ruby on rails - Validate paramaters in Restful endpoints -


i rookie in rails restful web service , trying build service returns json dump of deals.so far app returns these deals in json format when hit http://localhost:3000/api/deals. want add 2 mandatory parameters(deal_id , title) , 2 optional parameters in uri http://localhost:3000/api/deals?deal_id=2&title=book. best way validate these 2 mandatory parameters?in other words want query if deal_id , title parameters present. assuming deal model has fields deal_id, title, description , vendor.
here code

controller

  module api   class dealscontroller < applicationcontroller   respond_to :json    def index    @deals = deal.all    respond_with (@deals)   end  end end

routes

 namespace :api,:defaults => {format:'json'}  resources :deals end

to validate presence of query parameters in rails route, can use :constraints option. so, in case, if want require presence of parameters deal_id , title, can changing:

resources :deals

to:

resources :deals, :constraints => lambda{ |req| !req.params[:deal_id].blank? && !req.params[:title].blank? }

then, in controller, can access 4 parameters in params hash.

alternatively, if want provide more user friendly error messages, can validation in controller. there number of approaches. this:

def action   if params[:deal_id].blank? || params[:title].blank?     flash[:warning] = 'deal id , title must present'     redirect_to root_path , return   end    #rest of code goes here end

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