75 lines
2.2 KiB
JavaScript
75 lines
2.2 KiB
JavaScript
const Score = require('../models/Score');
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const Student = require('../models/Student');
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const Course = require('../models/Course');
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class StudentService {
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static async getStudentCourses(userId) {
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const student = await Student.findById(userId);
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if (!student) {
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throw new Error('学生信息不存在');
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}
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const courses = await Course.findByStudentId(userId);
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return courses;
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}
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static async getCourseDetails(courseId) {
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const course = await Course.findDetailsById(courseId);
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if (!course) {
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throw new Error('课程不存在');
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}
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return course;
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}
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static async getStudentGrades(userId) {
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// 先通过 userId 获取 studentId
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// 假设 users.id = students.id，或者通过 user_id 关联
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// 根据之前的 authService，我们假设 users.id 就是 students.id
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// 确认学生是否存在
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const student = await Student.findById(userId);
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if (!student) {
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throw new Error('学生信息不存在');
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}
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const grades = await Score.findByStudentId(userId);
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// 计算统计信息
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let totalCredits = 0;
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let totalGradePoints = 0;
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const totalCourses = grades.length;
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grades.forEach(grade => {
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const credit = parseFloat(grade.credit);
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totalCredits += credit;
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if (grade.grade_point) {
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totalGradePoints += parseFloat(grade.grade_point) * credit;
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}
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});
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const gpa = totalCredits > 0 ? (totalGradePoints / totalCredits).toFixed(2) : 0;
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const averageScore = totalCourses > 0 ?
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(grades.reduce((sum, g) => sum + parseFloat(g.score || 0), 0) / totalCourses).toFixed(1) : 0;
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return {
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grades,
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statistics: {
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totalCourses,
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totalCredits,
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gpa,
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averageScore
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}
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};
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}
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static async getGradeDetails(scoreId, userId) {
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const grade = await Score.findDetailsById(scoreId, userId);
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if (!grade) {
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throw new Error('成绩不存在');
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}
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return grade;
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}
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}
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module.exports = StudentService; |