Set default `$currentOrder` in `Sort` class

[Tigrov]

$currentOrder can be set to default value after normalizing config.

data/src/Reader/Sort.php

Lines 114 to 126 in 15ddd6e

	$normalizedConfig[$fieldName] = array_merge(
	[
	'asc' => [$fieldName => SORT_ASC],
	'desc' => [$fieldName => SORT_DESC],
	'default' => 'asc',
	],
	$fieldConfig,
	);
	}
	/** @psalm-var TConfig $normalizedConfig */
	$this->config = $normalizedConfig;
	}

This will help avoid an exception if $currentOrder is not set manually.

data/src/Paginator/KeysetPaginator.php

Lines 444 to 446 in 15ddd6e

	if (empty($sort->getOrder())) {
	throw new InvalidArgumentException('Data should be always sorted to work with keyset pagination.');
	}

[vjik]

How to understand which order is default?

[Tigrov]

Usually it's in ascending order.

[vjik]

Order in Sort object is field name + order direction, e. g. "id asc". Configuration may contains a lot of fields, how we can understand which field should use by default?

[Tigrov]

By default sort by all fields in ascending order

[vjik]

For set default order we should select field also, not only direction. How we can understand which field should use by default?

For example, configuration: ['id' => ..., 'name' => ..., 'create_date' => ...]. Order may be id asc or create_date asc or name asc ...

[Tigrov]

If we use KeysetPaginator, then sorting is required. In case $currentOrder is not set, we can use the first field from the configuration. If multiple fields are required for sorting, the user must initialize $currentOrder.

[samdark]

Makes sense.