Module: AttributesSort

Defined in:
lib/attributes_sort.rb

Class Method Summary collapse

Class Method Details

.included(receiver) ⇒ Object 



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# File 'lib/attributes_sort.rb', line 2

def self.included(receiver)
  receiver.instance_eval do
    def build_attributes(attributes)
      "[" << attributes.map!{|attribute| "object.#{attribute}"}.join(",") << "]"
    end

    def do_attributes_sort(collection, attributes)
		attribute_array_string = build_attributes(attributes)
      collection.sort_by{|object| eval(attribute_array_string)}
    end
  end
  Array.class_eval do
	def sortable_attributes?
		self.all? {|object| @attributes.all?{|attribute| object.respond_to?(attribute)}}
	end

    def class_type
      klass = self.first.class

      #use duck type check respond to check instead				
      #is_same = self.all?{|object| object.class == klass}
		#raise "All objects must be of the same class type" unless is_same

		raise "All objects must respond to sort criteria"unless sortable_attributes?	
      klass
    end

    def attr_sort(options = {})
		@attributes = options[:sort_by]
      raise "You must pass in sort_by criteria" unless @attributes 
      class_type.do_attributes_sort(self, @attributes)
    end
  end
end