Allow passing opts including writeOps to save

README.md

@@ -294,7 +294,7 @@ Apply a query and get one single document passed as a callback. The callback rec
 
 #####`db.collection.runCommand(command, [callback])`
 
-#####`db.collection.save(doc, [callback])`
+#####`db.collection.save(doc, [options], [callback])`
 
 #####`db.collection.stats(callback)`
 

lib/collection.js

@@ -107,16 +107,18 @@ Collection.prototype.update = function (query, update, opts, cb) {
   })
 }
 
-Collection.prototype.save = function (doc, cb) {
-  if (!cb) { return this.save(doc, noop) }
+Collection.prototype.save = function (doc, opts, cb) {
+  if (!opts && !cb) return this.save(doc, {}, noop)
+  if (typeof opts === 'function') return this.save(doc, {}, opts)
+  if (!cb) return this.save(doc, opts, noop)
 
   if (doc._id) {
-    this.update({_id: doc._id}, doc, {upsert: true}, function (err) {
+    this.update({_id: doc._id}, doc, xtend({upsert: true}, opts), function (err) {
       if (err) return cb(err)
       cb(null, doc)
     })
   } else {
-    this.insert(doc, cb)
+    this.insert(doc, opts, cb)
   }
 }