Creating dynamic queries depending on parameter passed in rails 3

Question

Is it possible to create something cleaner out of this dynamic query:

@photos = Photo.within(100, :origin => [params[:latitude], params[:longitude]]) unl         


        

Answer 1

I think the right way to do it is use scopes

scope :older_than, lambda { |value| where('id > (?)', value) if value }
scope :with_id, lambda { |value| where('id = (?)', value) if value }
scope :for_user, lambda { |value| where('user_id = (?)', value) if value }

later in search

@photos = Photo.within(100, :origin => [params[:latitude], params[:longitude]]) 
          unless (params[:latitude].nil? || params[:longitude].nil?)

@photos = Photo.with_id( params[ :id ] )
               .older_than( params[ :since_id ] )
               .for_user( params[ :user_id ] )
               .order("created_at DESC")
               .limit(15)