php_laravel_laracasts/app/Task.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Task extends Model
{
    /**
     * Returns a collection, so cannot be chained.
     *
     * @return \Illuminate\Database\Eloquent\Collection|static[]
     */
    public static function incomplete_v0()
    {
        return static::where('completed', 0)->get();
    }

    /**
     * Will answer to Task::incomplete() too but know it is a query scope.
     *
     * @param $query
     *   The existing query.
     *
     * @return mixed
     */
    public function scopeIncomplete($query)
    {
        return $query->where('completed', 0);
    }
}