嵌套记录插入 knex.js

Question

我们有如下数据库模式：

students table

|编号 |姓名 |地址 |

一名学生有多种教育背景。

education_histories table

|编号 |学位 |大学 | student_id | #student_id是外键指向学生table

我们从客户端得到 JSON 结构如下：

{
    "name" :"Ram Neupane",
    "address": "Kathmandu, Bagmati",
    "education_histories": [
        {   
            "degree": "I.Sc.",
            "university": "Tribhuvan University"
        }, {
            "degree": "BE",
            "university": "Tribhuvan University"
        }
    ]
}

我不熟悉 Node.js and Knex.js. I want to insert student and nested education history on database using bluebird 与 Knex 的承诺。我该如何解决这个问题。

我已经尝试过以下承诺：

function create (jsonParam) {
    return new Promise(function (resolve, reject) {
      knex('students')
      .insert({name: jsonParam.name, address: jsonParam.address})
      .returning('id')
      .then(function (response) {
        # Here, I want to insert record to education_histories table
      })
      .catch(function (err) {
        reject(err);
      });
    })
  }

Answer 1

Sorry to answer my own question But I want to explain only that how do i solve.

我们可以通过多种方式进行操作

参考Knex insert docs，我们可以直接将多条记录插入到table，只需将json对象放入数组即可。所以，我们有 jsonParam['education_histories'] 这是一个数组，包含 education_history json 对象。

    var student_id = response[0];
    var educationHistoryParams = jsonParam['education_histories'];

    educationHistoryParams.forEach(function(educationHistory){
       educationHistory.student_id = student_id;
    });

    knex('education_histories').insert(educationHistoryParams)
    .then(resolve());

另一种方法是使用 Bluebird Promise.join API or Bluebird Promise.map API.

    var student_id = response[0];
    var educationHistoryParams = jsonParam['education_histories'];

    return Promise.join(
      educationHistoryParams.forEach(function (educationHistory) {
        educationHistory.student_id = student_id;

        new Promise(function (resolve, reject) {
          knex('education_histories').insert(educationHistory)
          .then(resolve())
          .catch(function (err) {
            reject(err);
          })
        });
      });
    );

嵌套记录插入 knex.js

Nested records insert with knex.js

javascript

node.js

database

bluebird

knex.js