Angular and Firebase App

Author: Your Name

src/app/lesson-detail/lesson-detail.component.ts

@@ -28,8 +28,6 @@ export class LessonDetailComponent implements OnInit {
         this.route.params.switchMap(
             params => {
 
-
-
                 const lessonUrl = params['id'];
 
                 return this.lessonsService.findLessonByUrl(lessonUrl);
@@ -42,24 +40,23 @@ export class LessonDetailComponent implements OnInit {
     }
 
     next() {
-
         this.lessonsService.loadNextLesson(this.lesson.courseId,this.lesson.$key)
-            .subscribe(this.nativateToLesson.bind(this));
-
+            .subscribe(this.navigateToLesson.bind(this));
     }
 
     previous() {
-
         this.lessonsService.loadPreviousLesson(this.lesson.courseId,this.lesson.$key)
-            .subscribe(this.nativateToLesson.bind(this));
+            .subscribe(this.navigateToLesson.bind(this));
+    }
 
 
+    navigateToLesson(lesson:Lesson) {
+        this.router.navigate(['lessons', lesson.url]);
     }
 
 
-    nativateToLesson(lesson:Lesson) {
 
-        this.router.navigate(['lessons', lesson.url]);
-    }
+
+
 
 }

src/app/shared/model/lessons.service.ts

@@ -32,7 +32,7 @@ export class LessonsService {
     loadNextLesson(courseId:string, lessonId:string):Observable<Lesson> {
         return this.db.list(`lessonsPerCourse/${courseId}`, {
             query: {
-                orderByKey: true,
+                orderByKey:true,
                 startAt: lessonId,
                 limitToFirst: 2
             }
@@ -46,15 +46,27 @@ export class LessonsService {
     loadPreviousLesson(courseId:string, lessonId:string):Observable<Lesson> {
         return this.db.list(`lessonsPerCourse/${courseId}`, {
             query: {
-                orderByKey: true,
+                orderByKey:true,
                 endAt: lessonId,
                 limitToLast: 2
             }
         })
         .map(results => results[0].$key)
         .switchMap(lessonId => this.db.object(`lessons/${lessonId}`))
         .map(Lesson.fromJson);
+
     }
 
 
 }
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