Changed findAll to use Promise and return actual group JSON object and not...

Changed findAll to use Promise and return actual group JSON object and not observer containing the object

src/groups/dao/groups.dao.ts

@@ -13,8 +13,13 @@ export class GroupsDao {
     private readonly _groupModel: Model<Group>,
   ) {}
 
-  find = (): Observable<Group[]> =>
-    from(this._groupModel.find({})).pipe(map((groups) => [].concat(groups)));
+  find = (): Promise<Group[]> =>
+    new Promise((resolve, reject) => {
+      this._groupModel.find({}, {}, {}, (err, value) => {
+        if (err) reject(err.message);
+        resolve(value);
+      });
+    });
 
   findById = (id: string): Observable<Group | void> =>
     from(this._groupModel.findById(id));

src/groups/groups.controller.ts

@@ -18,7 +18,7 @@ export class GroupsController {
   constructor(private readonly _groupsService: GroupsService) {}
 
   @Get()
-  findAll(): Observable<GroupEntity[] | void> {
+  findAll(): Promise<GroupEntity[] | void> {
     return this._groupsService.findAll();
   }
 

src/groups/groups.service.ts

@@ -23,12 +23,7 @@ import { GroupEntity } from './entities/group.entity';
 export class GroupsService {
   constructor(private readonly _groupsDao: GroupsDao) {}
 
-  findAll = (): Observable<GroupEntity[] | void> =>
-    this._groupsDao.find().pipe(
-      filter(Boolean),
-      map((groups) => (groups || []).map((group) => new GroupEntity(group))),
-      defaultIfEmpty(undefined),
-    );
+  findAll = (): Promise<GroupEntity[] | void> => this._groupsDao.find();
 
   findOne = (id: string): Observable<GroupEntity> =>
     this._groupsDao.findById(id).pipe(