How to add cascade argument in XML file format doctrine ORM - symfony

Question

as far as I understand I need to add a "cascade" parameter to the mapping. But my mapping is in XML.
I found quite a bit of information about it but there was no result.
Pleace help!
Мy error is:
Multiple non-persisted new entities were found through the given association graph:\n\n * A new entity was found through the relationship 'Domain\Maintenance\Maintenance#affectedRegions' that was not configured to cascade persist operations for entity: Domain\AffectedRegion\AffectedRegion#0000000075384ba200000000535ab7f1. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example #ManyToOne(..,cascade={"persist"}). If you cannot find out which entity causes the problem implement 'Domain\AffectedRegion\AffectedRegion#__toString()' to get a clue.\n *
XML fails:
<entity name="Domain\Maintenance\Maintenance" table="maintenances" repository-class="Infrastructure\Repositories\MaintenanceRepository">
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<field name="name" type="string"/>
<one-to-many field="affectedRegions" target-entity="Domain\AffectedRegion\AffectedRegion" mapped-by="Domain\Maintenance\Maintenance" />
<cascade>
<cascade-merge/>
</cascade>
</entity>
<entity name="Domain\AffectedRegion\AffectedRegion" table="affected_regions" repository-class="Infrastructure\Repositories\AffectedRegionRepository">
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<many-to-one field="region" target-entity="Domain\Region\Region" inversed-by="Domain\AffectedRegion\AffectedRegion">
<join-column name="region_id" referenced-column-name="id" />
<cascade>
<cascade-persist/>
</cascade>
</many-to-one>
<many-to-one field="maintenance" target-entity="Domain\Maintenance\Maintenance" inversed-by="Domain\AffectedRegion\AffectedRegion">
<join-column name="maintenance_id" referenced-column-name="id" />
<cascade>
<cascade-persist/>
</cascade>
</many-to-one>
<field name="vlans" type="string"/>
<field name="olts" type="string"/>
</entity>
<entity name="Domain\Region\Region" table="regions" repository-class="Infrastructure\Repositories\RegionRepository">
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<field name="name" type="string"/>
<field name="code" type="string"/>
<one-to-many field="affectedRegions" target-entity="Domain\AffectedRegion\AffectedRegion" mapped-by="Domain\Maintenance\Maintenance" />
</entity>
this is my FK:
$affectedRegionTable->addForeignKeyConstraint(
$regionTable,
['region_id'],
['id'],
['onUpdate' => 'CASCADE'],
'fk_affectedRegions_region_id'
);
$affectedRegionTable->addForeignKeyConstraint(
$regionTable,
['maintenance_id'],
['id'],
['onUpdate' => 'CASCADE'],
'fk_affectedRegions_maintenance_id'
);
the relation I want to make is:
Maintenance ← one-to-many → AffectedRegions ← many-to-one → Region

Answer 1

Here is the answer.
Another way to add a cascade argument:
<one-to-many field="affectedRegions" target-entity="Domain\AffectedRegion\AffectedRegion" mapped-by="maintenance">
<cascade>
<cascade-persist/>
<cascade-remove/>
</cascade>
</one-to-many>