如何從兩個json之間的陣列中獲取資料？-有解無憂

我有兩個 json 檔案，一個是課程，另一個是講師。課程和講師與 _id 匹配。現在我想要的是當發送講師詳細資訊時，該特定講師的所有課程也會在回應中發送。我應該怎么做？

講師 JSON 資料

let instructorData = [
  {
    _id: 1,
    name: "superman",
    courses: [1,3],
  },{
    _id: 2,
    name: "batman",
    courses: [2],
  }
];

module.exports = {
    instructorData: instructorData,
  };

課程 JSON 資料

let coursesData = [
  {
    _id: 1,
    name: "DC",
    instructor: {
                _id:1
                 },
  },{
    _id: 2,
    name: "Marvel",
    instructor: {
                _id:2
                 },
  },{
    _id: 3,
    name: "DC vs Marvel",
    instructor: {
                _id:1
                 },
  },
];

module.exports = {
    coursesData: coursesData,
  };

對于這里的講師 1，我有 2 門課程。我怎樣才能找到/迭代這 2 門課程？

例如，當我得到一名教練時，我想要這樣：

{ name: "superman",
 courses: [{name: "DC"},{name: "DC vs Marvel"}] 
}

uj5u.com熱心網友回復：

希望這有幫助。

let instructorData = [
    {
        _id: 1,
        name: "superman",
        courses: [1, 3],
    },
    {
        _id: 2,
        name: "batman",
        courses: [2],
    }
];

let coursesData = [
    {
        _id: 1,
        name: "DC",
        instructor: {
            _id: 1
        },
    },
    {
        _id: 2,
        name: "Marvel",
        instructor: {
            _id: 2
        },
    },
    {
        _id: 3,
        name: "DC vs Marvel",
        instructor: {
            _id: 1
        },
    },
];

const getInstructor = id => {
    const found = instructorData.find(instructor => instructor._id == id);
    if (!found) return "Instructor not found!";
    found.courses = found.courses.map(course => coursesData.find(courseData => courseData._id === course));
    return found;
}

console.log(getInstructor(1));
console.log(getInstructor(2));
console.log(getInstructor(3));

uj5u.com熱心網友回復：

我認為您不會以這種方式遇到未找到的錯誤

let instructorData = [
  {
    _id: 1,
    name: "superman",
    courses: [1,3],
  },{
    _id: 2,
    name: "batman",
    courses: [2],
  }
];


let coursesData = [
  {
    _id: 1,
    name: "DC",
    instructor: {
                _id:1
                 },
  },{
    _id: 2,
    name: "Marvel",
    instructor: {
                _id:2
                 },
  },{
    _id: 3,
    name: "DC vs Marvel",
    instructor: {
                _id:1
                 },
  },
];




let instructorCourses = [];
instructorData.forEach((instructor) => {
    let instructorId = instructor._id;
    let instructorCourse = {};
    instructorCourse.instructorId = instructorId;
    instructorCourse.instructorName = instructor.name;
    instructorCourse.courses = [];
    coursesData.forEach((courseD) => {
        let courseInstructorId = courseD.instructor._id;
        if (instructorId === courseInstructorId) {
            let course = {};
            course.courseId = courseD._id;
            course.courseName = courseD.name;
            instructorCourse.courses.push(course);
        }

    });
    instructorCourses.push(instructorCourse);
});

let value = JSON.stringify(instructorCourses, null, "\t");
console.log(value);

轉載請註明出處，本文鏈接：https://www.uj5u.com/qukuanlian/524489.html

標籤：javascript节点.js数组json

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