1. 各景點有多少人按讚：/tours?_embed=likes
2. 我的會員>按讚列表：/likes?userId=2&_expand=tour

{
  "users": [
    {
      "id": 1,
      "name": "John",
      "email": "[email protected]"
    },
    {
      "id": 2,
      "name": "Mary",
      "email": "[email protected]"
    }
  ],
  "tours": [
    {
      "city":"高雄",
      "name":"博二藝術特區",
      "id": 1
    },
    {
      "city":"高雄",
      "name":"高雄市立美術館",
      "id": 2
    }
  ],
  "likes": [
    {
      "tourId":1,
      "userId": 2,
      "id": 1
    },
    {
      "tourId":1,
      "userId": 1,
      "id": 2
    }
  ]
}