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我想在迁移中添加两列，为邮箱 gem 提供通知。当我将两者都放入创建通知的迁移中，然后运行它通过的迁移时。然后我将它们输入到表单中，当我提交它们时没有错误，并且日志显示它接受了它们。出于某种原因，当我尝试展示它们时，它们没有出现，唯一展示的是作为主体和身体迁移一部分的原始事物。我的问题是如何向此迁移添加列？

这是将我的 lat 和 long 两列添加到通知部分的迁移。

 # This migration comes from mailboxer_engine (originally 20110511145103)
 class CreateMailboxer < ActiveRecord::Migration
   def self.up    
   #Tables
     #Conversations
      create_table :conversations do |t|
        t.column :subject, :string, :default => ""
        t.column :created_at, :datetime, :null => false
        t.column :updated_at, :datetime, :null => false
     end    
      #Receipts
     create_table :receipts do |t|
       t.references :receiver, :polymorphic => true
       t.column :notification_id, :integer, :null => false
       t.column :read, :boolean, :default => false
       t.column :trashed, :boolean, :default => false
       t.column :deleted, :boolean, :default => false
       t.column :mailbox_type, :string, :limit => 25
       t.column :created_at, :datetime, :null => false
       t.column :updated_at, :datetime, :null => false
     end    
      #Notifications and Messages
     create_table :notifications do |t|
       t.column :type, :string
       t.column :body, :text
       t.column :subject, :string, :default => ""
       t.column :lat, :text
       t.column :long, :text
       t.references :sender, :polymorphic => true
       t.references :object, :polymorphic => true
       t.column :conversation_id, :integer
       t.column :draft, :boolean, :default => false
       t.column :updated_at, :datetime, :null => false
       t.column :created_at, :datetime, :null => false
     end    


   #Indexes
     #Conversations
     #Receipts
     add_index "receipts","notification_id"

     #Messages  
     add_index "notifications","conversation_id"

   #Foreign keys    
     #Conversations
     #Receipts
     add_foreign_key "receipts", "notifications", :name => "receipts_on_notification_id"
     #Messages  
     add_foreign_key "notifications", "conversations", :name =>  "notifications_on_conversation_id"
   end

   def self.down
   #Tables      
     remove_foreign_key "receipts", :name => "receipts_on_notification_id"
     remove_foreign_key "notifications", :name => "notifications_on_conversation_id"

   #Indexes
     drop_table :receipts
     drop_table :conversations
     drop_table :notifications
   end
 end

我的显示视图看起来像

 %h1= conversation.subject
 %ul
   = content_tag_for(:li, conversation.receipts_for(current_user)) do |receipt|
     - message = receipt.message
     %h3= message.subject
     %p= message.body
     %p= message.lat
     %p= message.long

 = render 'messages/form', conversation: conversation

这就是控制台中出现的内容，对于经纬度，您会看到它显示为空

   Notification Load (0.1ms)  SELECT "notifications".* FROM "notifications" ORDER BY   "notifications"."id" DESC LIMIT 1
 --- !ruby/object:Message
 attributes:
   id: 4
   type: Message
   body: game
   subject: wiz
   lat: !!null 
   long: !!null 
   sender_id: 1
   sender_type: User
   conversation_id: 2
   draft: false
   updated_at: 2013-03-10 04:37:54.984277000Z
   created_at: 2013-03-10 04:37:54.984277000Z
   notified_object_id: !!null 
   notified_object_type: !!null 
   notification_code: !!null 
   attachment: !!null 
  => nil
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1 回答 1

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我不确定我是否完全理解您在做什么，但听起来您可能没有将两个新列添加到 attr_accessible 并且因此它们没有被保存。这是我要检查的第一件事（它在模型中）。

否则，请转到控制台并查看您的新列是否存在并查看其中是否有数据。这将帮助您找到问题所在。

于 2013-03-09T11:19:37.083 回答