這是Confused as to which Prototype helper to use的延續。我的代碼已被更新,以反映其他用戶的建議:混淆使用哪個Prototype助手(更新)
(模型)message.rb:
class Message < ActiveRecord::Base
after_create :destroy_old_messages
def old_messages
messages = Message.all(:order => 'updated_at DESC')
if messages.size >= 24
return messages[24..-1]
else
return []
end
end
protected # works without protected
def destroy_old_messages
messages = Message.all(:order => 'updated_at DESC')
messages[24..-1].each {|p| p.destroy } if messages.size >= 24
end
end
(視圖)index.html.erb:
<div id="messages">
<%= render :partial => @messages %>
</div>
<%= render :partial => "message_form" %>
(圖)_message。 html.erb:
<% div_for message do %>
<%= h message.created_at.strftime("%X") %> - <%= h message.author %><%= h message.message %>
<% end %>
(視圖)_message_form.html.erb:
<% remote_form_for :message, :url => { :action => "create" }, :html => { :id => 'message_form'} do |f| %>
<%= f.text_area :message, :size => "44x3" %><br />
<%= submit_to_remote 'submit_btn', 'submit', :url => { :action => 'create' } %><br />
<% end %>
(視圖)create.rjs:
page.insert_html :top, :messages, :partial => @message
page[@message].visual_effect :grow
page[:message_form].reset
flash[:notice]
flash.discard
# @old_messages.each do |m|
# page.remove(m.id)
# end
(控制器)messages_controller.rb:
class MessagesController < ApplicationController
def index
@messages = Message.all(:order => "created_at DESC")
respond_to do |format|
format.html
format.js
end
end
def new
@message = Message.new
respond_to do |format|
format.html
end
end
def create
@message = Message.new(params[:message])
# @old_messages = Message.old_messages
respond_to do |format|
if @message.save
flash[:notice] = 'message created.'
format.html { redirect_to(messages_url) }
format.js
else
format.html { render :action => "new" }
end
end
end
def update
@message = Message.find(params[:id])
respond_to do |format|
if @message.update_attributes(params[:message])
flash[:notice] = 'message updated.'
format.html { redirect_to(messages_url) }
format.js
else
format.html { render :action => "edit" }
end
end
end
def destroy
@message = Message.find(params[:id])
@message.destroy
respond_to do |format|
format.html { redirect_to(messages_url) }
format.js
end
end
end
隨着該模型中的old_messages方法外,所有註釋的代碼的均建議從previous post進行更改以完成此項工作。但是,只要我從控制器的create.rjs和@old_messages = Message.old_messages取消註釋最後三行,我甚至不能使用message_form部分提交消息。任何人都可以看到這裏有什麼問題?我只是想創建一個基本的應用程序來幫助我進一步理解rails和rjs。我將不勝感激任何建議或更正,你必須分享,感謝您閱讀我的文章。
請問您能告訴我們哪個錯誤? – 2010-03-09 19:00:45
參數:{「authenticity_token」=>「srg8coKfA7j/Boy1zMPMs9BTonQ4 + 5sPlGpfo/McKzI =」,「message」=> {「message」=>「please work!」},「submit_btn」=>「submit」} SQL 0.3ms的)SELECT姓名FROM SQLITE_MASTER WHERE類型= '表' AND NOT名稱= sqlite_sequence' NoMethodError(未定義的方法'old_messages'爲#<類別:0x7ffaaefdf9e8>): 應用程序/控制器/ messages_controller.rb:18 :在'創建' 這與上面的代碼未註釋。 – BasicObject 2010-03-09 19:22:12