Flarum\Core\Discussion::stateFor PHP Method

    public function stateFor(User $user)
    {
        $state = $this->state($user)->first();
        if (!$state) {
            $state = new DiscussionState();
            $state->discussion_id = $this->id;
            $state->user_id = $user->id;
        }
        return $state;
    }