Cascade deletion (composite relation)

[bcogrel]

In Cubic Web, this information is given by the attribute "composite" of a RelationDefinition : http://docs.cubicweb.org/tutorials/base/customizing-the-application.html?highlight=delete#defining-our-model

For instance:

class community_blog(RelationDefinition):
    subject = 'Community'
    object = 'Blog'
    cardinality = '*?'
    composite = 'subject'

When a community (subject) is deleted, its blogs also are.