grants.rb

class Migration
  @grants = {}
  
  def self.grant(name, &blk)
    if block_given?
      proxy = ConfigProxy.new(&blk)
      grant = Grant.new(proxy.options)
      @grants[name] = grant
    else
      @grants[name]
    end
  end
  
  class Grant
    def initialize(opts)
      
    end
    
    def up
      
    end
    
    def down
      
    end
  end
  
  class ConfigProxy
    attr_reader :options
    
    def initialize(&blk)
      instance_eval(&blk)
    end
    
    def method_missing(method, *opt)
      @options ||= {}
      @options[method] = opt
    end
  end
end