protected function migrateTeachers()
    {
        $this->output->info('### Migrating teachers ###');
        foreach ($this->teachers() as $teacher) {
            $this->showMigratingInfo($teacher, 1);
            $this->output->info('  email: ' . $teacher->email);
            $this->migrateTeacher($teacher);
        }
        $this->output->info(
            '### END Migrating teachers. Migrated ' . count($this->teachers()) .  ' teachers   ###');
    }