Replace `method_missing` with dynamic method definition.

replace_dynamic_receptor_with_dynamic_method_definition.rb

class Decorator
  def initialize(subject)
    @subject = subject
  end

  def method_missing(sym, *args, &block)
    @subject.send sym, *args, &block
  end
end

# Since the method call is being called on the decorator but the subject is raising the error,
# it may be painful to track down where the problem resides.
#
# These problems can be avoided entirely by using the available data to dynamically define methods at runtime.
#
# Using this technique any invalid method calls will be correctly reported as NoMethodErrors on the decorator.
# Additionally, there’s no method_missing definition, which should help avoid the stack level too deep problem entirely.

# Move subject's methods to Decorator instance's singleton methods.
class Decorator
  def initialize(subject)
    subject.public_methods(false).each do |meth|
      (class << self; self; end).class_eval do
        define_method meth do |*args|
          subject.send meth, *args
        end
      end
    end
  end
end