Module: ActiveRecord::Acts::Constant::ClassMethods

Defined in:
lib/acts_as_constant.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_constant(col = :name) ⇒ Object 



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# File 'lib/acts_as_constant.rb', line 10

def acts_as_constant(col = :name)
  begin
    #puts self.to_s
    
    # let's set up a variable to represent the name of the klass
    const = self.to_s
    
    # create a constant array to hold the values
    # create a nice get method to pull from the constant array
    class_eval %{
      private
      #{const.upcase}_CONSTANTS = []
      
      public
      def self.get(id)
        return nil if id.blank?
        #{const.upcase}_CONSTANTS[id]
      end
      
      def self.CONSTANTS
        #{const.upcase}_CONSTANTS
      end
    }                     
    
    # let's build methods for everything in the database.
    Module.const_get(const).find(:all).each do |rec|
      #puts rec.inspect
      name = rec.send(col)
      
      unless name.nil?
        
        # let's sanitize the name a bit.
        name = name.downcase
        name = name.gsub(' ', '_')                                                                        
        
        # let's create two methods an all downcase method for accessing the constant and an upper case one
        class_eval %{
          # by using .freeze we can prevent the object from being modified.
          #{const.upcase}_CONSTANTS[#{rec.id}] = rec.freeze
          
          def self.#{name}
            #{const.upcase}_CONSTANTS[#{rec.id}]
          end
          
          def self.#{name.upcase}
            #{const.upcase}_CONSTANTS[#{rec.id}]
          end
        }
      end
    end
    class_eval %{
      # by using .freeze we can prevent the constants array from being modified.
      #{const.upcase}_CONSTANTS.freeze
    }
  rescue => ex
  end
  
end