20171021111005_add_subtype_index_to_river_table.php

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<?php

use Phinx\Migration\AbstractMigration;

class AddSubtypeIndexToRiverTable extends AbstractMigration {
    public function change() {

        $table = $this->table('river');

        if (!$table->hasIndexByName('subtype')) {
            $table->addIndex(['subtype'], [
                'name' => "subtype",
                'unique' => false,
            ]);

            $table->save();
        }
    }
}