issue ramiel#45 - implement setNext changes to allow its usage within…

… pre-save hook

lib/sequence.js

@@ -210,9 +210,28 @@ Sequence.prototype._setMethods = function() {
     //     });
     // }.bind(this));
 
-  this._schema.method('setNext', function(id, callback) {
+  /*
+   * #45 allow usage of setNext in pre-save hook prohibits save
+   * add save arg to make save an option ( default )
+   */
+
+  this._schema.method('setNext', function(id, save, callback) {
     var sequence = sequenceArchive.getSequence(id);
 
+    /*
+     * preserve old behaviour, if save is a function means that save arg is the callback function
+     * and in this case set withSave to true to preserve previous behavour
+     */
+
+    var withSave;
+
+    if ( save instanceof Function ) {
+      withSave = true;
+      callback = save;
+    } else {
+      withSave = save;
+    }
+
     if (_.isNull(sequence)) {
       return callback(new Error('Trying to increment a wrong sequence using the id ' + id));
     }
@@ -221,7 +240,12 @@ Sequence.prototype._setMethods = function() {
     sequence._setNextCounter(this, function(err, seq) {
       if (err) return callback(err);
       this[sequence._options.inc_field] = seq;
-      this.save(callback);
+      if (withSave) {
+        this.save(callback);
+      } else {
+        callback();
+      }
+
     }.bind(this));
   });