fix: Use getters to sync BulkWriteResult wrappers (#2716)

Adds getters so that mergeBatchResults changes 
are reflected in wrapper classes.

NODE-3055

src/bulk/common.ts

@@ -165,50 +165,51 @@ export class Batch<T = Document> {
 export class BulkWriteResult {
   result: BulkResult;
 
-  /** Indicates whether this write result was acknowledged. If not, then all other members of this result will be undefined */
-  // acknowledged: Boolean;
-  /** Number of documents inserted. */
-  insertedCount: number;
-  /** Number of documents matched for update. */
-  matchedCount: number;
-  /** Number of documents modified. */
-  modifiedCount: number;
-  /** Number of documents deleted. */
-  deletedCount: number;
-  /** Number of documents upserted. */
-  upsertedCount: number;
-  /** Inserted document generated Id's, hash key is the index of the originating operation */
-  insertedIds: { [key: number]: ObjectId };
-  /** Upserted document generated Id's, hash key is the index of the originating operation */
-  upsertedIds: { [key: number]: ObjectId };
-
   /**
    * Create a new BulkWriteResult instance
    * @internal
    */
   constructor(bulkResult: BulkResult) {
     this.result = bulkResult;
-    this.insertedCount = bulkResult.nInserted;
-    this.matchedCount = bulkResult.nMatched;
-    this.modifiedCount = bulkResult.nModified || 0;
-    this.deletedCount = bulkResult.nRemoved;
-    this.upsertedCount = bulkResult.upserted.length;
-    this.upsertedIds = {};
-    this.insertedIds = {};
-
-    // Inserted documents
-    const inserted = bulkResult.insertedIds;
-    // Map inserted ids
-    for (let i = 0; i < inserted.length; i++) {
-      this.insertedIds[inserted[i].index] = inserted[i]._id;
+  }
+
+  /** Number of documents inserted. */
+  get insertedCount(): number {
+    return this.result.nInserted ?? 0;
+  }
+  /** Number of documents matched for update. */
+  get matchedCount(): number {
+    return this.result.nMatched ?? 0;
+  }
+  /** Number of documents modified. */
+  get modifiedCount(): number {
+    return this.result.nModified ?? 0;
+  }
+  /** Number of documents deleted. */
+  get deletedCount(): number {
+    return this.result.nRemoved ?? 0;
+  }
+  /** Number of documents upserted. */
+  get upsertedCount(): number {
+    return this.result.upserted.length ?? 0;
+  }
+
+  /** Upserted document generated Id's, hash key is the index of the originating operation */
+  get upsertedIds(): { [key: number]: any } {
+    const upserted: { [index: number]: any } = {};
+    for (const doc of this.result.upserted ?? []) {
+      upserted[doc.index] = doc._id;
     }
+    return upserted;
+  }
 
-    // Upserted documents
-    const upserted = bulkResult.upserted;
-    // Map upserted ids
-    for (let i = 0; i < upserted.length; i++) {
-      this.upsertedIds[upserted[i].index] = upserted[i]._id;
+  /** Inserted document generated Id's, hash key is the index of the originating operation */
+  get insertedIds(): { [key: number]: any } {
+    const inserted: { [index: number]: any } = {};
+    for (const doc of this.result.insertedIds ?? []) {
+      inserted[doc.index] = doc._id;
     }
+    return inserted;
   }
 
   /** Evaluates to true if the bulk operation correctly executes */
@@ -674,36 +675,42 @@ function handleMongoWriteConcernError(
 export class MongoBulkWriteError extends MongoError {
   result: BulkWriteResult;
 
-  /** Number of documents inserted. */
-  insertedCount: number;
-  /** Number of documents matched for update. */
-  matchedCount: number;
-  /** Number of documents modified. */
-  modifiedCount: number;
-  /** Number of documents deleted. */
-  deletedCount: number;
-  /** Number of documents upserted. */
-  upsertedCount: number;
-  /** Inserted document generated Id's, hash key is the index of the originating operation */
-  insertedIds: { [key: number]: ObjectId };
-  /** Upserted document generated Id's, hash key is the index of the originating operation */
-  upsertedIds: { [key: number]: ObjectId };
-
   /** Creates a new MongoBulkWriteError */
   constructor(error: AnyError, result: BulkWriteResult) {
     super(error as Error);
     Object.assign(this, error);
 
     this.name = 'MongoBulkWriteError';
     this.result = result;
+  }
 
-    this.insertedCount = result.insertedCount;
-    this.matchedCount = result.matchedCount;
-    this.modifiedCount = result.modifiedCount;
-    this.deletedCount = result.deletedCount;
-    this.upsertedCount = result.upsertedCount;
-    this.insertedIds = result.insertedIds;
-    this.upsertedIds = result.upsertedIds;
+  /** Number of documents inserted. */
+  get insertedCount(): number {
+    return this.result.insertedCount;
+  }
+  /** Number of documents matched for update. */
+  get matchedCount(): number {
+    return this.result.matchedCount;
+  }
+  /** Number of documents modified. */
+  get modifiedCount(): number {
+    return this.result.modifiedCount;
+  }
+  /** Number of documents deleted. */
+  get deletedCount(): number {
+    return this.result.deletedCount;
+  }
+  /** Number of documents upserted. */
+  get upsertedCount(): number {
+    return this.result.upsertedCount;
+  }
+  /** Inserted document generated Id's, hash key is the index of the originating operation */
+  get insertedIds(): { [key: number]: any } {
+    return this.result.insertedIds;
+  }
+  /** Upserted document generated Id's, hash key is the index of the originating operation */
+  get upsertedIds(): { [key: number]: any } {
+    return this.result.upsertedIds;
   }
 }
 

test/functional/insert.test.js

@@ -1,5 +1,5 @@
 'use strict';
-const { assert: test, withClient } = require('./shared');
+const { assert: test, withClient, ignoreNsNotFound } = require('./shared');
 const { setupDatabase } = require('./shared');
 const Script = require('vm');
 const { expect } = require('chai');
@@ -15,7 +15,8 @@ const {
   Binary,
   MinKey,
   MaxKey,
-  Code
+  Code,
+  MongoBulkWriteError
 } = require('../../src');
 
 /**
@@ -2583,4 +2584,45 @@ describe('Insert', function () {
       });
     }
   });
+
+  it('MongoBulkWriteError and BulkWriteResult should respect BulkWrite', function () {
+    const client = this.configuration.newClient();
+    return client
+      .connect()
+      .then(() => {
+        return client.db().collection('test_insertMany_bulkResult').drop();
+      })
+      .catch(ignoreNsNotFound)
+      .then(() => {
+        const collection = client.db().collection('test_insertMany_bulkResult');
+        return collection.insertMany(
+          [
+            { _id: 2, x: 22 },
+            { _id: 2, x: 22 },
+            { _id: 3, x: 33 }
+          ],
+          { ordered: false }
+        );
+      })
+      .then(() => {
+        expect.fail('InsertMany should fail with multi key error');
+      })
+      .catch(error => {
+        expect(error).to.be.instanceOf(MongoBulkWriteError);
+        expect(
+          error.insertedCount,
+          'MongoBulkWriteError.insertedCount did not respect BulkResult.nInserted'
+        ).to.equal(error.result.result.nInserted);
+        expect(
+          error.result.insertedCount,
+          'BulkWriteResult.insertedCount did not respect BulkResult.nInserted'
+        ).to.equal(error.result.result.nInserted);
+        expect(
+          error.result.result.nInserted,
+          'BulkWrite did not correctly represent the operation'
+        ).to.equal(2);
+      })
+      .finally(() => client.db().collection('test_insertMany_bulkResult').drop())
+      .finally(() => client.close());
+  });
 });