component.js

  showDashboardLink: false,

  didReceiveAttrs() {
    console.log("didReceiveAttrs");
    if (this.get('session.isAuthenticated')) {
      return this.get('store').findAll('datasource').then((datasources) => {
        return this.get('store').filter('datasource', {}, function(datasource) {
          return datasource.get('id') != null;
        }).then((datasources) => {
          console.log("datasources.get('length')");
          console.log(datasources.get('length'));
          if (datasources.get('length') != 0) {
            this.set('showDashboardLink', true);
          }
          return datasources;
        });
      });
    };
  },