Commitment.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\Request;
use Illuminate\Database\Eloquent\Relations\Relation;

Relation::morphMap([
    'event' => 'App\Event',
    'tournament' => 'App\Tournament'
]);

class Commitment extends Model

{

    public function commitable()
    {
        return $this->morphTo();
    }

    public function user()
    {
        return $this->belongsTo(User::class);
    }

}

Event.php

<?php

namespace App;
use App\Sport;
use App\Venue;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Model;

abstract class Event extends Model
{
    protected $guarded = [];

    // First override default Carbon Dates
    protected $dates = ['start_time'];

    // Now, make start_time string Carbon date
    public function setStarttimeAttribute($date)
    {
        $this->attributes['start_time'] = Carbon::parse($date);
    }

    public function user()
    {
      return $this->belongsTo(User::class);
    }

    public function sport()
    {
      return $this->belongsTo(Sport::class);
    }

    public function venue()
    {
      return $this->belongsTo(Venue::class);
    }

    public function comments()
    {
      return $this->morphMany(Comment::class, 'commentable');
    }

    public function commitments()
    {
      return $this->morphMany(Commitment::class, 'commitable');
    }

    // public function commitedPlayers()
    // {
    //     // return $this->commitments()->withCount();
    //     // return $event->commitments()->withCount();
    //     // return $this->commitments()->count();
    //     return $this->commitments()->count();
    // }

}

Tournament.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use App\Event;

class Tournament extends Event
{
    
    // public function commitedPlayers()
    // {
    //     return $this->tournament->commitments()->count();
    // }

}