Eloquent makes managing and working with these relationships easy, and supports several different types of relationships:- [One To One](#one-to-one) - [One To Many](#one-to-many) - [Many To Many](#many-to-many) - [Has Many Through](#has-many-through) - [One To One (Polymorphic)...
Of course, your database tables are probably related to one another. For example, a blog post may have many comments, or an order could be related to the user who placed it. Eloquent makes managing and working with these relationships easy. Laravel supports many types of relationships:...
除了One To One、One To Many、Many To Many 以外,laravel还提供了 Has Many Through(远层一对多关联:跨一个表进行一对多关联)、Polymorphic Relations(多态关联:某个字段多态关联不同的外表)、Many To Many Polymorphic Relations(多态的多对多关联) Eager Loading:关联查询的时候提高效率的机制,使用 with() 方法...
$user->contact()->detach([1, 2]); 关系表中额外的属性通过withPivot()方法来定义,例如: $this->belongsToMany(User::class)->withPivot('status'); 在获取status字段时,由于是集合关系,所以类似于: $user->contacts->each(function ($contact){ echo $contact->pivot->status; }); 想要更新关联表中...
return$this->hasOne('App\Phone','user_id','id'); } } // 所属 classPhoneextendsModel { /** * 获取拥有该手机的用户 */ publicfunctionuser() { // User : 所属的模型 // Phone : user_id 外键 // User : id 父模型主键 return$this->belongsTo('App\User','user_id','id'); ...
* Get the phone record associated with the user. */publicfunctionphone(){return$this->hasOne('App\Phone');}} 传递到hasOne方法的第一个参数应该是关联模型的名称。一旦关联被定义完成,我们可以使用 Eloquent 的动态属性来访问关联模型的记录。动态属性允许你访问关联函数,就像是它们是定义在模型中的属性一...
return $this->hasOne(Profile::class, 'user_id', 'id'); } 1. 2. 3. 4. 5. 6. 7. 8. 然后,即可在控制类中使用: //注意:->profile 不要加括号,以属性方式访问 $profiles = User::find(19)->profile; return $profiles; 1. 2. ...
通过 pivot 属性 $user = App\User::find(1); foreach ($user->roles as $role) { echo $role->pivot->created_at; } // 当 pivot 表包含额外的属性时, 必须定义关联时先指定 return $this->belongsToMany('App\Role')->withPivot('column1', 'column2'); // 自动包含created_at 和 updated_...
Trees: One Parent per Node (One-to-Many) Graphs: Multiple Parents per Node (Many-to-Many)Trees: One Parent per Node (One-to-Many)Use the package to traverse a tree structure with one parent per node. Use cases might be recursive categories, a page hierarchy or nested comments....
One-To-Manyclass User extends NeoEloquent { public function posts() { return $this->hasMany('Post', 'POSTED'); } }This represents an OUTGOING relationship direction from the :User node to the :Post node.$user = User::find(1); $post = new Post(['title' => 'The Title', 'body'...