Undefined variable: currentUser - laravel

Question

I was following the laracasts video for creating follow option but on clicking on the username it is showing the above error and I don't know where to define this variable. Followscontroller
<?php
namespace App\Http\Controllers;
use Redirect;
use App\User;
use Laracasts\Commander\CommanderTrait;
use App\FollowUserCommand;
use Sentinel;
use Illuminate\Support\Facades\Input;
use App\Http\Requests;
use App\Http\Controllers\Controller;
class FollowsController extends Controller
{
use CommanderTrait;
/**
* Follow a User
*
* #param \Illuminate\Http\Request $request
* #return \Illuminate\Http\Response
*/
public function store()
{
$input = array_add(Input::all(), 'user_id', Sentinel::getuser()->id);
$this->execute(FollowUserCommand::class, $input);
return Redirect::back();
}
/**
* Unfollow a User
*
* #param int $id
* #return \Illuminate\Http\Response
*/
public function destroy($id)
{
//
}
}
FollowUserCommand
<?php namespace App;
use App\User;
class FollowUserCommand {
public $user_id;
public $userIdToFollow;
function __construct($user_id, $userIdToFollow)
{
$this->user_id = $user_id;
$this->userIdToFollow = $userIdToFollow;
}
}
FollowUserCommandHandler
<?php namespace App;
use Laracasts\Commander\CommandHandler;
class FollowUserCommandHandler implements CommandHandler {
protected $userRepo;
function __construct(UserRepository $userRepo)
{
$this->userRepo = $userRepo;
}
public function handle($command)
{
$user = $this->userRepo->findById($command->user_id);
$this->userRepo->follow($command->userIdToFollow, $user);
return $user;
}
}
UserRepository
<?php namespace App;
use App\User;
class UserRepository {
public function save(User $user)
{
return $user->save();
}
public function getPaginated($howMany = 4)
{
return User::orderBy('first_name', 'asc')->paginate($howMany);
}
public function findByUsername($username)
{
return User::with(['feeds' => function($query)
{
$query->latest();
}
])->whereUsername($username)->first();
}
public function findById($id)
{
return User::findOrFail($id);
}
public function follow($userIdToFollow, User $user)
{
return $user->follows()->attach($userIdToFollow);
}
}
User.php
<?php namespace App;
use Cartalyst\Sentinel\Users\EloquentUser;
use Illuminate\Database\Eloquent\SoftDeletes;
class User extends EloquentUser {
/**
* The database table used by the model.
*
* #var string
*/
protected $table = 'users';
/**
* The attributes to be fillable from the model.
*
* A dirty hack to allow fields to be fillable by calling empty fillable array
*
* #var array
*/
protected $fillable = [];
protected $guarded = ['id'];
/**
* The attributes excluded from the model's JSON form.
*
* #var array
*/
protected $hidden = ['password', 'remember_token'];
/**
* To allow soft deletes
*/
use SoftDeletes;
protected $dates = ['deleted_at'];
public function feeds()
{
return $this->hasMany('App\Feed');
}
public function comment()
{
return $this->hasMany('App\Comment');
}
// This function allows us to get a list of users following us
public function follows()
{
return $this->belongsToMany(self::class, 'follows', 'follower_id', 'followed_id')->withTimestamps();
}
// Get all users we are following
public function following()
{
return $this->belongsToMany('User', 'followers', 'user_id', 'follow_id')->withTimestamps();
}
// if current user follows another user
public function isFollowedBy(User $otherUser)
{
$idsWhoOtherUserFollows = $otherUser->follows()->lists('followed_id');
return in_array($this->id, $idsWhoOtherUserFollows) ;
}
}
form.blade.php
#if($user->isFollowedBy($currentUser))
<p>You are following {{ $user->username }}<p>
#else
{!! Form::open(['route' => 'follows_path']) !!}
{!! Form::hidden('userIdToFollow', $user->id) !!}
<button type="submit" class="btn btn-primary">Follow {{ $user->username }} </button>
{!! Form::close() !!}
#endif

Answer 1

Assuming the tutorial implements the Auth class, you can get the current user by changing #if($user->isFollowedBy($currentUser)) to #if($user->isFollowedBy(\Illuminate\Support\Facades\Auth::user())). It is otherwise very difficult to read through your code, but kudos to you for trying to be thorough.
You obviously don't want to use Auth::user() in this way. Trying using it as Auth::user() without the full namespace, but otherwise add the namespace as use Illuminate\Support\Facades\Auth; in the controller handling that view.