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add migration down query to preserve datas

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Mathieu Jaumotte 2021-03-27 11:30:50 +01:00
parent f6801c0c4f
commit dcc6969310
1 changed files with 41 additions and 5 deletions
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46
src/Bundle/ChillPersonBundle/migrations/Version20210326113045.php
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@ -22,6 +22,13 @@ final class Version20210326113045 extends AbstractMigration
return 'Change model relation between Person and AccompagnyingPeriod, without losing datas when going up';
}
/**
* === UP ===>
*
* Preup and postup functions backup datas and transform them
* before injecting them in the new many-to-many join table.
* In these direction, there is no loss.
*/
public function preUp(Schema $schema) : void
{
// extract datas
@ -59,18 +66,47 @@ final class Version20210326113045 extends AbstractMigration
}
/**
* <=== DOWN ===
*
* In predown and postdown we backup datas from jointable, and transform them
* before injecting them back in the many-to-one column 'person_id'.
*
* The distinct clause makes that for each group of duplicates, it keeps only the first row in the returned result set.
* Then we have only few lost datas. Lost datas: when many persons for one AccompanyingPeriod (keep only first person)
*/
public function preDown(Schema $schema) : void
{
// extract datas
$query = "SELECT DISTINCT ON (accompanyingperiod_id) accompanyingperiod_id AS id, person_id FROM persons_accompanying_periods ORDER BY id, person_id ASC";
$data = $this->connection->prepare($query);
$data->execute();
foreach ($data as $row)
{
$id = $row['id'];
$personId = $row['person_id'];
$this->datas[$id] = "$personId";
}
}
public function down(Schema $schema) : void
{
// drop join table
//$this->addSql('DROP TABLE persons_accompanying_periods');
// INFO this dangerous query is commented, then if you go down you must manually :
// * insert datas in TABLE chill_person_accompanying_period COLUMN person_id ;
// * drop join TABLE persons_accompanying_periods when you are sure it works
$this->addSql('DROP TABLE persons_accompanying_periods');
// add column
$this->addSql('ALTER TABLE chill_person_accompanying_period ADD person_id INT DEFAULT NULL');
$this->addSql('ALTER TABLE chill_person_accompanying_period ADD CONSTRAINT fk_64a4a621217bbb47 FOREIGN KEY (person_id) REFERENCES chill_person_person (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
$this->addSql('CREATE INDEX idx_64a4a621217bbb47 ON chill_person_accompanying_period (person_id)');
}
public function postDown(Schema $schema) : void
{
// insert datas in existing table
foreach ($this->datas as $id => $personId) {
$SQL = "UPDATE chill_person_accompanying_period SET person_id='$personId' WHERE id='$id'";
$this->connection->executeQuery($SQL); // CHECK if we have to execute query out of foreach loop. how ?
}
}
}