如何使用具有关系的两个表创建选择框?

我正在尝试创建一个选择框,显示我的 ejecutive_name 和 last_name 从我的“策略”视图中的表Ejecutives中,但我需要创建一个搜索按钮来从我选择的Ejecutive中获取参数

我的模特有一种关系:

class Policy < ActiveRecord::Base
  unloadable
  belongs_to :ejecutive
  has_many :policy 
end

class Ejecutive < ActiveRecord::Base
  has_many :policies
end

我的桌子之间的关系 ejecutive_id :

class CreateEjecutives < ActiveRecord::Migration
  def self.up
   create_table :ejecutives do |t|
     t.string :name,:null=>false
     t.string :lastname1,:null=>false
     t.timestamps
   end
  end

  def self.down
    drop_table :ejecutives
  end
end

class CreatePolicies < ActiveRecord::Migration
 def self.up
   create_table :policies do |t|
     t.string :num_policy, :null=>false
     t.integer :ejecutive_id
     t.timestamps
   end
 end

 def self.down
  drop_table :policies
 end
end

这是我的控制器:

class PolicyManagement::PolicyController < ApplicationController
   @ejecutives = Ejecutive.find(:all)
   @policies = Policy.find(:all)
end  

这是我的观点:

 Select Ejecutive:
 %= select_tag 'ejecutives',"<option value=\"\">Seleccione</option>"+options_for_select(@ejecutives.collect {|t| [t.name.to_s+" "+t.lastname1.to_s,t.id]})%>


 Results
  <% @policies.each do |policy| %>
  <p> <%= policy.num_policy%> </p>
  <p> <%= policy.ejecutive.name %> </p>
  <p> <%= policy.ejecutive.last_name %> </p>
  <% end %>

我试过了

<% form_tag :controller=>"policy_management/policy",:action =>"generate_print_ejecutive_comercial", :method => 'get' do %>
  <p>
  <%= text_field_tag :search,params[:search] %>
  <%= select_tag "Ejecutives", options_from_collection_for_select(@ejecutives, "id", "name") %>
   #Here i in select_tag "ejecutives" need to add searh params..
  <%= submit_tag "Search", :name => nil %>
  </p>
<% end %>

我使用的是Rails 2.3.5。

有人知道这个问题吗?我真的很感激你的帮助。