wait for the unset queries

lib/associations/has-many-single-linked.js

@@ -18,16 +18,15 @@ module.exports = (function() {
   HasManySingleLinked.prototype.injectSetter = function(emitter, oldAssociations, newAssociations) {
     var self    = this
       , options = this.__factory.options
+      , chainer = new Utils.QueryChainer()
 
     // clear the old associations
     oldAssociations.forEach(function(associatedObject) {
       associatedObject[self.__factory.identifier] = options.omitNull ? '' : null
-      associatedObject.save()
+      chainer.add(associatedObject.save())
     })
 
-    // set the new one
-    var chainer = new Utils.QueryChainer()
-
+    // set the new associations
     newAssociations.forEach(function(associatedObject) {
       associatedObject[self.__factory.identifier] = self.instance.id
       chainer.add(associatedObject.save())