(Laravel) Polymorphic relation through pivot table - laravel

Question

Let's say, I have an Event model, which has more participants of various models (Player, Coach, Admin) through polymorphic relation and a pivot table (EventParticipant), which also contains a boolean column participate. I want to get participants through $event->participants which retrieves a collection of players, coaches, and admins through a polymorphic relation.
I have something similar created with standard non-polymorphic relation in trainings, like this:
class Training extends Model
{
/**
* Training has more players.
*/
public function players() {
return $this->belongsToMany('App\Player', 'training_player')
->using('App\TrainingPlayer')
->withPivot('participate');
}
}
class TrainingPlayer extends Pivot
{
/**
* The attributes that should be cast to native types.
*
* #var array
*/
protected $casts = [
'participate' => 'boolean'
];
}
How could this be modified in the case of events, where participants() can be either Player, Coach, or Admin model? (Maybe something with MorphPivot class but I can't imagine how.)
(Instead of player_id (in TrainingPlayer class) which refers to id of the Player model, there are two columns role and rollable_id (in EventParticipant class) which refers to id of the Player, Coach, or Admin model, respectively)
class Event extends Model
{
/**
* Event has more participants (players, coaches, or admins).
*/
public function participants() {
//
}
}
class EventParticipant extends MorphPivot
{
//
}
Any help would be appreciate. :) Thx

Answer 1

I have been looking for something similar and came up with a solution. As per Jonas comment, you can't have different Models in 1 related set but you can have 1 for each model using 1 pivot table.
You can now query this with \App\Team::find(1)->with(['managers', 'users'])->get();
Schema::create('associations', function (Blueprint $table) {
$table->id();
$table->string('association_type');
$table->integer('association_id');
$table->integer('team_id');
$table->integer('meta')->nullable();
$table->timestamps();
});
Schema::create('managers', function (Blueprint $table) {
$table->id();
$table->timestamps();
});
Schema::create('users', function (Blueprint $table) {
$table->id();
$table->timestamps();
});
Schema::create('teams', function (Blueprint $table) {
$table->id();
$table->timestamps();
});
class Manager extends Model
{
public function teams()
{
return $this->belongsToMany('\App\Team', 'associations')->using('App\Association');
}
}
class Team extends Model
{
public function managers()
{
return $this->morphedByMany('App\Manager', 'association')->using('App\Association');
}
public function users()
{
return $this->morphedByMany('App\User', 'association')->using('App\Association');
}
}
class User extends Authenticatable
{
public function teams()
{
return $this->belongsToMany('\App\Team', 'associations')->using('App\Association');
}
}
// App/Association
use Illuminate\Database\Eloquent\Relations\MorphPivot;
class Association extends MorphPivot
{
protected $table = 'associations'; // not sure if this is needed
}