Q:

Controller Class Not Found - Lumen

My Controller for my class 'Article' cannot be found.
I am needing to fetch all entries from the article table.
I am able to use the DB:: facade to pull what's in the DB, but when I try using Article::all() I get:
Class 'App\Http\Controllers\Article' not found

in ArticleController.php line 15
at Application->Laravel\Lumen\{closure}()

Line 15 looks like:
$article = Article::all();

This is what I've tried so far, but with no success:

updated .env.example to .env and set up my DB credentials.
in bootstrap/app.php I've uncommented Dotenv::load(__DIR__.'/../');
In bootstrap/app.php I've uncommented $app->withFacades(); $app->withEloquent();
I've tried to use the full route of the controller in routes.php: $app->get('article', 'App\Http\Controllers\ArticleController@index');

My model directory is located under app->Models and has my Article.php model:
<?php

# app/Models/Article.php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Article extends Model
{
    protected $table = 'articles';
    protected $fillable = ['title', 'content'];
}

My Controller is ArticleController.php
<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;

class ArticleController extends Controller{

    public function index(){

        $article = Article::all();

        return response()->json($article);
    }
}

And my routes.php
<?php

$app->get('article', 'ArticleController@index');

I really appreciate any help on this error. I've unfortunately spent the better part of 2 days on this. 
Thanks.

A:

You need to have the proper namespace. Your Article model is in the App\Models namespace so you need to add this to the top of your controller:
use App\Models\Article;

