friendica-github/src/BaseRepository.php
Hypolite Petovan 4427876c05 Implement correct behavior for min_id in boundary pagination
- The previous behavior of since_id systematically showed the most recent results
2020-10-13 00:11:39 -04:00

251 lines
6.5 KiB
PHP

<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica;
use Friendica\Database\Database;
use Friendica\Database\DBA;
use Friendica\Network\HTTPException;
use Psr\Log\LoggerInterface;
/**
* Repositories are Factories linked to one or more database tables.
*
* @see BaseModel
* @see BaseCollection
*/
abstract class BaseRepository extends BaseFactory
{
const LIMIT = 30;
/** @var Database */
protected $dba;
/** @var string */
protected static $table_name;
/** @var BaseModel */
protected static $model_class;
/** @var BaseCollection */
protected static $collection_class;
public function __construct(Database $dba, LoggerInterface $logger)
{
parent::__construct($logger);
$this->dba = $dba;
$this->logger = $logger;
}
/**
* Fetches a single model record. The condition array is expected to contain a unique index (primary or otherwise).
*
* Chainable.
*
* @param array $condition
* @return BaseModel
* @throws HTTPException\NotFoundException
*/
public function selectFirst(array $condition)
{
$data = $this->dba->selectFirst(static::$table_name, [], $condition);
if (!$data) {
throw new HTTPException\NotFoundException(static::class . ' record not found.');
}
return $this->create($data);
}
/**
* Populates a Collection according to the condition.
*
* Chainable.
*
* @param array $condition
* @param array $params
* @return BaseCollection
* @throws \Exception
*/
public function select(array $condition = [], array $params = [])
{
$models = $this->selectModels($condition, $params);
return new static::$collection_class($models);
}
/**
* Populates the collection according to the condition. Retrieves a limited subset of models depending on the boundaries
* and the limit. The total count of rows matching the condition is stored in the collection.
*
* max_id and min_id are susceptible to the query order:
* - min_id alone only reliably works with ASC order
* - max_id alone only reliably works with DESC order
* If the wrong order is detected in either case, we inverse the query order and we reverse the model array after the query
*
* Chainable.
*
* @param array $condition
* @param array $params
* @param int? $min_id Retrieve models with an id no fewer than this, as close to it as possible
* @param int? $max_id Retrieve models with an id no greater than this, as close to it as possible
* @param int $limit
* @return BaseCollection
* @throws \Exception
*/
public function selectByBoundaries(array $condition = [], array $params = [], int $min_id = null, int $max_id = null, int $limit = self::LIMIT)
{
$totalCount = DBA::count(static::$table_name, $condition);
$boundCondition = $condition;
$reverseModels = false;
if (isset($min_id)) {
$boundCondition = DBA::mergeConditions($boundCondition, ['`id` > ?', $min_id]);
if (!isset($max_id) && isset($params['order']['id']) && ($params['order']['id'] === true || $params['order']['id'] === 'DESC')) {
$reverseModels = true;
$params['order']['id'] = 'ASC';
}
}
if (isset($max_id)) {
$boundCondition = DBA::mergeConditions($boundCondition, ['`id` < ?', $max_id]);
if (!isset($min_id) && (!isset($params['order']['id']) || $params['order']['id'] === false || $params['order']['id'] === 'ASC')) {
$reverseModels = true;
$params['order']['id'] = 'DESC';
}
}
$params['limit'] = $limit;
$models = $this->selectModels($boundCondition, $params);
if ($reverseModels) {
$models = array_reverse($models);
}
return new static::$collection_class($models, $totalCount);
}
/**
* This method updates the database row from the model.
*
* @param BaseModel $model
* @return bool
* @throws \Exception
*/
public function update(BaseModel $model)
{
if ($this->dba->update(static::$table_name, $model->toArray(), ['id' => $model->id], $model->getOriginalData())) {
$model->resetOriginalData();
return true;
}
return false;
}
/**
* This method creates a new database row and returns a model if it was successful.
*
* @param array $fields
* @return BaseModel|bool
* @throws \Exception
*/
public function insert(array $fields)
{
$return = $this->dba->insert(static::$table_name, $fields);
if (!$return) {
throw new HTTPException\InternalServerErrorException('Unable to insert new row in table "' . static::$table_name . '"');
}
$fields['id'] = $this->dba->lastInsertId();
$return = $this->create($fields);
return $return;
}
/**
* Deletes the model record from the database.
*
* @param BaseModel $model
* @return bool
* @throws \Exception
*/
public function delete(BaseModel &$model)
{
if ($success = $this->dba->delete(static::$table_name, ['id' => $model->id])) {
$model = null;
}
return $success;
}
/**
* Base instantiation method, can be overriden to add specific dependencies
*
* @param array $data
* @return BaseModel
*/
protected function create(array $data)
{
return new static::$model_class($this->dba, $this->logger, $data);
}
/**
* @param array $condition Query condition
* @param array $params Additional query parameters
* @return BaseModel[]
* @throws \Exception
*/
protected function selectModels(array $condition, array $params = [])
{
$result = $this->dba->select(static::$table_name, [], $condition, $params);
/** @var BaseModel $prototype */
$prototype = null;
$models = [];
while ($record = $this->dba->fetch($result)) {
if ($prototype === null) {
$prototype = $this->create($record);
$models[] = $prototype;
} else {
$models[] = static::$model_class::createFromPrototype($prototype, $record);
}
}
$this->dba->close($result);
return $models;
}
/**
* @param BaseCollection $collection
*/
public function saveCollection(BaseCollection $collection)
{
$collection->map([$this, 'update']);
}
}