path是相对路径 url是绝对路径 model为复数的会对应到action=>index, 为单数时需要传递id参数并对应到action=>show
如对于user而言： users_url # => http://localhost:3000/users users_path # => /users user_path(1) # => /users/1 user_url(1) # => http://localhost:3000/users/1