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POIs it possible in Ember to display a message when there is no model?
 

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    <p>Apologies if this question is very elementary, but I am a first time Ember user and I am working on an app. The app loads a list of visited cities, all of which are links to display recommendations. I have no problems loading the list of cities and linking to them. The problem is clicking on a link which does not have recommendations. I want to be able to detect that there are no recommendations for the city and display a message to the user. I can't quite figure out how to do that. Here is my current setup:</p> <p>Application and Store:</p> <pre><code>window.TR = Ember.Application.create({ LOG_TRANSITIONS: true, LOG_VIEW_LOOKUPS: true, LOG_ACTIVE_GENERATION: true }); Ember.LOG_BINDINGS = true; TR.Store = DS.Store.extend({ revision: 12, adapter: 'DS.FixtureAdapter' }); </code></pre> <p>Models and fixtures:</p> <pre><code>TR.location = DS.Model.extend({ city: DS.attr('string'), state: DS.attr('string'), country: DS.attr('string'), visited: DS.attr('boolean'), recos: DS.hasMany('TR.recos'), locationName: function () { var ret = this.get('city'); if (this.get('state') != null) ret += ', ' + this.get('state'); return ret + ', ' + this.get('country'); } .property('city', 'state', 'country') }); TR.recos = DS.Model.extend({ type: DS.attr('string'), name: DS.attr('string'), address1: DS.attr('string'), address2: DS.attr('string'), city: DS.attr('string'), state: DS.attr('string'), country: DS.attr('string'), postalCode: DS.attr('string'), phone: DS.attr('string'), website: DS.attr('string'), location: DS.belongsTo('TR.location') }); TR.location.FIXTURES = [ { id: 1, city: 'Buenos Aires', country: 'Argentina', visited: true}, { id: 2, city: 'Cordoba', country: 'Argentina', visited: false}, { id: 11, city: 'Sydney', country: 'Australia', visited: false }, { id: 3, city: 'Santiago', country: 'Chile', visited: true}, { id: 4, city: 'Copenhagen', country: 'Denmark', visited: true }, { id: 5, city: 'Paris', country: 'France', visited: true }, { id: 6, city: 'Bombay', country: 'India', visited: false }, { id: 7, city: 'Delhi', country: 'India', visited: false }, { id: 8, city: 'Kolkata', country: 'India', visited: true }, { id: 9, city: 'Mexico City', country: 'Mexico', visited: false }, { id: 10, city: 'Bangkok', country: 'Thailand', visited: false } ]; TR.recos.FIXTURES = [ { id: 100, type: 'Restaurant', name: 'Chez Louis', address1: '123 Main St.', address2: '1st Floor', city: 'Buenos Aires', country: 'Argentina', postalCode: '12345', phone: '2125551234', website: 'http://www.chezlouis.com', location_id: 1 }, { id: 101, type: 'Hotel', name: 'My Hotel', address1: '345 Main St.', city: 'Buenos Aires', country: 'Argentina', postalCode: '12345', phone: '2125551234', website: 'http://www.myhotel.com', location_id: 1 } ]; </code></pre> <p>Routes:</p> <pre><code>TR.Router.map(function () { this.resource('visited', function () { this.route('recos', {path: '/recos/:location_id'}); }); }); TR.VisitedRoute = Ember.Route.extend({ model: function () { TR.location.find(); return TR.location.filter(function (location) { if (location.get('visited')) { return true; } }); }, renderTemplate: function (controller) { this.render('locations', { controller: controller }); } }); TR.VisitedRecosRoute = Ember.Route.extend({ model: function (params) { return TR.recos.find(params.location_id); } }); </code></pre> <p>Controllers:</p> <pre><code>TR.LocationController = Ember.ObjectController.extend({ showRecos: function (location, controller) { controller.parentController.transitionToRoute(controller.parentController.prefix + '.recos', location.get("id")); } }); TR.LocationsController = Ember.ArrayController.extend({ addLocation: function () { var locationVal = this.get('newLocation'); if (!locationVal.trim()) { return; } var location = TR.location.createRecord({ name: locationVal, visited: this.get('visited') }); this.set('newLocation', ''); // Save the new model location.save(); }, itemController: "location" }); TR.VisitedController = TR.LocationsController.extend({ heading: "Places I've Visited", prefix: 'visited', visited: true }); </code></pre> <p>So, with the above code, only recommendations for Buenos Aires should show. For the other cities, a message should show that tells the user that there are no recommendations.</p>
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