RailwayTwo/app/Models/ProjectUser.php

<?php

namespace App\Models;

class ProjectUser extends BaseModel
{
    public function projectRole()
    {
        return $this->belongsTo('App\Models\ProjectRole', 'project_role_id');
    }

    public function user()
    {
        return $this->belongsTo('App\Models\User', 'user_id');
    }
}