如何從選擇框中訪問ID？

Question

我有一個表格，其中有一個從數據庫中選擇了城市名稱的框。當我選擇一個城市並點擊繼續時，我希望它抓取所選的city_id，並將我重定向到另一頁(:controller=> 'people', action => 'index')，我將在那裏使用該city_id。我該怎麼做呢？蔭使用Rails 3，本就是我..

查看

<%= form_for :cities, :url=>{:action =>"next"} do |f| %> 
<%= collection_select(nil, :city_id, City.all, :id, :name ,:prompt=>"Select your city") %> 
<%=f.submit "continue" %> 
<%end%> 

控制器

class HomeController < ApplicationController 
    def next 
    @city = City.find(params[:city_id]) 
    redirect_to :controller => "people", :action => "index" 
    end 
    def new 
    @city = City.new 
    end 
end 

人民控制器

class PeopleController < ApplicationController 
    def index 
    @city = City.find(params[:city_id]) 
    end 
end 

Answer 1

您可以通過在你的next動作設置會話變量做到這一點：

class HomeController < ApplicationController 
    def next 
    @city = City.find(params[:city_id]) 
    session[:city_id] = @city.id 
    redirect_to :controller => "people", :action => "index" 
    end 
    def new 
    @city = City.new 
    end 
end 

class PeopleController < ApplicationController 
    def index 
    unless session[:city_id].nil? || session[:city_id].blank? 
     @city = City.find(session[:city_id]) 
     # do your stuff here 
    end 
    end 
end 

您也可以用閃光燈變量做到這一點，但會議有可能在適當的位置。