Migrate to new Site registration approach

assets/javascripts/wizard-custom-lib.js

@@ -5,5 +5,3 @@ Wizard.RAW_TEMPLATES = {};
 Discourse.__widget_helpers = {};
 Discourse.RAW_TEMPLATES = {};
 Discourse.SiteSettings = Wizard.SiteSettings;
-Discourse.Model = Ember.Object.extend();
-Discourse.Site = Ember.Object.extend();

assets/javascripts/wizard-custom.js

@@ -31,9 +31,12 @@
 //= require discourse/lib/key-value-store
 //= require discourse/lib/settings
 //= require discourse/lib/user-presence
+//= require discourse/lib/hash
 
 //= require discourse/mixins/singleton
 
+//= require discourse/adapters/rest
+
 //= require discourse/models/login-method
 //= require discourse/models/permission-type
 //= require discourse/models/archetype

assets/javascripts/wizard/initializers/custom.js.es6

@@ -6,6 +6,7 @@ export default {
   initialize(app) {
     if (window.location.pathname.indexOf('/w/') < 0) return;
     
+    const EmberObject = requirejs('@ember/object').default;
     const Router = requirejs('wizard/router').default;
     const ApplicationRoute = requirejs('wizard/routes/application').default;
     const ajax = requirejs('wizard/lib/ajax').ajax;
@@ -22,7 +23,10 @@ export default {
     const Store = requirejs("discourse/models/store").default;
     const registerRawHelpers = requirejs("discourse-common/lib/raw-handlebars-helpers").registerRawHelpers;
     const RawHandlebars = requirejs("discourse-common/lib/raw-handlebars").default;
+    const Site = requirejs("discourse/models/site").default;
+    const RestAdapter = requirejs("discourse/adapters/rest").default;
     
+    Discourse.Model = EmberObject.extend();
     Discourse.__container__ = app.__container__;
     Discourse.getURLWithCDN = getUrl;
     Discourse.getURL = getUrl;
@@ -51,15 +55,15 @@ export default {
     
     app.register("service:store", Store);
     targets.forEach(t => app.inject(t, "store", "service:store"));
-    
-    const site = Discourse.Site;
-    app.register("site:main", site);
-    targets.forEach(t => app.inject(t, "site", "site:main"));
-    
     targets.forEach(t => app.inject(t, "appEvents", "service:app-events"));
     
-    site.reopenClass(Singleton);
-    site.currentProp('can_create_tag', false);
+    app.register("adapter:rest", RestAdapter);
+    
+    const site = Site.current();
+    app.register("site:main", site, { instantiate: false });
+    targets.forEach(t => app.inject(t, "site", "site:main"));
+        
+    site.set('can_create_tag', false);
         
     Router.reopen({
       rootURL: getUrl('/w/')