DS.Errors#has()

Checks if there is error messages for the given attribute.

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    save: function(user) {
       if (user.get('errors').has('email')) {
         return alert('Please update your email before attempting to save.');
       }
       user.save();
     }
  }
});