Chord definitions DSL

gistfile1.rb

module ChordDSL
  def chord(file_path, &block)
    chord = Chord.new
    chord.file_path = file_path
    chord_ctx = ChordContext.new chord
    chord_ctx.instance_exec &block
    chord.save!
  end

  class ChordContext
    def initialize(chord)
      @chord = chord
    end

    def one(tuning="E", fret_action="x")
      @chord.one_tuning = tuning
      @chord.fret = fret_action
    end

    def two(tuning="A", fret_action="x")
      @chord.two_tuning = tuning
      @chord.fret = fret_action
    end

    # more methods for strings 3-6
  end
end

class Chord < ActiveRecord::Base
  def before_save
    # generate your image and tie to this chord.
  end
end

class ChordMigration < ActiveRecord::Migration
  extend ChordDSL

  chord 'a_minor' do
    one   :x
    two    0
    three  2
    four   2
    five   1
    six    0
  end

  # other chord definitions...
end