Fix an issue with the store hydrating embedded objects

app/assets/javascripts/discourse/models/store.js.es6

@@ -8,6 +8,32 @@ function flushMap() {
   _identityMap = {};
 }
 
+function storeMap(type, id, obj) {
+  if (!id) { return; }
+
+  _identityMap[type] = _identityMap[type] || {};
+  _identityMap[type][id] = obj;
+}
+
+function fromMap(type, id) {
+  const byType = _identityMap[type];
+  if (byType) { return byType[id]; }
+}
+
+function removeMap(type, id) {
+  const byType = _identityMap[type];
+  if (byType) { delete byType[id]; }
+}
+
+function findAndRemoveMap(type, id) {
+  const byType = _identityMap[type];
+  if (byType) {
+    const result = byType[id];
+    delete byType[id];
+    return result;
+  }
+}
+
 flushMap();
 
 export default Ember.Object.extend({
@@ -63,9 +89,8 @@ export default Ember.Object.extend({
   update(type, id, attrs) {
     return this.adapterFor(type).update(this, type, id, attrs, function(result) {
       if (result && result[type] && result[type].id) {
-        const oldRecord = _identityMap[type][id];
-        delete _identityMap[type][id];
-        _identityMap[type][result[type].id] = oldRecord;
+        const oldRecord = findAndRemoveMap(type, id);
+        storeMap(type, result[type].id, oldRecord);
       }
       return result;
     });
@@ -78,8 +103,7 @@ export default Ember.Object.extend({
 
   destroyRecord(type, record) {
     return this.adapterFor(type).destroyRecord(this, type, record).then(function(result) {
-      const forType = _identityMap[type];
-      if (forType) { delete forType[record.get('id')]; }
+      removeMap(type, record.get('id'));
       return result;
     });
   },
@@ -101,9 +125,7 @@ export default Ember.Object.extend({
     const klass = this.container.lookupFactory('model:' + type) || RestModel;
     const model = klass.create(obj);
 
-    if (obj.id) {
-      _identityMap[type][obj.id] = model;
-    }
+    storeMap(type, obj.id, model);
     return model;
   },
 
@@ -118,11 +140,24 @@ export default Ember.Object.extend({
       return Discourse.Category.findById(id);
     }
 
+    const pluralType = this.pluralize(subType);
     const collection = root[this.pluralize(subType)];
     if (collection) {
-      const found = collection.findProperty('id', id);
+      const hashedProp = "__hashed_" + pluralType;
+      let hashedCollection = root[hashedProp];
+      if (!hashedCollection) {
+        hashedCollection = {};
+        collection.forEach(function(it) {
+          hashedCollection[it.id] = it;
+        });
+        root[hashedProp] = hashedCollection;
+      }
+
+      const found = hashedCollection[id];
       if (found) {
-        return this._hydrate(subType, found, root);
+        const hydrated = this._hydrate(subType, found, root);
+        hashedCollection[id] = hydrated;
+        return hydrated;
       }
     }
   },
@@ -154,9 +189,7 @@ export default Ember.Object.extend({
       this._hydrateEmbedded(obj, root);
     }
 
-    _identityMap[type] = _identityMap[type] || {};
-
-    const existing = _identityMap[type][obj.id];
+    const existing = fromMap(type, obj.id);
     if (existing === obj) { return existing; }
 
     if (existing) {

test/javascripts/helpers/create-pretender.js.es6

@@ -39,6 +39,13 @@ const _moreWidgets = [
   {id: 224, name: 'Good Repellant'}
 ];
 
+const fruits = [{id: 1, name: 'apple', farmer_id: 1, category_id: 4},
+                {id: 2, name: 'banana', farmer_id: 1, category_id: 3},
+                {id: 3, name: 'grape', farmer_id: 2, category_id: 5}];
+
+const farmers = [{id: 1, name: 'Old MacDonald'},
+                 {id: 2, name: 'Luke Skywalker'}];
+
 function loggedIn() {
   return !!Discourse.User.current();
 }
@@ -178,11 +185,13 @@ export default function() {
     });
 
     this.get('/fruits/:id', function() {
-      return response({
-        __rest_serializer: "1",
-        fruit: {id: 1, name: 'apple', farmer_id: 1},
-        farmers: [{id: 1, name: 'Evil Trout'}]
-      });
+      const fruit = fruits[0];
+
+      return response({ __rest_serializer: "1", fruit, farmers: [farmers[0]] });
+    });
+
+    this.get('/fruits', function() {
+      return response({ __rest_serializer: "1", fruits, farmers });
     });
 
     this.get('/widgets/:widget_id', function(request) {

test/javascripts/models/store-test.js.es6

@@ -93,6 +93,15 @@ test('find embedded', function() {
   const store = createStore();
   store.find('fruit', 1).then(function(f) {
     ok(f.get('farmer'), 'it has the embedded object');
+    ok(f.get('category'), 'categories are found automatically');
   });
 });
 
+test('findAll embedded', function() {
+  const store = createStore();
+  store.findAll('fruit').then(function(fruits) {
+    equal(fruits.objectAt(0).get('farmer.name'), 'Old MacDonald');
+    equal(fruits.objectAt(0).get('farmer'), fruits.objectAt(1).get('farmer'), 'points at the same object');
+    equal(fruits.objectAt(2).get('farmer.name'), 'Luke Skywalker');
+  });
+});