Removed obsolete dir

Numeric conversions for all ids coming in as route req params.
Infrastructure for proper error message when dependencies prevent entity deletion.

lib/helpers.js

@@ -5,7 +5,8 @@ let _ = require('./translate')._;
 module.exports = {
     enforce,
     cleanupFromPost,
-    filterObject
+    filterObject,
+    castToInteger
 };
 
 function enforce(condition, message) {
@@ -27,4 +28,14 @@ function filterObject(obj, allowedKeys) {
     }
 
     return result;
+}
+
+function castToInteger(id) {
+    const val = parseInt(id);
+
+    if (!Number.isInteger(val)) {
+        throw new Error('Invalid id');
+    }
+
+    return val;
 }