.rb:789:in `collection_select'
  app/views/users/shared/_mood_form.html.erb:4:in `block (2 levels) in _app_views_users_shared__mood_form_html_erb__906227000_76706760'
  actionview

迁移文件

class CreateMoods < ActiveRecord::Migration
  def change
    create_table :moods do |t|
      t.string :name
      t.string :mood
      t.references :profile, index: true, foreign_key: true

      t.timestamps null: false
    end
  end
end

【问题讨论】：

标签： ruby-on-rails ruby-on-rails-4 activerecord simple-form

【解决方案1】：

既然你有belongs_to :mood，你应该将mood_id整数字段添加到profiles数据库表中：

 class AddMoodToProfiles < ActiveRecord::Migration
   def change
     add_column :profiles, :mood_id, :integer
   end
 end

【讨论】：

糟糕。我显然已经筋疲力尽了，我显然忘记添加id了。谢谢。