ornek.ts

  ngOnInit() {
    this.route.params.subscribe(params => {
      this.getUser(params.slug);
    });

  }

  getUser(slug: string) {
    this.user$ = this.userPageUserGQL
      .watch({ slug: slug }, {
        fetchPolicy: 'cache-first'
      }).valueChanges.pipe(
        map(result => result.data.user)
      );
  }

  updateTag(obj: any) {
  const pageTitle = `${obj.firstName + ' ' + obj.lastName} (@${obj.userName})`;
  this.seoService.addTitle(pageTitle);
  this.seoService.addDefaultMetaTags();
  this.seoService.meta.updateTag({ property: 'og:title', content: pageTitle });
  this.seoService.meta.updateTag({ property: 'og:description', content: pageTitle });
  this.seoService.meta.updateTag({ name: 'description', content: pageTitle });
  }