How to define cascade delete in the Hybris items.xml? - cascade

Question

I want to remove child objects automatically on removable of the Parent object.
For instance, I have types Car and Engine. The car has an attribute Engine. When Car object is removed, Engine object that is bound to this Car should be removed automatically.
Thanks in advance, guys

Answer 1

Use the "partOf" modifier:
<itemtype code="Car" ...>
...
<attributes>
...
<attribute qualifier="engine" type="Engine">
<persistence type="property" />
<modifiers partof="true" />
</attribute>
</attributes>
</itemtype>
Can also be used with relations:
<relation code="CarToEngineRelation"...>
<sourceElement type="Car" ...>
</sourceElement>
<targetElement type="Engine" ...>
<modifiers partof="true"/>
</targetElement>
</relation>

Answer 2

#Johannes very well set the example.
Let me elaborate more on
What is PartOf?
PartOf modifier is used to define the aggregation relationship between Parent and Child objects. To explain it better I would say PartOf is used to defining cascade delete. When we delete Parent object then all its child objects(partOf) will be deleted automatically.
You can define it at attribute or relation with help of modifiers tag. Like
<itemtype code="User"
extends="Principal"
jaloclass="de.hybris.platform.jalo.user.User"
autocreate="true"
generate="true">
<deployment table="Users" typecode="4" propertytable="UserProps"/>
<attributes>
...
...
<attribute autocreate="true" qualifier="addresses" type="AddressCollection">
<modifiers partof="true"/>
</attribute>
<attribute autocreate="true" qualifier="carts" type="CartCollection">
<modifiers partof="true"/>
</attribute>
</attributes>
</itemtype>
If we remove a user, its all addresses & carts will be removed.
find the detailed post here