Module: HeadMusic::ValueEquality

Included in:
Instruments::AlternateTuning, Instruments::InstrumentConfiguration, Instruments::Stringing, Instruments::StringingCourse, Instruments::Variant, Notation::InstrumentNotation, Rudiment::UnpitchedNote
Defined in:
lib/head_music/value_equality.rb

Overview

ValueEquality gives a value object structural equality based on a declared list of attributes. Two instances are equal when they are the same class and every declared attribute is equal.

class Stringing include HeadMusic::ValueEquality value_equality :instrument_key, :courses end

Attributes are read with +send+, so protected or private readers work too.

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/head_music/value_equality.rb', line 28

def self.included(base)
  base.extend(ClassMethods)
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/head_music/value_equality.rb', line 32

def ==(other)
  return false unless other.is_a?(self.class)

  self.class.value_equality_attributes.all? { |attribute| send(attribute) == other.send(attribute) }
end