Ionic-selectable - Edit mode - unable to select the saved record

I am learning ionic framework. Created a simple user registration screen with gender as ionic-selectable control. able to save the value to database. However, in the edit mode, could not select the saved gender value in the ionic-selectable control.

[(ngModel)]=“service.formData.gender” name=“gender” #gender

The below function return in the user-details.service.ts is used to load the selected row value into the corresponding fields. All text fields are assigned with the values using the two way binding expect ionic-selectable.

this.formData = selectedRecord;