Question

我正在尝试设置角度4以使用某些课程填充Firebase数据库。每门课程都有课程。在每节课中都有笔记。

我面临以下问题：

不确定我是否在课程中正确嵌套了笔记，
不确定是否正确分配了lessonRef，
＆＃34;找不到名字＆＃39;课程＆＃39;。任何＆＃34;错误，
＆＃34;找不到姓名＆＃39; lessonRef＆＃39;。任何＆＃34;错误。

我已将评论直接包含在问题所在的代码段上方。任何帮助将不胜感激。

DB-data.ts

export const dbData = {
  "courses": [
    {
      "url": "getting-started-with-angular4",
      "description": "Angular 4 Tutorial For Beginners",
      "lessons": [
        {
          "url": “angular4-write-hello-world”,
          "description": “Write your first Hello World”,

          // not sure if notes is correctly nested
          “notes”: [
             {
              “url”: “angular4-hello-world”,
              “description”: “angular4-hello-world-notes”
             }
           ]

        }
      ]
    }
  ]
};

填入-db.ts

import 'zone.js';
import 'reflect-metadata';
import {database, initializeApp} from "firebase";
import {firebaseConfig} from "./src/environments/firebase.config";
import {dbData} from "./db-data";

initializeApp(firebaseConfig);

const coursesRef = database().ref('courses');
const lessonsRef = database().ref(‘lessons');
const notesRef = database().ref(‘notes’);

dbData.courses.forEach( course => {
  const courseRef = coursesRef.push({
      url: course.url,
      description: course.description
  });


  let lessonKeysPerCourse = [];

  course.lessons.forEach((lesson:any) =>  {
    console.log('adding lesson ', lesson.url);

    // not sure if lessonRef is correctly assigned
    const lessonRef = lessonKeysPerCourse.push(lessonsRef.push({
        url: lesson.url,    
        description: lesson.description,
        courseId: courseRef.key
      }).key); 
 });

  const association = database().ref('lessonsPerCourse');
  const lessonsPerCourse = association.child(courseRef.key);

  lessonKeysPerCourse.forEach(lessonKey => {
    const lessonCourseAssociation = lessonsPerCourse.child(lessonKey);
    lessonCourseAssociation.set(true);
  }); 


  let noteKeysPerLesson = [];

  // Error “cannot find name 'lesson'. any”
  lesson.notes.forEach((note: any) => {
      noteKeysPerLesson.push(notesRef.push({
        url: note.url,
        description: note.description,
        lessonId: lessonRef.key
      }).key);
  });

  const associationNoteLesson = database().ref(‘notesPerLesson');

  // Error “cannot find name 'lessonRef'. any”
  const notesPerLesson = associationNoteLesson.child(lessonRef.Key);

  noteKeysPerLesson.forEach(noteKey => {
      const noteLessonAssociation = notesPerLesson.child(noteKey);
      noteLessonAssociation.set(true);
  })

});

Angular 4填充Firebase数据库错误

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