Override 'find' of ActiveRecord::Base

June 17th, 2007

Recently, I was working on one ruby on rails project. where base site has many sub sites based on regions. we required to restrict many queries based on current-region/specific-region. the best solution I figured is add functionality to find method instead of using SQL JOINS. 
  def self.find(*args)
    if args.first == :first || args.first == :all
      if args.last.is_a?(Hash) && (region = args.last[:for_region]) && region.is_a?(Region)
        with_scope(:find => {:include => [:regionals], 
                                        :conditions =>  "regionals.region_id = #{region.id}"}) do
          args.last.delete(:for_region)
          super(*args)
        end
      else
        super
      end
    else
      super
    end
  end
I wrote above code in Business model. now I'm able to 
Business.find(:first, :for_region => current_region)
Business.find(:all, :for_region => current_region)
Business.find(:all, :for_region => Region.find(params[:region_id]), Any other valid find option ...)
isn't it cool?
Posted by niket Filed in Programming, Ruby on Rails

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