Fix instances being created with undefined values

Happens when creating instances using object templates with nested
parameters.

Resolves: #294

lib/local-cache.js

@@ -61,6 +61,16 @@ function computeHash() {
   hash = h.digest("hex");
 }
 
+function flattenObject(src, prefix = "", dst = {}) {
+  for (let k of Object.keys(src)) {
+    let v = src[k];
+    if (typeof v === "object" && !Array.isArray(v))
+      flattenObject(v, `${prefix}${k}.`, dst);
+    else
+      dst[`${prefix}${k}`] = v;
+  }
+  return dst;
+}
 
 function refresh(callback) {
   if (!nextRefresh)
@@ -99,12 +109,17 @@ function refresh(callback) {
             return counter = 0;
           }
 
+          objects = objects.map(obj => {
+            // Flatten object
+            obj = flattenObject(obj);
+
             // If no keys are defined, consider all parameters as keys to keep the
             // same behavior from v1.0
-          for (let obj of objects) {
             if (!obj["_keys"] || !obj["_keys"].length)
               obj["_keys"] = Object.keys(obj).filter(k => !k.startsWith("_"));
-          }
+
+            return obj
+          })
 
           res.sort((a, b) => {
             if (a.weight === b.weight)