Question

我正在尝试使用搜索参数中的选择结果

   SELECT distinct policy_business_unit_id as number FROM `policies` WHERE (policy_business_unit_id ='2')

该条件显示

   number
     2

我试图在我的参数条件下使用“2”。

   SELECT distinct policy_business_unit_id as number FROM `policies` WHERE (policy_business_unit_id ='2')
   SELECT * FROM `cia_ensures` WHERE (id = 2)

但我得到了这个

 SELECT * FROM `cia_ensures` WHERE (id = NULL)

我的桌子：

|cia_ensures|
   |id|  |name|
    1      aaa
    2      bbb
    3      ccc
    ...

|policy_business_units|
   |id|  |name|
    1      abc
    2      def
    3      ghi
    ...

|policies|
   |id|   |number| |policy_business_unit_id|
    1       1234              2
    2       5678              1
    3       9123              2
    4       4567              1      
    ...

这是控制器：

   def ajax
     @business = PolicyBusinessUnit.find(:all)
     @select = Policy.find(:all,:select=>['distinct policy_business_unit_id as number'],:conditions=>['policy_business_unit_id = ?',params[:business] ])    
     @list_cias = CiaEnsure.find(:all,:conditions=>['id = ?',@select])
   end

以下是模型：

   class Policy < ActiveRecord::Base
      belongs_to :cia_ensure
   end

   class CiaEnsure < ActiveRecord::Base
      has_many :policies
   end

以下是观点：

   Business: 
   <%= select_tag "business",options_for_select(@list_cias.collect {|t| [t.name.to_s ,t.id]}, params[:business].to_i ) %>

   Cias:
   <%= select_tag "cias",options_for_select(@business.collect {|t| [t.name.to_s ,t.id]}, params[:cias].to_i ) %>

我要做的是：

     @business = PolicyBusinessUnit.find(:all)
     @select = Policy.find(:all,:select=>['distinct policy_business_unit_id as number'],:conditions=>['policy_business_unit_id = ?',params[:business] ])    
     @list_cias = CiaEnsure.find(:all,:conditions=>['id = ?',@select[0].try(:number)  ])

这是我的日志：

   ##### HERE I SHOULD HAVE THE NUMBER 2
   SELECT distinct policy_business_unit_id FROM `policies` WHERE (policy_business_unit_id ='2')

   ##### I WANT TO USE NUMBER 2 
   SELECT * FROM `cia_ensures` WHERE (id = NULL)

请有人帮助我吗？

Answer 1

当你提供

@list_cias = CiaEnsure.find(:all,:conditions=>['id = ?',@select[0].try(:number)  ])

您确定@select[0]包含响应:number的对象吗？

您可以向我们提供@select变量吗？

PS：如果您使用的是比rails 2.3更新的任何内容，请重新阅读AR查询

我怎样才能使用像param一样的选择？

1 个答案: