all tests solved

app/Http/Controllers/CountryController.php

@@ -9,7 +9,7 @@ class CountryController extends Controller
     public function index()
     {
         // TASK: load the relationship average of team size
-        $countries = Country::all();
+        $countries = Country::withAvg('teams', 'size')->get();
 
         return view('countries.index', compact('countries'));
     }

app/Http/Controllers/ProjectController.php

@@ -2,14 +2,18 @@
 
 namespace App\Http\Controllers;
 
+use App\Models\Project;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
 
 class ProjectController extends Controller
 {
     public function store(Request $request)
     {
-        // TASK: Add one sentence to save the project to the logged-in user
-        //   by $request->project_id and with $request->start_date parameter
+
+        Auth::user()->projects()
+            ->attach(Project::find($request->project_id), ['start_date'=>$request->start_date]);
+
 
         return 'Success';
     }

app/Http/Controllers/UserController.php

@@ -8,7 +8,7 @@ class UserController extends Controller
 {
     public function index()
     {
-        $users = User::all();
+        $users = User::has('projects')->get();
 
         return view('users.index', compact('users'));
     }

app/Models/Attachment.php

@@ -4,15 +4,16 @@
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
 
 class Attachment extends Model
 {
     use HasFactory;
 
     protected $fillable = ['filename', 'attachable_id', 'attachable_type'];
 
-    public function attachable()
+    public function attachable(): MorphTo
     {
-        // TASK: fill in the code to make it work
+        return $this->morphTo();
     }
 }

app/Models/Role.php

@@ -14,6 +14,6 @@ class Role extends Model
     public function users()
     {
         // TASK: fix this by adding a parameter
-        return $this->belongsToMany(User::class);
+        return $this->belongsToMany(User::class, 'users_roles');
     }
 }

app/Models/Task.php

@@ -13,6 +13,6 @@ class Task extends Model
 
     public function user()
     {
-        return $this->belongsTo(User::class, 'users_id');
+        return $this->belongsTo(User::class, 'users_id', 'id')->withDefault();
     }
 }

app/Models/Team.php

@@ -14,7 +14,7 @@ class Team extends Model
     public function users()
     {
         // TASK: fix this by adding some extra code
-        return $this->belongsToMany(User::class);
+        return $this->belongsToMany(User::class)->withPivot(['position', 'created_at']);
     }
 
 }

app/Models/User.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Contracts\Auth\MustVerifyEmail;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\HasManyThrough;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
@@ -45,12 +46,12 @@ class User extends Authenticatable
     public function tasks()
     {
         // TASK: fix this by adding a parameter
-        return $this->hasMany(Task::class);
+        return $this->hasMany(Task::class, 'users_id');
     }
 
-    public function comments()
+    public function comments(): HasManyThrough
     {
-        // TASK: add the code here for two-level relationship
+        return $this->hasManyThrough(Comment::class, Task::class, 'users_id');
     }
 
     public function projects()