How to call ngOnInit() again in Angular 2?

If the purpose is to trigger ngOnInit() when query param is updated, then do following:

import { Router } from '@angular/router';
constructor(private router: Router) {
    this.router.routeReuseStrategy.shouldReuseRoute = () => false;
}

There are two options from my point of view:

Calling ngOnInit() from another function scope. But I would suggest to do not adopt this approach given ngOnInitis an angular core method that belongs to OnInit Interface.

    public ngOnInit() {
          this.route.params.subscribe((params: Params) => {
          this.model=this.userData;
      });      
    }
    
    update() {
           this.ngOnInit();
    }  

Break your functionality into another function, use ngOnInitto call it and, afterwards, any request can be made from anywhere by calling the function in the following manner: this.<MethodName>();.

    public ngOnInit() {
          this.getRouteData();
    }
    
    update() {
           this.getRouteData(); 
    }

    getRouteData() {
      this.route.params.subscribe((params: Params) => {
          this.model=this.userData;
      }); 
    }