Laravel relation from a pivot - php

Question

I have a relation that I cant figure out my current application looks like this
Models
User.php
public function teams()
{
return $this->belongsToMany(Team::class);
}
Team.php
public function tournaments()
{
return $this->belongsToMany(Tournament::class);
}
Tournament.php
public function teams()
{
return $this->belongsToMany(Team::class);
}
Tables
tournaments
id
teams
id
team_tournament
tournament_id
team_id
Now a tournament can have just some of the users participate in the tournament so I've created the below
team_tournament_users
tournament_id
team_id
user_id
To store users that are participating in a tournament from the team.
How should this look in terms of eloquent relations?

Answer 1

So taking your team_tournament_users, I would do the following
Would use the naming convention participants of tournament, so table name would be participants instead of team_tournament_users
Migration
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateParticipantsTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('participants', function (Blueprint $table) {
$table->foreignId('tournament_id')->constrained();
$table->foreignId('user_id')->constrained();
$table->foreignId('team_id')->constrained();
$table->timestamps();
$table->primary(['tournament_id', 'user_id']);
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('participants');
}
}
Relationships: Then would define the following relationships in models
class User extends Model
{
public function teams()
{
return $this->belongsToMany(Team::class);
}
public function tournaments()
{
return $this->belongsToMany(Tournament::class, 'participants')
->withPivot('team_id')
->withTimestamps();
}
}
class Tournament extends Model
{
public function teams()
{
return $this->belongsToMany(Team::class);
}
public function participants()
{
return $this->belongsToMany(User::class, 'participants')
->withPivot('team_id')
->withTimestamps();
}
}
class Team extends Model
{
public function users()
{
return $this->belongsToMany(User::class)->withTimestamps();
}
public function tournaments()
{
return $this->belongsToMany(Tournament::class)->withTimestamps();
}
}
How would I then go about retrieving all the users participating in the team for a specific tournament? So if 3 users/members from a team are selected for the tournament how can I easily find out which members from that team are selected?
//There's already a relation between Tournament and Team(s)
//So we can use it to get the tournament participants from the team
$t = Tournament::with('participants')->first()
->participants
->groupBy(function($participant){
return $participant->pivot->team_id;
});
//If Team with an id of 5 has members participating in the tournament
//Then we can get the members of Team as
$team = Team::findOrFail(5);
$t->get($team->id);