在Ruby on Rails 2.3.x中發送參數到GET請求

Question

我是新來的rails，我目前使用2.3.8。我正在爲iOS應用程序設計一個Web服務。

因爲我通常是客戶端iPhone開發人員，所以我對服務器端實現的知識非常少。

我遇到的問題是，我試圖將GET請求中的某些參數傳遞給我的控制器之一中的索引操作。這是使用默認路由

map.resources :dishes 

其中碟子是控制器的名稱，使用腳手架創建。

我想通過多個參數到一個新的動作或索引，這將允許我篩選菜餚對象返回。

索引方法看起來像

def index 
    if(params[:latitude]) 
    @min = 0.5 - 1 
     @max = 0.5 + 1 
     @locations = Location.find(:all, :conditions => [":latitude > ? AND :latitude < ?", @min, @max]) 
     @dishes = new Array 
     @locations.each do |loc| 

      @dishes = @dishes + loc.dishes 

     end 

     respond_to do |format| 
      format.html # index.html.erb 
      format.json {render :json => @dishes.to_json(:except => [ :user_id, :location_id , :like_id], :include => { :user => { :only => [:id, :name] } } ) } 

     end 
    else 
     @dishes = Dish.all 

     respond_to do |format| 
     format.html # index.html.erb 
     format.json {render :json => @dishes.to_json(:except => [ :user_id, :location_id , :like_id], :include => { :user => { :only => [:id, :name] } } ) } 

     end 
    end 
end 

我目前收到以下錯誤，當我通過一個額外的PARAM

ArgumentError in DishesController#index 
wrong number of arguments (1 for 0) 

完整的錯誤：

ArgumentError in DishesController#index 
wrong number of arguments (1 for 0) 
RAILS_ROOT: /Users/jon/Documents/Dev/Research/FF5_Rails_Test/FF5 

Application Trace | Framework Trace | Full Trace 
/Users/jon/Documents/Dev/Research/FF5_Rails_Test/FF5/app/controllers/dishes_controller.rb:9:in `new' 
/Users/jon/Documents/Dev/Research/FF5_Rails_Test/FF5/app/controllers/dishes_controller.rb:9:in `index' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:1331:in `send' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:1331:in `perform_action_without_filters' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/filters.rb:617:in `call_filters' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue' 
/Library/Ruby/Gems/1.8/gems/activesupport- 2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/rescue.rb:160:in `perform_action_without_flash' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/flash.rb:151:in `perform_action' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:532:in `send' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:532:in `process_without_filters' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/filters.rb:606:in `process' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:391:in `process' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/base.rb:386:in `call' 
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.8/lib/action_controller/routing/route_set.rb:438:in `call' 
Request 

Parameters: 

{"format"=>"json", 
"latitude"=>"0.5"} 
Show session dump 

Response 

Headers: 

{"Content-Type"=>"", 
"Cache-Control"=>"no-cache"} 

我知道這與Rails的RESTful設計略有不同，但我無法找到另一種方式來實現它。

再一次，我是一個新的rails/web服務開發，所以如果你有任何提示，我會歡迎他們。

謝謝。

Answer 1

你有

@dishes = new Array 

這不是紅寶石不幸:)有三種方法來創建Array

@dishes = Array.new 
@dishes = [] 
@dishes = Array(nil) 

也講究一個實例來

/Users/jon/Documents/Dev/Research/FF5_Rails_Test/FF5/app/controllers/dishes_controller.rb:9:in 'new' 
/Users/jon/Documents/Dev/Research/FF5_Rails_Test/FF5/app/controllers/dishes_controller.rb:9:in 'index' 

告訴你那個錯誤發生在new而不是在index