Ghost-Admin/app/routes/signin.js

// TODO: remove usage of Ember Data's private `Errors` class when refactoring validations
// eslint-disable-next-line
import DS from 'ember-data';
import EmberObject from '@ember/object';
import Route from '@ember/routing/route';
import UnauthenticatedRouteMixin from 'ghost-admin/mixins/unauthenticated-route-mixin';

const {Errors} = DS;

const defaultModel = function defaultModel() {
    return EmberObject.create({
        identification: '',
        password: '',
        errors: Errors.create()
    });
};

export default Route.extend(UnauthenticatedRouteMixin, {
    model() {
        return defaultModel();
    },

    // the deactivate hook is called after a route has been exited.
    deactivate() {
        let controller = this.controllerFor('signin');

        this._super(...arguments);

        // clear the properties that hold the credentials when we're no longer on the signin screen
        controller.set('signin', defaultModel());
    },

    buildRouteInfoMetadata() {
        return {
            titleToken: 'Sign In',
            bodyClasses: ['unauthenticated-route']
        };
    }
});