Laravel 4 CSV seeder class

CsvSeeder.php

<?php
/**
 * CSV file seeder. put the csv in the same dir named like table_name.csv. Then
 * set the tableName property. The run command picks up from there.
 *
 * @copyright MIT
 */

namespace InternetBrands\AutoClassifiedsPlatform\Common\Seeds;

use DB;
use Goodby\CSV\Import\Standard\Lexer;
use Goodby\CSV\Import\Standard\Interpreter;
use Goodby\CSV\Import\Standard\LexerConfig;
use ReflectionClass;
use Seeder;

/**
 * CsvSeeder
 *
 * @author Michael Funk <mike@mikefunk.com>
 */
class CsvSeeder extends Seeder
{

    /**
     * table name
     *
     * @var string
     */
    protected $tableName;

    /**
     * table field names
     *
     * @var array
     */
    protected $fieldNames;

    /**
     * get the directory to the child class
     *
     * @return string
     */
    protected function getDir()
    {
        $rc = new ReflectionClass(get_class($this));
        return dirname($rc->getFileName());
    }

    /**
     * run seeder
     *
     * @return void
     */
    public function run()
    {

        // use the csv importer to insert data row by row
        $lexer = new Lexer(new LexerConfig());
        $interpreter = new Interpreter();
        $i = 0;
        $interpreter->addObserver(
            function (array $row) use (&$i) {

                // get the field names if it's the first row
                if ($i === 0) {
                    $this->fieldNames = $row;
                } else {

                    // assemble the new array with the field names as keys
                    $rowWithKeys = [];
                    foreach ($this->fieldNames as $key => $fieldName) {
                        $rowWithKeys[$fieldName] = $row[$key];
                    }

                    // insert this row
                    DB::table($this->tableName)->insert($rowWithKeys);
                }
                $i++;
            }
        );

        // get the csv file and start the process
        $fileName = $this->getDir() . '/' . $this->tableName . '.csv';
        $lexer->parse($fileName, $interpreter);

        $this->command->info($this->tableName . ' table seeded!');
    }
}