method missing for finders

finders.rb

# This...

def by_id(id)
  filter_by(:id, id)
end

def by_email(email)
  filter_by(:email, email)
end

# vs...

def method_missing(method, *args)
  match = /by_(?<filter>\w+)/.match(method)

  if match
    filter_by match[:filter], args
  else
    super
  end
end