modal-message actions pattern - part of post: https://medium.com/p/dc024bfa203c

application-route.js

//...

export default Route.extend({
  
  //...

  actions: {
    
    //...
    
    showModalDialog(options) {
      set(this.controllerFor('application'), 'modalOptions', options);
      set(this.controllerFor('application'), 'isShowingModal', true);
    },

    closeModalDialog() {
      set(this.controllerFor('application'), 'isShowingModal', false);
    }
    
    //...
    
  }
});

example-confirm.js

this.send('showModalDialog', {
  type: 'confirm',
  title: 'Delete record?',
  label: 'The record will be deleted, re you sure?',
  mainActionText: 'Delete',
  mainActionPendingText: 'Deleting...',
  mainAction(confirm) {
    if (confirm) {
      // ... proceed to delete logic
    }
  }
});

example-prompt.js

this.send('showModalDialog', {
  type: 'prompt',
  title: 'What\'s your name?',
  mainActionText: 'Save',
  mainActionPendingText: 'Saving...',
  mainAction(name) {
    if (!isEmpty(name)) {
      //... do whatever you want with name
    }
  }
});