无法在Rails中的控制器中访问模型方法

Question

在我的Rails应用程序中，我有一个控制器tickets_controller.rb和model ticket.rb。为了创建一票，我有以下形式，

<%= form_for(@ticket) do |f| %> 
    <% if @ticket.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@ticket.errors.count, "error") %> prohibited this ticket from being saved:</h2> 

     <ul> 
     <% @ticket.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <%= f.label :ref_no, "Reference Number"%><br/> 
    <%= f.text_field :ref_no%><br /> 

    <%= f.label :category, "Type of Request"%><br/> 
    <%= f.text_field :category_id %><br /> 

    <%= f.label :issue, "Issue"%><br/> 
    <%= f.text_area :issue%><br /> 

    <%= f.label :ticket_priority, "Priority level"%><br/> 
    <%= f.text_field :ticket_priority_id %><br /> 

    <%= f.label :ticket_status, "Current Status"%><br/> 
    <%= f.text_field :ticket_status_id %><br /> 

    <%= f.label :project, "Project"%><br/> 
    <%= f.text_field :project_id %><br /> 

    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %> 

我要创建在Form_Load（门票/新）唯一的随机参考数，它应该被追加到参考号码文本字段。在创建新的参考号码时，应该检查票据表是否有重复。所以，我有以下的模型，

ticket.rb

class Ticket < ActiveRecord::Base 

    attr_accessible :issue, :ticket_status_id, :ticket_priority_id, :ref_no, :category_id, :project_id 
    has_many :ticket_statuses , :through => :ticket_histories 
    has_one :ticket_priority 
    belongs_to :user 

    before_create :generate_token 

    protected 


    def generate_num 
    self.token = loop do 
     random_token = random(1000000000) 
     break random_token unless Ticket.exists?(:ref_no => random_token) 
    end 
    end 

end 

和

tickets_controller.rb

class TicketsController < ApplicationController 
    before_filter :authenticate_user! 
    #load_and_authorize_resource 

    def index 
    @tickets = Ticket.all 

    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render :json => @tickets } 
    end 
    end 


    def show 
    @ticket = Ticket.find(params[:id]) 

    respond_to do |format| 
     format.html # show.html.erb 
     format.json { render :json => @ticket } 
    end 
    end 


    def new 
    @ticket = Ticket.new 

    @ref_no = Ticket.generate_num 

    @categories = Category.all 
    @status = TicketStatus.first 
    @priorities = TicketPriority.all 
    respond_to do |format| 
     format.html # new.html.erb 
     format.json { render :json => @ticket } 
    end 
    end 


    def edit 
    @ticket = Ticket.find(params[:id]) 
    end 


    def create 
    @ticket = Ticket.new(params[:ticket]) 
    respond_to do |format| 
     if @ticket.save 
     format.html { redirect_to @ticket, :notice => 'Ticket was successfully created.' } 
     format.json { render :json => @ticket, :status => :created, :location => @ticket } 
     else 
     format.html { render :action => "new" } 
     format.json { render :json => @ticket.errors, :status => :unprocessable_entity } 
     end 
    end 
    end 

    def update 
    @ticket = Ticket.find(params[:id]) 

    respond_to do |format| 
     if @ticket.update_attributes(params[:ticket]) 
     format.html { redirect_to @ticket, :notice => 'Ticket was successfully updated.' } 
     format.json { head :no_content } 
     else 
     format.html { render :action => "edit" } 
     format.json { render :json => @ticket.errors, :status => :unprocessable_entity } 
     end 
    end 
    end 


    def destroy 
    @ticket = Ticket.find(params[:id]) 
    @ticket.destroy 

    respond_to do |format| 
     format.html { redirect_to tickets_url } 
     format.json { head :no_content } 
    end 
    end 
end 

当我运行我的应用程序，我得到了跟随错误。谁能帮忙？

NoMethodError in TicketsController#new 

undefined method `generate_num' for #<Class:0x7f5cdc1f21c0> 

Rails.root: /home/local/Rajesh/ticket_system 
Application Trace | Framework Trace | Full Trace 

app/controllers/tickets_controller.rb:27:in `new' 

Answer 1

您已经定义和实例方法和你正在使用的对象

@ticket.generate_num 

Answer 2

更改模型方法generate_num到self.generate_num使用

类

调用方法调用它。

def self.generate_num 
    token = loop do 
     random_token = random(1000000000) 
     break random_token unless Ticket.exists?(:ref_no => random_token) 
    end 
end