Return updated docs tested

lib/datastore.js

@@ -476,12 +476,12 @@ Datastore.prototype.findOne = function (query, projection, callback) {
 
 /**
  * Update all docs matching query
- * For now, very naive implementation (recalculating the whole database)
  * @param {Object} query
  * @param {Object} updateQuery
  * @param {Object} options Optional options
  *                 options.multi If true, can update multiple documents (defaults to false)
  *                 options.upsert If true, document is inserted if the query doesn't match anything
+ *                 options.returnUpdatedDocs Defaults to false, if true return as third argument the array of updated matched documents (even if no change actually took place)
  * @param {Function} cb Optional callback, signature: err, numReplaced, upsert (set to true if the update was in fact an upsert)
  *
  * @api private Use Datastore.update which has the same signature
@@ -562,9 +562,16 @@ Datastore.prototype._update = function (query, updateQuery, options, cb) {
     }
 
     // Update the datafile
-    self.persistence.persistNewState(_.pluck(modifications, 'newDoc'), function (err) {
+    var updatedDocs = _.pluck(modifications, 'newDoc');
+    self.persistence.persistNewState(updatedDocs, function (err) {
       if (err) { return callback(err); }
+      if (!options.returnUpdatedDocs) {
         return callback(null, numReplaced);
+      } else {
+        var updatedDocsDC = [];
+        updatedDocs.forEach(function (doc) { updatedDocsDC.push(model.deepCopy(doc)); });
+        return callback(null, numReplaced, updatedDocsDC);
+      }
     });
   }
   ]);

test/db.test.js

@@ -1477,6 +1477,40 @@ describe('Database', function () {
       });
     });
 
+    it("If options.returnUpdatedDocs is true, return all matched docs", function (done) {
+      d.insert([{ a: 4 }, { a: 5 }, { a: 6 }], function (err, docs) {
+        docs.length.should.equal(3);
+
+        d.update({ a: 7 }, { $set: { u: 1 } }, { multi: true, returnUpdatedDocs: true }, function (err, num, updatedDocs) {
+          num.should.equal(0);
+          updatedDocs.length.should.equal(0);
+
+          d.update({ a: 5 }, { $set: { u: 2 } }, { multi: true, returnUpdatedDocs: true }, function (err, num, updatedDocs) {
+            num.should.equal(1);
+            updatedDocs.length.should.equal(1);
+            updatedDocs[0].a.should.equal(5);
+            updatedDocs[0].u.should.equal(2);
+
+            d.update({ a: { $in: [4, 6] } }, { $set: { u: 3 } }, { multi: true, returnUpdatedDocs: true }, function (err, num, updatedDocs) {
+              num.should.equal(2);
+              updatedDocs.length.should.equal(2);
+              updatedDocs[0].u.should.equal(3);
+              updatedDocs[1].u.should.equal(3);
+              if (updatedDocs[0].a === 4) {
+                updatedDocs[0].a.should.equal(4);
+                updatedDocs[1].a.should.equal(6);
+              } else {
+                updatedDocs[0].a.should.equal(6);
+                updatedDocs[1].a.should.equal(4);
+              }
+
+              done();
+            });
+          });
+        });
+      });
+    });
+
   });   // ==== End of 'Update' ==== //