laravel orm

https://laravelacademy.org/post/9584.html

一对一：

class User extends Model
{ public function profile() { return $this->hasOne(Profile::class); } } class Profile extends Model { public function user() { return $this->belongsTo(User::class); } }

一对多：

 class Post extends Model { 
　　public function comments() {
　　 return $this->hasMany(Comment::class);
　　 } }

class Comment extends Model {
　　 public function post() {
　　　　 return $this->belongsTo(Post::class);
　　　　 } }

多对多：

class User extends Model
{ public function roles() { return $this->belongsToMany(Role::class); } } class Role extends Model { public function users() { return $this->belongsToMany(User::class); } }