查询由状态机状态的Rails 3

我使用的转换宝石创造在我的模型状态机设置像这样：查询由状态机状态的Rails 3

require 'transitions' 

class Batch < ActiveRecord::Base 
    include Transitions 

    state_machine do 
    state :pending 
    state :completed 


    event :change_state do 
     transitions :to => :completed, :from => [:pending] 
    end 

    end 


end

我要查询的模式来获取有所有的记录某些国家如：

Batch.where :current_state => :pending

但是，这似乎并没有工作，我无法在此找到文档。有谁知道如何做到这一点？（我相信这可能只是无法找到它）在此先感谢！

编辑

运行尾-n development.log给我：

ActionView::Template::Error (SQLite3::SQLException: no such column: batches.current_state: SELECT "batches".* FROM "batches" WHERE "batches"."user_id" = 1 AND "batches"."current_state" = 'pending'): 
    3: <%= link_to 'New Batch', new_batch_path %> 
    4: 
    5:                  
    6: <% unless @pending_batches.length < 1 %> 
    7: You have <%= @pending_batches.length %> batches pending on these urls: 
    8: <% @pending_batches.each do |batch| %> 
    9:  <%= batch.url %>   
    app/views/batches/index.html.erb:6:in `_app_views_batches_index_html_erb___355556540_17724200__911230187' 
    app/controllers/batches_controller.rb:8:in `index' 

Rendered /Users/dshipper/.rvm/gems/[email protected]/gems/actionpack-3.0.9/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.5ms) 
    Batch Load (0.5ms) SELECT "batches".* FROM "batches" WHERE "batches"."user_id" = 1 AND "batches"."current_state" = 'pending' 
SQLite3::SQLException: no such column: batches.current_state: SELECT "batches".* FROM "batches" WHERE "batches"."user_id" = 1 AND "batches"."current_state" = 'pending' 
Rendered /Users/dshipper/.rvm/gems/[email protected]/gems/actionpack-3.0.9/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (6.6ms) 
Rendered /Users/dshipper/.rvm/gems/[email protected]/gems/actionpack-3.0.9/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (16.1ms) 
    SQL (0.2ms) SELECT name 
FROM sqlite_master 
WHERE type = 'table' AND NOT name = 'sqlite_sequence' 

    Batch Load (0.3ms) SELECT "batches".* FROM "batches" HAVING "batches"."current_state" = 'pending' 
SQLite3::SQLException: a GROUP BY clause is required before HAVING: SELECT "batches".* FROM "batches" HAVING "batches"."current_state" = 'pending'

运行的grep 'current_state DB/schema.rb' 返回任何结果。我期望，因为没有实际的列名为current_state，记录的状态由状态机管理（不确定它确切存储状态的位置）。

来源

2011-07-26 dshipper

tail -n 500 development.log，grep'current_state db/schema.rb – Anatoly

该命令不起作用（我在Leopard上），但我将其更改为：tail -n 500 development.log | grep'current_state db/schema.rb'并且没有返回结果 – dshipper

这是两个不同的系统命令 – Anatoly

我还在研究状态机，虽然我还没有在我的项目中实现它，但我发现这可能会有所帮助。

确保您的Gemfile包括

gem "transitions", :require => ["transitions", "active_record/transitions"]

确保你的模型具有
```
include ActiveRecord::Transitions 
```
，而不是仅仅
```
include Transitions 
```
，它有一个名为“列状态'这一点是国家坚持的地方。

的问题似乎已经记录在这里：

http://dev.netizer.pl/transitions-state-machine-for-rails-3.html/comment-page-1#comment-41

而且在GitHub上的文档还概述了Rails的

http://github.com/qoobaa/transitions

使用设置w ^第i个Rails的

这进入你的Gemfile：

宝石 “过渡”，：要求=> [ “转换”， “active_record /转换”]

......这到您的AR模型：

包括的ActiveRecord ::转变

关于持久性的注意事项

用于保持模型状态的属性被命名为state（真的！），它应该是一个足够宽的字符串列，以适应您最长的状态名称。还应该提到#save！在每一次成功事件后都会被调用

希望这是有益的，祝你好运！

来源

2011-08-18 08:33:08 Tonys

查询由状态机状态的Rails 3

回答

http://github.com/qoobaa/transitions

使用设置w ^第i个Rails的

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