gistfile1.rb

class Lead


  @@filter_options = ["followup","skype", "documents", "estimate"]

  @@all_options = ["followup","skype", "documents", "won", "lost", "estimate"]

  validates :status, :inclusion => { :in =>  @@all_options}

  validates_presence_of :status, :name_project, :name_client, :url_project

  def self.filter_options
    @@filter_options
  end

  def self.filter_all_options
    @@all_options
  end

  def self.filter_by_status(status)
    where(:status => status)
  end

  def self.sorted_by_status
    Lead.filter_options.each do |status|
      instance_variable_set("@" + status, Lead.where(:status => status))
    end
    all = Array.new
    Lead.filter_options.each do |status|
      local = instance_variable_get("@" + status)
      all += local.to_a
    end
  all
  end

  def self.all_sorted_by_status
    Lead.filter_all_options.each do |status|
      instance_variable_set("@" + status, Lead.where(:status => status))
    end
    all = Array.new
    Lead.filter_all_options.each do |status|
      local = instance_variable_get("@" + status)
      all += local.to_a
    end
  all
  end

end



VS 


class Lead


  @@all_options = ["followup","skype", "documents", "won", "lost", "estimate"]

  def self.sorted_by_status
    self.abstract_sorted(index_filter)
  end

  def self.all_sorted_by_status
    self.abstract_sorted(filter_all_opctions)
  end

  def self.abstract_sorted(collection)

    all = Array.new

    collection.each do |status|
      instance_variable_set("@" + status, Lead.where(:status => status))
    end

    collection.each do |status|
      local = instance_variable_get("@" + status)
      all += local.to_a
    end

    all
  end

end