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); } }