查询一个教室：

$ curl http://localhost:8080/api/katharsis/classrooms/4 | jq .
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   834    0   834    0     0  62462      0 --:--:-- --:--:-- --:--:--  116k
{
  "data": {
    "id": "4",
    "type": "classrooms",
    "attributes": {
      "name": "Classroom No.1"
    },
    "relationships": {
      "students": {
        "data": [
          {
            "id": "3",
            "type": "students"
          },
          {
            "id": "2",
            "type": "students"
          },
          {
            "id": "1",
            "type": "students"
          }
        ],
        "links": {
          "self": "https://www.pkslow.com/api/katharsis/classrooms/4/relationships/students",
          "related": "https://www.pkslow.com/api/katharsis/classrooms/4/students"
        }
      }
    },
    "links": {
      "self": "https://www.pkslow.com/api/katharsis/classrooms/4"
    }
  },
  "included": [
    {
      "id": "1",
      "type": "students",
      "attributes": {
        "name": "Larry Deng"
      },
      "links": {
        "self": "https://www.pkslow.com/api/katharsis/students/1"
      }
    },
    {
      "id": "2",
      "type": "students",
      "attributes": {
        "name": "Eason"
      },
      "links": {
        "self": "https://www.pkslow.com/api/katharsis/students/2"
      }
    },
    {
      "id": "3",
      "type": "students",
      "attributes": {
        "name": "JJ Lin"
      },
      "links": {
        "self": "https://www.pkslow.com/api/katharsis/students/3"
      }
    }
  ]
}

新增一个学生：

$ curl --header "Content-Type: application/json"   --request POST   --data '{
    "data": {
        "type": "students",
        "attributes": {
            "name": "Justin"
        }
    }
}'   http://localhost:8080/api/katharsis/students | jq .

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   249    0   135  100   114  11202   9459 --:--:-- --:--:-- --:--:-- 41500
{
  "data": {
    "id": "6",
    "type": "students",
    "attributes": {
      "name": "Justin"
    },
    "links": {
      "self": "https://www.pkslow.com/api/katharsis/students/6"
    }
  }
}

修改：