chore(release): 9.1.0-alpha.4 [skip ci]

# [9.1.0-alpha.4](https://github.com/parse-community/parse-server/compare/9.1.0-alpha.3...9.1.0-alpha.4) (2025-12-14)

### Features

* Log more debug info when failing to set duplicate value for field with unique values ([#9919](https://github.com/parse-community/parse-server/issues/9919)) ([a23b192](a23b192466))

changelogs/CHANGELOG_alpha.md

@@ -1,3 +1,10 @@
+# [9.1.0-alpha.4](https://github.com/parse-community/parse-server/compare/9.1.0-alpha.3...9.1.0-alpha.4) (2025-12-14)
+
+
+### Features
+
+* Log more debug info when failing to set duplicate value for field with unique values ([#9919](https://github.com/parse-community/parse-server/issues/9919)) ([a23b192](https://github.com/parse-community/parse-server/commit/a23b1924668920f3c92fec0566b57091d0e8aae8))
+
 # [9.1.0-alpha.3](https://github.com/parse-community/parse-server/compare/9.1.0-alpha.2...9.1.0-alpha.3) (2025-12-14)
 
 

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "parse-server",
-  "version": "9.1.0-alpha.3",
+  "version": "9.1.0-alpha.4",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "parse-server",
-      "version": "9.1.0-alpha.3",
+      "version": "9.1.0-alpha.4",
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "parse-server",
-  "version": "9.1.0-alpha.3",
+  "version": "9.1.0-alpha.4",
   "description": "An express module providing a Parse-compatible API server",
   "main": "lib/index.js",
   "repository": {

spec/schemas.spec.js

@@ -3842,6 +3842,7 @@ describe('schemas', () => {
     });
 
     it_id('cbd5d897-b938-43a4-8f5a-5d02dd2be9be')(it_exclude_dbs(['postgres']))('cannot update to duplicate value on unique index', done => {
+      loggerErrorSpy.calls.reset();
       const index = {
         code: 1,
       };
@@ -3868,6 +3869,12 @@ describe('schemas', () => {
         .then(done.fail)
         .catch(error => {
           expect(error.code).toEqual(Parse.Error.DUPLICATE_VALUE);
+          // Client should only see generic message (no schema info exposed)
+          expect(error.message).toEqual('A duplicate value for a field with unique values was provided');
+          // Server logs should contain full MongoDB error message with detailed information
+          expect(loggerErrorSpy).toHaveBeenCalledWith('Duplicate key error:', jasmine.stringContaining('E11000 duplicate key error'));
+          expect(loggerErrorSpy).toHaveBeenCalledWith('Duplicate key error:', jasmine.stringContaining('test_UniqueIndexClass'));
+          expect(loggerErrorSpy).toHaveBeenCalledWith('Duplicate key error:', jasmine.stringContaining('code_1'));
           done();
         });
     });

src/Adapters/Storage/Mongo/MongoStorageAdapter.js

@@ -519,7 +519,7 @@ export class MongoStorageAdapter implements StorageAdapter {
       .then(() => ({ ops: [mongoObject] }))
       .catch(error => {
         if (error.code === 11000) {
-          // Duplicate value
+          logger.error('Duplicate key error:', error.message);
           const err = new Parse.Error(
             Parse.Error.DUPLICATE_VALUE,
             'A duplicate value for a field with unique values was provided'
@@ -605,6 +605,7 @@ export class MongoStorageAdapter implements StorageAdapter {
       .then(result => mongoObjectToParseObject(className, result, schema))
       .catch(error => {
         if (error.code === 11000) {
+          logger.error('Duplicate key error:', error.message);
           throw new Parse.Error(
             Parse.Error.DUPLICATE_VALUE,
             'A duplicate value for a field with unique values was provided'