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| import { observable, computed } from 'mobx' | |
| const store = observable({ | |
| students: observable.map(), | |
| courses: observable.map(), | |
| enrollment: observable.map(), | |
| addStudent(student) { | |
| if (this.students.has(student.id)) { | |
| throw new Error('student already exists') | |
| } else { | |
| this.students.set(student.id, student) | |
| } | |
| }, | |
| updateStudent(student) { | |
| this.students.set(student.id, student) | |
| }, | |
| removeStudent(id) { | |
| this.students.delete(id) | |
| }, | |
| addCourse(course) { | |
| if (this.courses.has(course.id)) { | |
| throw new Error('course already exists') | |
| } else { | |
| this.courses.set(course.id, course) | |
| } | |
| }, | |
| updateCourse(course) { | |
| this.courses.set(course.id, course) | |
| }, | |
| removeCourse(id) { | |
| this.courses.delete(id) | |
| }, | |
| enrollStudent(courseId, studentId) { | |
| if (!this.enrollment.get(courseId)) { | |
| this.enrollment.set(courseId, observable.array([])) | |
| this.enrollment.get(courseId).push(studentId) | |
| } else if (!this.enrollment.get(courseId).includes(studentId)){ | |
| this.enrollment.get(courseId).push(studentId) | |
| } | |
| }, | |
| unenrollStudent(courseId, studentId) { | |
| this.enrollment.get(courseId).remove(studentId) | |
| }, | |
| enrolledStudents(courseId) { | |
| return computed(() => | |
| this.enrollment.get(courseId).map(n => | |
| this.students.get(n))) | |
| .get() | |
| } | |
| }) | |
| export default store |
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