fix casing in patch command payload; add advanced patching example

Author: gregolsky

README.md

@@ -10,6 +10,7 @@ Added support for the following features:
 - More like this
 - [Suggestions](#suggestions)
 - [Revisions](#revisions)
+- [Advanced patching](#advanced-patching)
 
 ### 4.0.2 - 2018-09-14
 Added support for the following features:
@@ -736,6 +737,12 @@ const suggestionQueryResult = await session.query({ collection: "users" })
 // { name: { name: 'name', suggestions: [ 'john' ] } }
 ```
 
+### Advanced patching
+```javascript
+session.advanced.increment("users/1", "age", 1);
+session.advanced.patch("users/1", "underAge", false);
+await session.saveChanges();
+```
 
 ## Using object literals for entities
 

src/Documents/Operations/PatchOperation.ts

@@ -18,6 +18,7 @@ import { pick } from "stream-json/filters/Pick";
 import { filter } from "stream-json/filters/Filter";
 import { ignore } from "stream-json/filters/Ignore";
 import { parseRestOfOutput } from "../../Mapping/Json/Streams/Pipelines";
+import { ObjectUtil } from "../../Utility/ObjectUtil";
 
 export interface Payload {
     patch: PatchRequest;
@@ -128,7 +129,17 @@ export class PatchCommand extends RavenCommand<PatchResult> {
 
         this._id = id;
         this._changeVector = changeVector;
-        this._patch = conventions.objectMapper.toObjectLiteral({ patch, patchIfMissing });
+        this._patch = ObjectUtil.transformObjectKeys(
+            conventions.objectMapper.toObjectLiteral({ patch, patchIfMissing }),
+            {
+                defaultTransform: "pascal",
+                paths: [
+                    {
+                        transform: conventions.remoteEntityFieldNameConvention,
+                        path: /Values/i
+                    }
+                ]
+            });
         this._skipPatchIfChangeVectorMismatch = skipPatchIfChangeVectorMismatch;
         this._returnDebugInformation = returnDebugInformation;
         this._test = test;
@@ -154,7 +165,7 @@ export class PatchCommand extends RavenCommand<PatchResult> {
             uri += "&test=true";
         }
 
-        const body = this._serializer.serialize(this._patch);
+        const body = JSON.stringify(this._patch);
         const req = {
             method: "PATCH",
             uri,

test/Ported/Server/Patching/AdvancedPatchingTest.ts

@@ -20,7 +20,7 @@ describe("AdvancedPatchingTest", function () {
     afterEach(async () =>
         await disposeTestDocumentStore(store));
 
-    it.skip("can test with variables", async () => {
+    it("can test with variables", async () => {
 
         {
             const session = store.openSession();