php - Laravel Eloquent 关系不起作用

Question

我已经定义了用户与投资组合的关系，但它给了我空，我的用户模型是

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword;
    protected $table = 'users';
    protected $fillable = ['name', 'email', 'password'];
    protected $hidden = ['password', 'remember_token'];

    public function portfolio()
    {
        $this->hasMany('App\Portfolio');
    }

}

我的投资组合模型是

class Portfolio extends Model
{

    protected $fillable = ['user_id', 'ptitle', 'pdate','pedate','purl','languages','pdes','attachments'];

    public function user()
    {
        $this->belongsTo('App\User');
    }
    public function attachments()
    {
        $this->hasMany('App\Attachment');
    }
}

并且我已经在迁移上定义了外键，我的迁移代码是

public function up()
    {
        Schema::create('portfolios', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id')->unsigned();
            $table->string('ptitle');
            $table->timestamps();
            $table->foreign('user_id')
                   ->references('id')
                    ->on('users')
                    ->onDelete('cascade');
        });
    }

我再次运行迁移。当我尝试获取用户组合时，它给了我空值，我在 Controller 的顶部声明了这个 use App\User; 然后我通过这个命令找到用户 $user=User::find(1) 最后我做了这个 $user->portfolio() 但它给了我 null 我陷入了 2 到 3 小时请帮助我

Answer 1

您应该返回关系以获取关系数据

public function portfolio()
{
   return $this->hasMany('App\Portfolio');
}