Blog comment - Ruby method visibility

ruby_method_visibility.rb

class Sample
  attr_accessor :protected_attribute, :private_attribute
  protected :protected_attribute=
  private :private_attribute=

  def initialize
    self.protected_attribute = 'some protected value'
    self.private_attribute = 'some private value'
  end
end

sample = Sample.new

sample.protected_attribute
#=> some protected value

sample.private_attribute
#=> some private value

sample.protected_attribute = 'foo'
#=> NoMethodError: protected method `protected_attribute=' called for #<Sample:0x007fd2bb090c78>

sample.private_attribute = 'bar'
#=> NoMethodError: private method `private_attribute=' called for #<Sample:0x007fd2bb090c78>