Ember Data should delegate to the container to normalize the type key.

packages/ember-data/lib/serializers/rest_serializer.js

@@ -723,7 +723,7 @@ var RESTSerializer = JSONSerializer.extend({
     @param {Object} options
   */
   serializeIntoHash: function(hash, type, record, options) {
-    hash[type.typeKey] = this.serialize(record, options);
+    hash[this.typeForRoot(type.typeKey)] = this.serialize(record, options);
   },
 
   /**

packages/ember-data/lib/system/store.js

@@ -9,7 +9,6 @@ import {
   InvalidError,
   Adapter
 } from "ember-data/system/adapter";
-import { singularize } from "ember-inflector/system/string";
 import {
   Map
 } from "ember-data/system/map";
@@ -77,8 +76,6 @@ var Promise = Ember.RSVP.Promise;
 var copy = Ember.copy;
 var Store;
 
-var camelize = Ember.String.camelize;
-
 // Implementors Note:
 //
 //   The variables in this file are consistently named according to the following
@@ -1777,7 +1774,11 @@ Store = Ember.Object.extend({
     @return {String} if the adapter can generate one, an ID
   */
   _normalizeTypeKey: function(key) {
-    return camelize(singularize(key));
+    // Delegate to the container for normalization. The container
+    // requires a ':' to normalize so we add `model:` then slice off
+    // the first 6 characters to remove the `model:` in the return
+    // value
+    return this.container.normalize('model:' + key).slice(6);
   }
 });
 

packages/ember-data/tests/unit/store/create_record_test.js

@@ -42,7 +42,7 @@ test("creating a record by camel-case string finds the model", function() {
   });
 
   equal(record.get('foo'), attributes.foo, "The record is created");
-  equal(store.modelFor('someThing').typeKey, 'someThing');
+  equal(store.modelFor('someThing').typeKey, 'some-thing');
 });
 
 test("creating a record by dasherize string finds the model", function() {
@@ -54,7 +54,7 @@ test("creating a record by dasherize string finds the model", function() {
   });
 
   equal(record.get('foo'), attributes.foo, "The record is created");
-  equal(store.modelFor('some-thing').typeKey, 'someThing');
+  equal(store.modelFor('some-thing').typeKey, 'some-thing');
 });
 
 module("unit/store/createRecord - Store with models by camelCase", {

packages/ember-data/tests/unit/store/model_for_test.js

@@ -28,7 +28,7 @@ test("when fetching factory from string, sets a normalized key as typeKey", func
   env.replaceContainerNormalize(camelize);
 
   equal(container.normalize('some.post'), 'somePost', 'precond - container camelizes');
-  equal(store.modelFor("blog.post").typeKey, "blogPost", "typeKey is normalized to camelCase");
+  equal(store.modelFor("blog.post").typeKey, "blogPost", "typeKey is normalized by the container");
 });
 
 test("when fetching factory from string and dashing normalizer, sets a normalized key as typeKey", function() {
@@ -37,12 +37,12 @@ test("when fetching factory from string and dashing normalizer, sets a normalize
   });
 
   equal(container.normalize('some.post'), 'some-post', 'precond - container dasherizes');
-  equal(store.modelFor("blog.post").typeKey, "blogPost", "typeKey is normalized to camelCase");
+  equal(store.modelFor("blog.post").typeKey, "blog-post", "typeKey is normalized by the container");
 });
 
 test("when returning passed factory, sets a normalized key as typeKey", function() {
   var factory = { typeKey: 'some-thing' };
-  equal(store.modelFor(factory).typeKey, "someThing", "typeKey is normalized to camelCase");
+  equal(store.modelFor(factory).typeKey, "some-thing", "typeKey is normalized to camelCase");
 });
 
 test("when returning passed factory without typeKey, allows it", function() {