祖先宝石'未定义的方法'错误 [英] Ancestry Gem 'undefined method' error

问题描述

我正在使用Ancestry Gem，我得到了一个未定义的方法，用以下代码＃排列＃< Array：0x007f8d58e58700> 错误：

 <％= @ shipmgr_carriers.arrange（：order => name）％> 
  

然而，当我输出 @shipmgr_carriers 我得到一个带有祖先的数组：

  [＃< Shipmgr :: Carrier id：9，name：testing，status ：nil，created_at：2012-01-16 22:44:28，updated_at：2012-01-16 22:44:28，ancestry：nil> ;,＃< Shipmgr :: Carrier id：10，name ：test，status：nil，created_at：2012-01-16 22:44:28，updated_at：2012-01-16 22:44:28，血统：9>] 
  

任何人都可以告诉我为什么我无法调用数组变量的.arrange方法吗？

解决方案

我没有使用过Ancestry，但它看起来像它将 arrange 方法添加到ActiveRecord ：：基础。它不会将此方法添加到数组中，因此您不应该指望它在数组上工作。

我假设您声明 @shipmgr_carriers 就像这样：

  class SomeController< ActionController :: Base 
 def some_action 
 @shimgr_carriers = SomeModel.find（...）。运营商
结束
结束
  

试试这个：

  def some_action 
 @shipmgr_carriers = SomeModel.find（...）。运营商
 
 @shipmgr_carriers_arranged = @ shipmgr_carriers.arrange（...）
结束
  

我的直觉是，当 @shipmgr_carriers 到达您的视图时，查询已经运行，将它转换为一个结果数组而不是一个关系。

这是逻辑，应该可以在控制器中完成，所以将它移出视图是一件好事无论什么想法。

I am using the Ancestry Gem and I am getting an undefined method "arrange" for #<Array:0x007f8d58e58700> error with the following code:

<%= @shipmgr_carriers.arrange(:order => :name) %>

However, When I just output @shipmgr_carriers I get an array with ancestry:

[#<Shipmgr::Carrier id: 9, name: "testing", status: nil, created_at: "2012-01-16 22:44:28", updated_at: "2012-01-16 22:44:28", ancestry: nil>, #<Shipmgr::Carrier id: 10, name: "test", status: nil, created_at: "2012-01-16 22:44:28", updated_at: "2012-01-16 22:44:28", ancestry: "9">] 

Can anyone tell me why I am unable to call the .arrange method on the array variable?

解决方案

I haven't used Ancestry but it looks like it adds the arrange method to ActiveRecord::Base. It doesn't add this method to Array and so you shouldn't expect it to work on an array.

I'm assuming you're declaring @shipmgr_carriers in your controller something like this:

class SomeController < ActionController::Base
  def some_action
    @shimgr_carriers = SomeModel.find(...).carriers
  end
end

Try this instead:

def some_action
  @shipmgr_carriers = SomeModel.find(...).carriers

  @shipmgr_carriers_arranged = @shipmgr_carriers.arrange(...)
end

My hunch is that by the time @shipmgr_carriers gets to your view the query has already been run, transforming it into an array of results instead of a relation.

This is logic that should probably be done in the controller anyway, so moving it out of the view is a good idea regardless.

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