Use Memoizer instead of ActiveSupport::Memoizable

ActiveSupport::Memoizable will be removed from Rails and has a lot of strange caveats that will ruin your day.

Use the Memoizer gem Show archive.org snapshot instead. It works in all past and future Railses and has none of the annoying "features" of ActiveSupport::Memoizable. It just does memoization and does it well.

The syntax is similiar also:

Copyclass Foo
  include Memoizer
  
  def bar
      ...
  end
  
  memoize :bar
  
end

If you're using Ruby 2.1+, you can write this even shorter:

Copyclass Foo
  include Memoizer
  
  memoize def bar
      ...
  end

end

This is because def returns the method name as a symbol Show archive.org snapshot in 2.1+.