data_types_details.rb

class DataTypes
  def initialize
    @columns = {}
  end

  def columns
    @columns
  end

  def col(name, args)
    @columns[name] = args
  end
end

class Test
   def initialize
     @queries = {}
   end

   def queries
     @queries
   end

   def column_defs(query_name, &block)
     data_types = DataTypes.new
     yield data_types
     queries[query_name] = data_types.columns
     puts queries
   end
end

test = Test.new

test.column_defs :test_query do |q|
  q.col :satu    ,type: :string, length: 10
  q.col :dua     ,type: :integer, length: 5
  q.col :tiga    ,type: :boolean, default: true
end