Changed from transaction to update.

Author: Christopher M. Baker

dock

@@ -244,26 +244,17 @@ var createAttachmentResource = function(attachment, key, initialValue, onChange,
    } else if (onChange === undefined) {
       callback(new UndefinedPropertyError('onChange'));
    } else {
-      attachment.transaction(function(currentdata) {
-         if(currentdata == null) {
-            return{key: initialValue};
-         } else {
-            currentdata[key] = initialValue;
-            return currentdata;
-         }
+      var data = { };
+      data[key] = initialValue;
 
-      }, function(error, committed, snap) {
-         if (error) {
-            console.log("Resource creation transaction failed for resource " + key);
-         } else if (!committed) {
-            console.log("Looks like we aborted the creation transaction for resource " + key);
-         } else {
-            if (onChange) {
-               attachment.child(key).on("value", onChange);
-            }
-            callback(null, attachment);
-         }
+      attachment.update(data, function(error) {
+        if (error) return callback(error);
+
+        if (onChange) {
+          attachment.child(key).on("value", onChange);
+        }
+
+        callback(null, attachment);
       });
-      return;
    }
 }