diff --git a/.travis.yml b/.travis.yml
index 87740706..b9b75fd0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,10 +12,6 @@ node_js:
 script:
   - npm run codecov
 
-cache:
-  directories:
-    - "node_modules"
-
 notifications:
   email:
     on_success: never
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 926531ea..4a6f3a80 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [v0.12.1](https://github.com/ardalanamini/prototyped.js/releases/tag/v0.12.1) *(2018-07-31)*
+
+**Fixed bugs:**
+
+- `Array.prototype.nest`
+  - fixed finding children of children bug
+
 ## [v0.12.0](https://github.com/ardalanamini/prototyped.js/releases/tag/v0.12.0) *(2018-07-26)*
 
 **Implemented enhancements:**
diff --git a/package-lock.json b/package-lock.json
index f432b7c5..5645ff31 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "prototyped.js",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 119a46b0..e1fea19f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prototyped.js",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "description": "Common typescript ready prototypes available in both es5 and es6",
   "author": "Ardalan Amini <ardalanamini22@gmail.com>",
   "license": "MIT",
diff --git a/src/array/nest/index.ts b/src/array/nest/index.ts
index e7e9496c..78daec48 100644
--- a/src/array/nest/index.ts
+++ b/src/array/nest/index.ts
@@ -2,26 +2,26 @@ import * as method from "./method";
 
 declare global {
   interface Array<T> {
-    nest(id?: any, link?: string): object[];
+    nest(link?: string, key?: string): object[];
   }
 }
 
 /**
  * Given a flat array of objects linked to one another, it will nest them recursively
  * @memberof Array
- * @param {*} id
  * @param {string} link
+ * @param {string} id
  * @returns {Object[]}
  * @example
  * const comments = [
- *   { id: 1, parent_id: null },
- *   { id: 2, parent_id: 1 },
- *   { id: 3, parent_id: 1 },
- *   { id: 4, parent_id: 2 },
- *   { id: 5, parent_id: 4 }
+ *   { id: 1, comment_id: null },
+ *   { id: 2, comment_id: 1 },
+ *   { id: 3, comment_id: 1 },
+ *   { id: 4, comment_id: 2 },
+ *   { id: 5, comment_id: 4 }
  * ];
- * comments.nest(); // [{ id: 1, parent_id: null, children: [...] }]
+ * comments.nest("comment_id"); // [{ id: 1, comment_id: null, children: [...] }]
  */
-Array.prototype.nest = function(id, link): any {
-  return method(this, id, link);
+Array.prototype.nest = function(link, key): any {
+  return method(this, link, key);
 };
diff --git a/src/array/nest/method.ts b/src/array/nest/method.ts
index 86d90c28..a2b24053 100644
--- a/src/array/nest/method.ts
+++ b/src/array/nest/method.ts
@@ -1,5 +1,7 @@
-const method = (arr: any[], id: any = null, link: string = "parent_id"): any[] =>
+const filter = (arr: any[], link: string, key: string, id: any = null): any[] =>
   arr.filter((item) => item[link] === id)
-    .map((item) => ({ ...item, children: method(arr, item.id) }));
+    .map((item) => ({ ...item, children: filter(arr, link, key, item[key]) }));
+
+const method = (arr: any[], link: string = "parent_id", key: string = "id"): any[] => filter(arr, link, key);
 
 export = method;
diff --git a/src/array/nest/test.ts b/src/array/nest/test.ts
index 00b67bb6..5412b3f1 100644
--- a/src/array/nest/test.ts
+++ b/src/array/nest/test.ts
@@ -3,29 +3,29 @@ import "./index";
 describe("Array.prototype.nest", () => {
   test("Array.prototype.nest", () => {
     const comments = [
-      { id: 1, parent_id: null },
-      { id: 2, parent_id: 1 },
-      { id: 3, parent_id: 1 },
-      { id: 4, parent_id: 2 },
-      { id: 5, parent_id: 4 },
+      { id: 1, comment_id: null },
+      { id: 2, comment_id: 1 },
+      { id: 3, comment_id: 1 },
+      { id: 4, comment_id: 2 },
+      { id: 5, comment_id: 4 },
     ];
 
-    expect(comments.nest()).toEqual([
+    expect(comments.nest("comment_id")).toEqual([
       {
         id: 1,
-        parent_id: null,
+        comment_id: null,
         children: [
           {
             id: 2,
-            parent_id: 1,
+            comment_id: 1,
             children: [
               {
                 id: 4,
-                parent_id: 2,
+                comment_id: 2,
                 children: [
                   {
                     id: 5,
-                    parent_id: 4,
+                    comment_id: 4,
                     children: [],
                   },
                 ],
@@ -34,7 +34,7 @@ describe("Array.prototype.nest", () => {
           },
           {
             id: 3,
-            parent_id: 1,
+            comment_id: 1,
             children: [],
           },
         ],