How to change column data type in laravel 5.6?

Question

I am trying to change column data type using laravel 5.6.

I have a table in which two columns have a data type of text but I would like to change it to longtext. I have tried following:

• executed composer require doctrine/dbal
• executed composer dump-autoload

...and then created the migration 2019_12_23_065820_change_response_column_data_type_in_log_requests_table.php for log_requests table.

...and then the following script

public function up()
{
    Schema::table('log_requests', function (Blueprint $table) {
        $table->longText('request')->nullable()->change();
        $table->longText('response')->nullable()->change();
    });
}

But it is not changing the column's data type. Can someone guide me? Where am I wrong so that I can fix it? Thank you.

EDITED

After requesting for migration in comment, I added migration script:

public function up()
{
    Schema::create('log_requests', function (Blueprint $table) {
        $table->increments('id');
        $table->bigInteger('user_id')->nullable()->unsigned();
        $table->string('api_name')->nullable();
        $table->string('url')->nullable();
        $table->string('method')->nullable();
        $table->string('ip_address')->nullable();
        $table->string('status_code')->nullable();
        $table->string('duration')->nullable();
        $table->text('request')->nullable();
        $table->text('response')->nullable();
        $table->timestamps();
    });
}

Answer 1

Just change the column comment, for example:

$table->mediumText('myColumn')->comment(' ')->change(); // up
$table->text('myColumn')->comment('')->change(); // down