Laravel关联模型中过滤结果为空的结果集(has和with区别)_php实例_

 $userCoupons = UserCoupons::with(['coupon' => function($query) use($groupId){ return $query->select('id', 'group_id', 'cover', 'group_number', 'group_cover')->where([ 'group_id' => $groupId, ]); }]) // 更多查询省略...

 array(20) { ["id"]=> int(6) ["user_id"]=> int(1) ["corp_id"]=> int(1) ["coupon_id"]=> int(4) ["obtain_time"]=> int(1539739569) ["receive_time"]=> int(1539739569) ["status"]=> int(1) ["expires_time"]=> int(1540603569) ["is_selling"]=> int(0) ["from_id"]=> int(0) ["sell_type"]=> int(0) ["sell_time"]=> int(0) ["sell_user_id"]=> int(0) ["is_compose"]=> int(0) ["group_cover"]=> string(0) "" ["is_delete"]=> int(0) ["score"]=> int(100) ["created_at"]=> NULL ["updated_at"]=> NULL ["coupon"]=> NULL // 注意返回了coupons为空的数据 }

 select `id`, `group_id`, `cover`, `group_number`, `group_cover` from `youquan_coupons` where `youquan_coupons`.`id` in (1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14) and (`group_id` = 1) and `youquan_coupons`.`deleted_at` is null

 $userCoupons = UserCoupons::whereHas('coupon', function($query) use($groupId){ return $query->select('id', 'group_id', 'cover', 'group_number', 'group_cover')->where([ 'group_id' => $groupId, ]); })->with(['coupon' => function($query) use($groupId){ return $query->select('id', 'group_id', 'cover', 'group_number', 'group_cover'); }])-> // ...

 select * from `youquan_user_coupons` where exists (select `id`, `group_id`, `cover`, `group_number`, `group_cover` from `youquan_coupons` where `youquan_user_coupons`.`coupon_id` = `youquan_coupons`.`id` and (`group_ids` = 1) and `youquan_coupons`.`deleted_at` is null) and (`status` = 1 and `user_id` = 1)