请教 Laravel eloquent model 一对多关联关系，提示 belongsto 方法不存在的原因？

数据库中有两个表，分别为一对多关系：主表(预约信息)：dbo.Reservation [ReservationID] [INT] IDENTITY(1,1) NOT NULL, [ReservationNo] [NVARCHAR](24) NOT NULL, ......明细表（预约明细）：dbo.ReservationDetail [ReservationDetailID] [INT] IDENTITY(1,1) NOT NULL, [ReservationID] [INT] NOT NULL, --外键 ......Model的代码如下：Reservation.php<?phpnamespace App\\Models;use Illuminate\\Database\\Eloquent\\Model;class Reservation extends Model{ protected $table = 'dbo.Reservation'; public function hasManyReservationDetails() { return $this->hasMany('App\\Models\\ReservationDetail', 'ReservationID', 'ReservationID'); }ReservationDetail.php<?phpnamespace App\\Models;use Illuminate\\Database\\Eloquent\\Model;class ReservationDetail extends Model{ protected $table = 'dbo.ReservationDetail'; public function belongsToReservation() { return $this->belongsTo('App\\Models\\Reservation', 'ReservationID', 'ReservationDetailID'); }在一个API的controller里面调用<?phpnamespace App\\Api\\Controllers;use App\\Models\\Reservation;use App\\Models\\ReservationDetail;use App\\Http\\Requests;class ReservationController extends BaseController{ public function showByReservationNo($reservation\_no) { $reservation\_details = ReservationDetail::all() ->belongsToReservation() ->where('ReservationNo', '=', $reservation\_no) ->get(); return $reservation\_details; }Laravel返回的错误信息如下： "message": "Method belongsToReservation does not exist.", "status\_code": 500,请问这是什么原因，是不是namespace的问题？我希望实现的是用主表的某个条件关联去查询明细表，返回明细表的数据，查询的SQL语句如下：SELECT ReservationDetail.\*FROM ReservationDetailINNER JOIN Reservation ON Reservation.ReservationID = ReservationDetail.ReservationIDWHERE Reservation.ReservationNo = 'xxx'请问各位大牛，问题出在什么地方？准确的语法应该怎么写？另一个问题是，如果希望返回的数据是将主表和明细表合并成一个对象返回，例如：{ "ReservationID": "1", "ReservationNo": "201601011000", "ReservationDetails": [ { "ReservationDetailID": "1", "ReservationID": "1", }, { "ReservationDetailID": "2", "ReservationID": "1", } ]}关联查询应该怎么写？请各位大牛赐教，感激涕零！！！