Rails compatible method logging. Use this to log all calls to instance methods of a class to the log.

gistfile1.rb

Model.new.foo

method_logger.rb

module MethodLogger
  def self.included(base)
    methods = base.instance_methods(false) + base.private_instance_methods(false)
    base.class_eval do
      methods.each do |method_name|
        original_method = instance_method(method_name)
        define_method(method_name) do |*args, &block|
          Rails.logger.info "-> #{base}##{method_name}(#{args.inspect})"
          return_value = original_method.bind(self).call(*args, &block)
          Rails.logger.info "<- #{base}##{method_name} #=> #{return_value.inspect}"
          return_value
        end
      end
    end
  end
end

model.rb

class Model
  include MethodLogging

  def foo
    "bar"
  end
end

rails.log

-> foo([])
<- foo #=> "bar"

Very handy. Thanks for sharing. include MethodLogging needs to be include MethodLogger though.

Doesn't self.included only know about the methods above it? Wouldn't it have to be included at the bottom of model.rb for it to see foo?

Could also checkout https://github.com/ridiculous/object_tracker for tracking all methods with execution time