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Permissions Groupe schema:

mongoose.Schema(
 groupename: type: String, required: true, unique: 'Nom du groupe "VALUE", est déja utiliser',
 permissions: Array
 ,

Service:

 getGroupes(GroupeIds) 
 const headers = new Headers();
 headers.append('Content-type', 'application/json');
 return this.http.get(this.baseUrl + '/groupes/getgroupes/' + GroupeIds, headers: headers)
 .map(res => res.json());
 

view.ts

 getPermissions(ids) 
 let permissions : any = [];
 this.service.getGroupes(ids)
 .subscribe((res) => 
 permessionId = res ;
 let role: any = [];
 permessionId.forEach( (groupe) => 
 role = role.concat(groupe.permissions);
 );
 this.permissions = role;
 , err => 
 console.log(err);
 );
return permissions ;
 

view.html:

<li *ngIf="getPermissions(ids).includes('dashboard')" routerLinkActive="active" class="nav-item">
 <a class="nav-link" [routerLink]="['/dashboard']">
 <i class="material-icons">bar_chart</i>
 <p>Tableau de bord</p>
 </a>
 </li>

so this is just an example, is there any way to call for getPermissions(ids) from html without getting an infinite loop getting the permissions on init is not an option because sometimes cases i need to loop through multiple users

Edit:+

getGroupes(GroupeIds) 
 const headers = new Headers();
 headers.append('Content-type', 'application/json');
 return this.http.get(this.baseUrl + '/groupes/getgroupes/' + GroupeIds, headers: headers)
 .map(res => res.json());
 

Edit2:
if there is any other way to:

<li *ngIf="**check if something exist in database**" routerLinkActive="active" class="nav-item">

that would be a solution

Still not sure about the infinite loop you are talking.

But your getPermissions function has a few things abnormal. this.permissions is referring to a member variable of the class, not the permissions variable inside the function. Also getGroupes is a async function that takes time to finish, and the function will return before that.

I would write like this:

 getPermissions(ids) // return an observable.
 return this.service.getGroupes(ids).pipe(
 map( res => 
 permessionId = res ;
 let role: any = [];
 permessionId.forEach( (groupe) => 
 role = role.concat(groupe.permissions);
 );
 return role;
 )
 )
 

And in HTML use a async pipe get the value:

<li *ngIf="(getPermissions(ids) | async).includes('dashboard')" ......