有人可以为 pluginaweek - statemachine 提供一个活动记录示例吗？答案

【问题标题】：Can somebody give an active record example for pluginaweek - statemachine?有人可以为 pluginaweek - statemachine 提供一个活动记录示例吗？
【发布时间】：2012-03-04 23:05:07
【问题描述】：

有人可以举一个简单的例子来说明如何将pluginaweek state_machine 用于具有活动记录的票证模型吗？我不理解文档中的复杂示例。

示例状态：

新 -> 接受、拒绝、反馈
接受 -> 已解决或反馈
反馈 -> 接受或解决

【问题讨论】：

标签： ruby-on-rails activerecord state-machine

【解决方案1】：

票证模型示例（未测试）

class Ticket < ActiveRecord::Base
  attr_accessible :name, :description
  attr_accessible :state_event
  validates :name, :presence => true

  state_machine :initial => :new do

    event :accept do 
      transition [:new, :feedback] => :accepted
    end

    event :decline do
      transition :new => :declined
    end

    event :feedback do
      transition [:new, :accepted] => :feedbacked
    end

    event :solve do
      transition [:accepted, :feedback] => :solved
    end
  end
end

获取表单中所有可能的转换

<%= f.collection_select :state_event, @ticket.state_transitions, :event, :human_to_name, :include_blank => @ticket.human_state_name %>

获取工单状态：<%= ticket.state %>

以链接形式获取所有可能的工单转换：

<% ticket.state_transitions.each do |transition| %>
    <%= link_to transition.event, ticket_path(ticket, ticket: {:state_event => transition.event}), :method => :put %>
<% end %>

列出所有可能的转换以在控制器中过滤

<ul>
  <li class="<%= 'active' if params[:state].blank? %>"><%= link_to 'All', tickets_path %></li>
  <% Ticket.state_machine.states.each do |state| %>
    <li class="<%= 'active' if params[:state] == state.name.to_s  %>">
      <%= link_to state.name, tickets_path(:state => state.name) %>
    </li>
  <% end %>
</ul>

class TicketsController extends ApplicationController
  ...
  def index
    @tickets = Ticket.where("state = ?", params[:state])
    ...

【讨论】：