Ruby on rails 使用关系的条件问题

我试图使用关系中的三个表从另一个表中搜索一列

在我看来，

policy\u vehicles

我有一个

text\u field\u标签

，希望通过“raz\u soc”进行搜索

我的桌子是：

Policy_vehicles
   |id|       |policy_id| 
    integer      integer
     100            1 
     200            2

Policies
   |id|    |client_id|
   integer  integer
    1        1
    2        2     

Clients
   |id|     |raz_soc|
    integer  varchar(255)
    1       MARATEX SAC
    2       ATT

这是我的控制器：

class PolicyManagement::PolicyController < ApplicationController

  def generate_print_per_vehicle
      params[:search_policy_id] =   Policy.find(:all,:joins => :client ,:conditions => ['raz_soc LIKE ?',"%#{params[:search_raz_soc]}%"  ])
      @policies= PolicyVehicle.find(:all,:joins => :policy, :conditions => ['policy_id = ?',params[:search_policy_id] ]) 
  end

end

应该是这样的搜索：

 Policy Load (3.1ms)   SELECT `policies`.* FROM `policies` INNER JOIN `clients` ON `clients`.id = `policies`.client_id WHERE (raz_soc = 'MARATEX SAC') 
 PolicyVehicle Load (0.3ms)   SELECT `policy_vehicles`.* FROM `policy_vehicles` INNER JOIN `policies` ON `policies`.id = `policy_vehicles`.policy_id WHERE (policy_id = 1) 

我尝试过这个，但不起作用：

 #controller
 @policy =         Policy.find(:all,:joins => :client ,:conditions => ['raz_soc LIKE ?',params[:search_raz_soc]  ])
 @policies= PolicyVehicle.find(:all,:joins => :policy, :conditions => ['policy_id = ?',@policy    ])

#logs
 Policy Load (3.1ms)   SELECT `policies`.* FROM `policies` INNER JOIN `clients` ON `clients`.id = `policies`.client_id WHERE (raz_soc = 'MARATEX SAC') 
 PolicyVehicle Load (0.3ms)   SELECT `policy_vehicles`.* FROM `policy_vehicles` INNER JOIN `policies` ON `policies`.id = `policy_vehicles`.policy_id WHERE (policy_id = 70353610714140) 

我正试着做这样的事情

 select * from policy_vehicles where policy_id
    IN ( SELECT id FROM policies WHERE
    client_id IN (SELECT id FROM clients raz_soc = ?) )

有人能帮我吗

试试这个（我已经解释了查询返回的内容，所以请确保这是您想要从中得到的）

其他选项是在单个查询中执行，如下所示：

@policy_vehicles = PolicyVehicle.joins(:policy => :client).
                   where('clients.raz_soc LIKE ?',"%#{params[:search_raz_soc]}%")

 #controller
 @policy =         Policy.find(:all,:joins => :client ,:conditions => ['raz_soc LIKE ?',params[:search_raz_soc]  ])
 @policies= PolicyVehicle.find(:all,:joins => :policy, :conditions => ['policy_id = ?',@policy    ])

#logs
 Policy Load (3.1ms)   SELECT `policies`.* FROM `policies` INNER JOIN `clients` ON `clients`.id = `policies`.client_id WHERE (raz_soc = 'MARATEX SAC') 
 PolicyVehicle Load (0.3ms)   SELECT `policy_vehicles`.* FROM `policy_vehicles` INNER JOIN `policies` ON `policies`.id = `policy_vehicles`.policy_id WHERE (policy_id = 70353610714140) 

 select * from policy_vehicles where policy_id
    IN ( SELECT id FROM policies WHERE
    client_id IN (SELECT id FROM clients raz_soc = ?) )

@policies =  Policy.find(:all,:joins => :client ,
             :conditions => ['raz_soc LIKE ?',"%#{params[:search_raz_soc]}%"] ) 
# returns an array of policy records based on the raz_soc condition on client 

@policy_vehicles = PolicyVehicle.find(:all,:joins => :policy,
                   :conditions => ['policy_id IN (?)',@policies] )
# returns an array of policy_vehicles that are associated with any record in the @policies array

@policy_vehicles = PolicyVehicle.joins(:policy => :client).
                   where('clients.raz_soc LIKE ?',"%#{params[:search_raz_soc]}%")