angular - Use a service in another service -


i have 2 services :

  • userservice
  • todolistservice

i import todolistservice in userservice, have error :

uncaught error: can't resolve parameters userservice: (?, [object object], [object object], [object object]).

i don't understand, tried move import of barrel , order in constructor, no change ..

my services declared in "providers" in app.module.ts

userservice.ts :

    import {injectable} '@angular/core'; import {angularfiredatabase, firebaselistobservable} "angularfire2/database"; import {facebook} "@ionic-native/facebook"; import {platform} "ionic-angular"; import firebase 'firebase'; import {todolistservice} "./todolistservice";  @injectable() export class userservice {    usersfire: firebaselistobservable<any[]>;   platform: any;   uid: any;   userprofile: = null;    constructor(public db: angularfiredatabase, public fb: facebook, platform: platform, public todolistservice: todolistservice) {     this.usersfire = db.list('/users');     this.platform = platform;     this.uid = '';   }

todolistservice :

    import {injectable} '@angular/core'; import {storage} '@ionic/storage'; import {angularfiredatabase, firebaselistobservable} 'angularfire2/database'; import * moment 'moment'; import 'rxjs/add/operator/map'; import {observable} "rxjs/observable"; import { alertcontroller } 'ionic-angular'; import {userservice} "./userservice";  @injectable() export class todolistservice {    todolistfire: firebaselistobservable<any[]>;   statutfire: firebaselistobservable<any[]>;   localstorage = [];   displaytodo: array<any> = [];   statuts: array<any> = [];    // données à enregistrer dans firebase   dateoftheday: string;   dayofweek: number;    constructor(public afdb: angularfiredatabase, public storage: storage, public alertctrl: alertcontroller, public userservice: userservice) {     moment.locale('fr');     this.dateoftheday = moment().format('l'); // date au format : 04/07/2017     this.dayofweek = moment().day(); // numéro du jour de la semaine (ex : 1 pour lundi)     this.todolistfire = this.afdb.list('/todolist', {       query: {         orderbychild: 'uid',         equalto: this.userservice.uid       }     });     this.statutfire = this.afdb.list('/statut');   }

thanks in advance help


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