php – Accessors(Getter)和Mutators(Setter)在Laravel的数据透

class User extends Model {
    public function workspaces() {
        return $this->belongsToMany('AppModelsWorkspace')->withPivot('role');
    }
}

class Workspace extends Model {
    public function users() {
        return $this->belongsToMany('AppModelsUser')->withPivot('role');
    }
}

现在您的角色字段将在数据透视表中可用：

$user = User::first();

// get data
foreach($user->workspaces as $workspace) {
    var_dump($workspace->pivot->role);
}

// set data
$workspaceId = $user->workspaces->first()->id;
$user->workspaces()->updateExistingPivot($workspaceId,['role' => 'new role value']);

如果您确实需要为数据透视表创建访问器/更改器,则需要创建自定义数据透视表类.我以前没有这样做,所以我不知道这是否真的有效,但看起来你会这样做：

创建一个包含访问者/ mutator的新pivot类.此类应扩展默认的Pivot类.这个新类是当User或Workspace创建Pivot模型实例时将要实例化的类.

namespace AppModels;
use IlluminateDatabaseEloquentRelationsPivot;
class UserWorkspacePivot extends Pivot {
    getRoleAttribute() {
        ...
    }
    setRoleAttribute() {
        ...
    }
}

现在,更新User和Workspace模型以创建此新的数据透视表类,而不是默认的类.这是通过重写Model类提供的newPivot()方法完成的.您希望覆盖此方法,以便创建新UserWorkspacePivot类的实例,而不是默认的Pivot类.

class User extends Model {
    // normal many-to-many relationship to workspaces
    public function workspaces() {
        // don't forget to add in additional fields using withPivot()
        return $this->belongsToMany('AppModelsWorkspace')->withPivot('role');
    }

    // method override to instantiate custom pivot class
    public function newPivot(Model $parent,array $attributes,$table,$exists) {
        return new UserWorkspacePivot($parent,$attributes,$exists);
    }
}

class Workspace extends Model {
    // normal many-to-many relationship to users
    public function users() {
        // don't forget to add in additional fields using withPivot()
        return $this->belongsToMany('AppModelsUser')->withPivot('role');
    }

    // method override to instantiate custom pivot class
    public function newPivot(Model $parent,$exists);
    }
}