Merge pull request #2806 from seegno/bugfix/add-unique-keys-check

Add unique keys check to postgres

lib/dialects/postgres/query.js

@@ -275,12 +275,14 @@ module.exports = (function() {
               field + ' must be unique', 'unique violation', field, value));
           });
 
-          Utils._.forOwn(this.callee.__options.uniqueKeys, function(constraint) {
-            if (Utils._.isEqual(constraint.fields, Object.keys(fields)) && !!constraint.msg) {
-              message = constraint.msg;
-              return false;
-            }
-          });
+          if (this.callee.__options && this.callee.__options.uniqueKeys) {
+            Utils._.forOwn(this.callee.__options.uniqueKeys, function(constraint) {
+              if (Utils._.isEqual(constraint.fields, Object.keys(fields)) && !!constraint.msg) {
+                message = constraint.msg;
+                return false;
+              }
+            });
+          }
 
           return new sequelizeErrors.UniqueConstraintError({
             message: message,