Factory model story with model states

HasModelStates.php

<?php

trait HasModelStates
{
    /**
     * The registered model states.
     *
     * @var array
     */
    protected $states = [];

    /**
     * Add some model states to pass down to the model factory.
     *
     * @param array|string $states
     * @return $this
     */
    public function states($states)
    {
        $this->states = array_merge($this->states, array_wrap($states));

        return $this;
    }
}