Laravel 5 image Upload error

Where is the code that calls savePost?

You might be thinking that Laravel will automagically inject the Request into your savePost method, but I'm pretty sure it does not do that for you.

@ChristopherRaymond Thank you for answer Routes.php

Route::resource('blog', 'BlogController');

BlogController.php

<?php namespace App\Http\Controllers;

use Illuminate\Contracts\Auth\Guard;
use Illuminate\Http\Request;
use App\Http\Requests\PostRequest;
use App\Http\Requests\SearchRequest;
use App\Repositories\BlogRepository;
use App\Repositories\UserRepository;

class BlogController extends Controller {

    /**
     * The BlogRepository instance.
     *
     * @var App\Repositories\BlogRepository
     */
    protected $blog_gestion;

    /**
     * The UserRepository instance.
     *
     * @var App\Repositories\UserRepository
     */
    protected $user_gestion;

    /**
     * The pagination number.
     *
     * @var int
     */
    protected $nbrPages;

    /**
     * Create a new BlogController instance.
     *
     * @param  App\Repositories\BlogRepository $blog_gestion
     * @param  App\Repositories\UserRepository $user_gestion
     * @return void
    */
    public function __construct(
        BlogRepository $blog_gestion,
        UserRepository $user_gestion)
    {
        $this->user_gestion = $user_gestion;
        $this->blog_gestion = $blog_gestion;
        $this->nbrPages = 6;

        $this->middleware('redac', ['except' => ['indexFront', 'show', 'tag', 'search']]);
        $this->middleware('admin', ['only' => 'updateSeen']);
        $this->middleware('ajax', ['only' => ['updateSeen', 'updateActive']]);
    }   

    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function indexFront()
    {
        $posts = $this->blog_gestion->indexFront($this->nbrPages);
        $links = $posts->render();

        return view('front.blog.index', compact('posts', 'links'));
    }

    /**
     * Display a listing of the resource.
     *
     * @return Redirection
     */
    public function index()
    {
        return redirect(route('blog.order', [
            'name' => 'posts.created_at',
            'sens' => 'asc'
        ]));
    }

    /**
     * Display a listing of the resource.
     *
     * @param  Illuminate\Http\Request $request
     * @return Response
     */
    public function indexOrder(Request $request)
    {
        $statut = $this->user_gestion->getStatut();
        $posts = $this->blog_gestion->index(
            10, 
            $statut == 'admin' ? null : $request->user()->id,
            $request->name,
            $request->sens
        );
        
        $links = $posts->appends([
                'name' => $request->name, 
                'sens' => $request->sens
            ]);

        if($request->ajax()) {
            return response()->json([
                'view' => view('back.blog.table', compact('statut', 'posts'))->render(), 
                'links' => e($links->setPath('order')->render())
            ]);     
        }

        $links->setPath('')->render();

        $order = (object)[
            'name' => $request->name, 
            'sens' => 'sort-' . $request->sens          
        ];

        return view('back.blog.index', compact('posts', 'links', 'order'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return Response
     */
    public function create()
    {
        $url = config('medias.url');
        
        return view('back.blog.create')->with(compact('url'));
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  App\Http\Requests\PostRequest $request
     * @return Response
     */
    public function store(PostRequest $request)
    {
        $this->blog_gestion->store($request->all(), $request->user()->id);

        return redirect('blog')->with('ok', trans('back/blog.stored'));
    }

    /**
     * Display the specified resource.
     *
     * @param  Illuminate\Contracts\Auth\Guard $auth     
     * @param  string $slug
     * @return Response
     */
    public function show(
        Guard $auth, 
        $slug)
    {
        $user = $auth->user();

        return view('front.blog.show',  array_merge($this->blog_gestion->show($slug), compact('user')));
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  App\Repositories\UserRepository $user_gestion
     * @param  int  $id
     * @return Response
     */
    public function edit(
        UserRepository $user_gestion, 
        $id)
    {
        $post = $this->blog_gestion->getByIdWithTags($id);

        $this->authorize('change', $post);

        $url = config('medias.url');

        return view('back.blog.edit',  array_merge($this->blog_gestion->edit($post), compact('url')));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  App\Http\Requests\PostUpdateRequest $request
     * @param  int  $id
     * @return Response
     */
    public function update(
        PostRequest $request,
        $id)
    {
        $post = $this->blog_gestion->getById($id);

        $this->authorize('change', $post);

        $this->blog_gestion->update($request->all(), $post);

        return redirect('blog')->with('ok', trans('back/blog.updated'));        
    }

    /**
     * Update "vu" for the specified resource in storage.
     *
     * @param  Illuminate\Http\Request $request
     * @param  int  $id
     * @return Response
     */
    public function updateSeen(
        Request $request, 
        $id)
    {
        $this->blog_gestion->updateSeen($request->all(), $id);

        return response()->json();
    }

    /**
     * Update "active" for the specified resource in storage.
     *
     * @param  Illuminate\Http\Request $request
     * @param  int  $id
     * @return Response
     */
    public function updateActive(
        Request $request, 
        $id)
    {
        $post = $this->blog_gestion->getById($id);

        $this->authorize('change', $post);
        
        $this->blog_gestion->updateActive($request->all(), $id);

        return response()->json();
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function destroy($id)
    {
        $post = $this->blog_gestion->getById($id);

        $this->authorize('change', $post);

        $this->blog_gestion->destroy($post);

        return redirect('blog')->with('ok', trans('back/blog.destroyed'));      
    }

    /**
     * Get tagged posts
     * 
     * @param  Illuminate\Http\Request $request
     * @return Response
     */
    public function tag(Request $request)
    {
        $tag = $request->input('tag');
        $posts = $this->blog_gestion->indexTag($this->nbrPages, $tag);
        $links = $posts->appends(compact('tag'))->render();
        $info = trans('front/blog.info-tag') . '<strong>' . $this->blog_gestion->getTagById($tag) . '</strong>';
        
        return view('front.blog.index', compact('posts', 'links', 'info'));
    }

    /**
     * Find search in blog
     *
     * @param  App\Http\Requests\SearchRequest $request
     * @return Response
     */
    public function search(SearchRequest $request)
    {
        $search = $request->input('search');
        $posts = $this->blog_gestion->search($this->nbrPages, $search);
        $links = $posts->appends(compact('search'))->render();
        $info = trans('front/blog.info-search') . '<strong>' . $search . '</strong>';
        
        return view('front.blog.index', compact('posts', 'links', 'info'));
    }

}

I still do not see the code that calls savePost