Post once exactly in Rails

post_once_exactly.rb

# Put in controller action 
def create
  post_once_exactly(params[:uuid]) do
    # do some stuff
  end
end

# Put in API base controller
def post_once_exactly uuid
  if(uuid.nil? || !$redis.sadd("post_requests", uuid))
    render "api/errors/duplicate_request", status: 405
  else
    yield
  end
end