Merge pull request #60 from nassor/revert-59-master

Revert "change pre to post (findOneAndUpdate)"

lib/mongoose-history.js

@@ -95,8 +95,8 @@ module.exports = function historyPlugin(schema, options) {
   });
 
   // Listen on findOneAndUpdate
-  schema.post('findOneAndUpdate', function (doc, next) {
-    if (doc) { processPostUpdate.call(this, doc, next) } else { return next(); }
+  schema.pre('findOneAndUpdate', function (next) {
+      processUpdate.call(this, next);
   });
 
   // Create a copy on remove
@@ -143,13 +143,6 @@ module.exports = function historyPlugin(schema, options) {
     saveHistoryModel(this.toObject, d, historyDoc, this.mongooseCollection.collectionName, next);
   }
 
-  function processPostUpdate(doc, next) {
-    let d = this._update.$set || this._update;
-    let historyDoc = createHistoryDoc(d, 'u');
-
-    saveHistoryModel(this.toObject, d, historyDoc, this.mongooseCollection.collectionName, next);
-  }
-
   function processRemove(doc, next) {
     let d = doc.toObject();
     let historyDoc = createHistoryDoc(d, 'r');