Able to use sync or async API with cursor

lib/cursor.js

@@ -50,7 +50,7 @@ Cursor.prototype.sort = function(sortQuery) {
  *
  * @param {Function} callback - Signature: err, results
  */
-Cursor.prototype.exec = function(callback) {
+Cursor.prototype._exec = function(callback) {
   var candidates = this.db.getCandidates(this.query)
     , res = [], added = 0, skipped = 0, self = this
     , i
@@ -95,10 +95,9 @@ Cursor.prototype.exec = function(callback) {
   return callback(null, res);
 };
 
-// Cursor.prototype.exec = function () {
+Cursor.prototype.exec = function () {
-  // console.log("=============IN EXEC");
+  this.db.executor.push({ this: this, fn: this._exec, arguments: arguments });
-  // this.db.executor.push({ this: this, fn: this._exec, arguments: arguments });
+};
-// };
 
 
 

lib/datastore.js

@@ -390,7 +390,7 @@ Datastore.prototype.count = function() {
  *
  * @api private Use find
  */
-Datastore.prototype._find = function (query, callback) {
+Datastore.prototype.find = function (query, callback) {
   var cursor = new Cursor(this, query);
 
   if (typeof callback === 'function') {
@@ -400,9 +400,9 @@ Datastore.prototype._find = function (query, callback) {
   }
 };
 
-Datastore.prototype.find = function () {
+// Datastore.prototype.find = function () {
-  this.executor.push({ this: this, fn: this._find, arguments: arguments });
+  // this.executor.push({ this: this, fn: this._find, arguments: arguments });
-};
+// };
 
 
 /**
@@ -411,7 +411,7 @@ Datastore.prototype.find = function () {
  *
  * @api private Use findOne
  */
-Datastore.prototype._findOne = function (query, callback) {
+Datastore.prototype.findOne = function (query, callback) {
   var cursor = new Cursor(this, query);
   cursor.limit(1);
   cursor.exec(function (err, docs) {
@@ -423,9 +423,9 @@ Datastore.prototype._findOne = function (query, callback) {
   });
 };
 
-Datastore.prototype.findOne = function () {
+// Datastore.prototype.findOne = function () {
-  this.executor.push({ this: this, fn: this._findOne, arguments: arguments });
+  // this.executor.push({ this: this, fn: this._findOne, arguments: arguments });
-};
+// };
 
 
 /**
@@ -457,9 +457,11 @@ Datastore.prototype._update = function (query, updateQuery, options, cb) {
   function (cb) {   // If upsert option is set, check whether we need to insert the doc
     if (!upsert) { return cb(); }
 
-    self._findOne(query, function (err, doc) {
+    // Need to use an internal function not tied to the executor to avoid deadlock
+    var cursor = new Cursor(self, query);
+    cursor.limit(1)._exec(function (err, docs) {
       if (err) { return callback(err); }
-      if (doc) {
+      if (docs.length === 1) {
         return cb();
       } else {
         return self._insert(model.modify(query, updateQuery), function (err) {

test/db.test.js

@@ -603,7 +603,7 @@ describe('Database', function () {
       });
     });
     
-    it.only('Can use sort, skip and limit if the callback is not passed to find but to exec', function (done) {
+    it('Can use sort, skip and limit if the callback is not passed to find but to exec', function (done) {
       d.insert({ a: 2, hello: 'world' }, function () {
         d.insert({ a: 24, hello: 'earth' }, function () {
           d.insert({ a: 13, hello: 'blueplanet' }, function () {