Souke/console/migrations/m170517_073105_add_champs_prix_libre_user.php

<?php

use yii\db\Migration;
use yii\db\Schema;

class m170517_073105_add_champs_prix_libre_user extends Migration
{
    public function up()
    {
        $this->addColumn('user', 'prix_libre', Schema::TYPE_FLOAT.' DEFAULT NULL') ;
    }

    public function down()
    {
        $this->dropColumn('user', 'prix_libre') ;
    }   
}