💄 reduce LOC for nested creation

lib/instance.js

@@ -671,13 +671,13 @@ module.exports = (function() {
             return Promise.map(self.options.include.filter(function (include) {
               return !(include.association instanceof BelongsTo);
             }), function (include) {
-              var instances = self.get(include.as)
-                , instance = instances;
+              var instances = self.get(include.as);
 
               if (!instances) return Promise.resolve();
-              if (Array.isArray(instances) && !instances.length) return Promise.resolve();
+              if (!Array.isArray(instances)) instances = [instances];
+              if (!instances.length) return Promise.resolve();
 
-              if (Array.isArray(instances)) {
+              // Instances will be updated in place so we can safely treat HasOne like a HasMany
               return Promise.map(instances, function (instance) {
                 if (include.association instanceof BelongsToMany) {
                   return instance.save({transaction: options.transaction}).then(function () {
@@ -691,10 +691,6 @@ module.exports = (function() {
                   return instance.save({transaction: options.transaction});    
                 }
               });
-              } else {
-                instance.set(include.association.identifier, self.get(self.Model.primaryKeyAttribute, {raw: true}));
-                return instance.save({transaction: options.transaction});
-              }
             });
           });
       });