gistfile1.diff

diff --git a/lib/ringo/storage/sql/mapping.js b/lib/ringo/storage/sql/mapping.js
index 21399db..3a3bccb 100644
--- a/lib/ringo/storage/sql/mapping.js
+++ b/lib/ringo/storage/sql/mapping.js
@@ -73,6 +73,9 @@ var Mapping = function(type, definition) {
     for (var propName in definition.properties) {
         var propDefinition = definition.properties[propName];
         var propMapping = null;
+        if (typeof propDefinition === "string") {
+            propDefinition = {"type": propDefinition};
+        }
         if (propDefinition.type === "object") {
             propMapping = new ObjectMapping(this, propName, propDefinition);
         } else if (propDefinition.type === "collection") {