diff --git a/backend/model/mongoose/MongoGalleryManager.ts b/backend/model/mongoose/MongoGalleryManager.ts
index ae3c3357..735702a8 100644
--- a/backend/model/mongoose/MongoGalleryManager.ts
+++ b/backend/model/mongoose/MongoGalleryManager.ts
@@ -16,7 +16,7 @@ export class MongoGalleryManager implements IGalleryManager{
         let directoryName = path.basename(relativeDirectoryName);
         let directoryParent = path.join( path.dirname(relativeDirectoryName),"/");
 
-        DirectoryModel.findOne({name:directoryName, path: directoryParent}).populate('photos').populate('directories').exec( (err,res) =>{
+        DirectoryModel.findOne({name:directoryName, path: directoryParent}).populate('photos').populate('directories').exec( (err,res:any) =>{
             if(err || !res){
                 return  this.indexDirectory(relativeDirectoryName,cb);
             }
diff --git a/backend/model/mongoose/MongoSearchManager.ts b/backend/model/mongoose/MongoSearchManager.ts
index c9f7f59f..d781c23a 100644
--- a/backend/model/mongoose/MongoSearchManager.ts
+++ b/backend/model/mongoose/MongoSearchManager.ts
@@ -14,13 +14,13 @@ export class MongoSearchManager implements ISearchManager{
 
         console.log("autocomplete: " + text);
         let items:Array<AutoCompleteItem> = [];
-        PhotoModel.find({name:  { $regex: text, $options: "i" } }).limit(10).select('name').exec( (err,res) =>{
+        PhotoModel.find({name:  { $regex: text, $options: "i" } }).limit(10).select('name').exec( (err,res:Array<any>) =>{
             if(err || !res){
                 return cb(err,null);
             }
             items = items.concat(this.encapsulateAutoComplete(res.map(r => r.name),AutoCompeleteTypes.image));
 
-            DirectoryModel.find({name:  { $regex: text, $options: "i" } }).limit(10).select('name').exec( (err,res) =>{
+            DirectoryModel.find({name:  { $regex: text, $options: "i" } }).limit(10).select('name').exec( (err,res:Array<any>) =>{
                 if(err || !res){
                     return cb(err,null);
                 }
diff --git a/backend/model/mongoose/MongoUserManager.ts b/backend/model/mongoose/MongoUserManager.ts
index 3b772610..89e724fd 100644
--- a/backend/model/mongoose/MongoUserManager.ts
+++ b/backend/model/mongoose/MongoUserManager.ts
@@ -9,13 +9,13 @@ export class MongoUserManager implements IUserManager {
     }
 
     public findOne(filter, cb:(error:any, result:User) => void) {
-        return UserModel.findOne(filter, function (err, result) {
+        return UserModel.findOne(filter, function (err, result:any) {
             return cb(err, result);
         });
     }
 
     public find(filter, cb:(error:any, result:Array<User>) => void) {
-        UserModel.find(filter, function (err, result) {
+        UserModel.find(filter, function (err, result:Array<any>) {
             return cb(err, result);
         });
     }
diff --git a/common/entities/Directory.ts b/common/entities/Directory.ts
index 22d512bb..3a439967 100644
--- a/common/entities/Directory.ts
+++ b/common/entities/Directory.ts
@@ -1,10 +1,10 @@
 import {Photo} from "./Photo";
 export class Directory{
     
-    constructor(public id?:string,
+    constructor(public id?:number,
                 public name?:string,
                 public path?:string,
                 public lastUpdate?:Date,
-                public directories:Array<Directory>  = [],
+                public directories:Array<Directory> =[],
                 public photos:Array<Photo> = []){}
 }
\ No newline at end of file
diff --git a/common/entities/Photo.ts b/common/entities/Photo.ts
index af94fe59..0074d003 100644
--- a/common/entities/Photo.ts
+++ b/common/entities/Photo.ts
@@ -1,7 +1,7 @@
 import {Utils} from "../Utils";
 import {Directory} from "./Directory";
 export class Photo {
-    constructor(public id:string, public name:string, public width:number, public height:number) {
+    constructor(public id:number, public name:string, public width:number, public height:number) {
     }
 
     public static getThumbnailPath(directory:Directory,photo:Photo){
diff --git a/common/entities/User.ts b/common/entities/User.ts
index 873407b0..9954e996 100644
--- a/common/entities/User.ts
+++ b/common/entities/User.ts
@@ -8,5 +8,5 @@ export enum UserRoles{
 }
 
 export class User { 
-    constructor(public id?:string,public name?:string, public password?:string, public role:UserRoles = UserRoles.User){}
+    constructor(public id?:number,public name?:string, public password?:string, public role:UserRoles = UserRoles.User){}
 }
\ No newline at end of file