source_location.rb

# config/initializers/method_source_locator.rb

# Utility to find the source location of a method based on its receiver and name
def source_location(receiver, method_name)
  method_object = if receiver.singleton_class.method_defined?(method_name) || receiver.singleton_class.private_method_defined?(method_name)
                    # Class method
                    receiver.method(method_name)
                  elsif receiver.method_defined?(method_name) || receiver.private_method_defined?(method_name)
                    # Instance method
                    receiver.instance_method(method_name)
                  else
                    raise NoMethodError, "Undefined method `#{method_name}` for #{receiver}"
                  end

  method_object.source_location
rescue NameError => e
  raise NameError, "Error finding method: #{e.message}"
end

# For a class method
source_location(User, :hello)

# For an instance method
source_location(User.new, :instance_method_name)