Module: JazzModel::KeyContext

Included in:
Chord, Mode, NotesCollection, Scale
Defined in:
lib/jazz_model/key_context.rb

Overview

Key context is a module intended to be mixed in to classes requiring the notion of “key context”. Concepts such as chords and scales exist as mathematical relationships absent key, but can be put into key context. Adds a key instance variable to the including class and two new methods:

  • in_key_of(new_key) - Sets the key context to the specified new_key.

  • without_key - Removes key context.

Class Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/jazz_model/key_context.rb', line 11

def self.included(klass)
  klass.class_eval do
    attr_accessor :key

    def in_key_of(name)
      self.key = Key.find_by_name(name)
      self
    end
    alias_method :in, :in_key_of

    def without_key
      self.key = nil
      self
    end
  end
end