BadMethodCallException in Builder.php - php

Question

I'm not having much luck tying to get past the following error
BadMethodCallException in Builder.php
Call to undefined method Illuminate\Database\Query\Builder::posts()
The project I'm working on is a simple timeline for a social network.
Although I'm stuck when calling the following route (creating a post)
Route::group(['middleware' => ['web', 'auth']], function () {
Route::get('home', 'TimelineController#index');
Route::post('/posts', 'PostController#create');
});
POST returns the 500 error I specified above. A quick search for the "unimplemented" method posts() returns:
Searching 5094 files for "posts()"
C:\Users\Administrator\Code\instyle\app\User.php:
16 ];
17
18: public function posts()
19 {
20 return $this->hasMany('Instyle\Post');
C:\Users\Administrator\Code\instyle\app\Http\Controllers \PostController.php:
17 ]);
18
19: $createdPost = $request->user()->posts()->create([
20 'body' => $request->body,
21 ]);
Since I'm having trouble pinpointing this error I'll happily elaborate on any file you require.
Thanks!
As stated by Khalid Dabjan I modified the function "create" to include the following line "dd($request->user());"
The result was a 200 response from the server containing a JSON with all the info relevant to the logged in user.
My Post Controller is as follows:
<?php
namespace Instyle\Http\Controllers;
use Illuminate\Http\Request;
use Instyle\Http\Requests;
use Instyle\Http\Controllers\Controller;
use Instyle\Post;
class PostController extends Controller
{
public function create(Request $request, Post $post)
{
$this->validate($request, [
'body' => 'required|max:600',
]);
$createdPost = $request->user()->posts()->create([
'body' => $request->body,
]);
return response()->json($post->with('user')->find($createdPost->id));
}
}

Answer 1

I fixed the error myself thanks to #Khalid Dabjan poking in my code.
I was using the wrong file for my Users model, for some reason I was using two and the one that didn't have the posts() method was being applied.
I have no idea why I was using two User.php files but that is best left aside for another question since the answer to this question is now clear:
I wasn't implementing the fuction posts() on the correct model, that's why I was getting a "function does not exist" error.