Hello

how can i have a requires=XXX to filter data on the referenced table based
on the field entities selected by the user?

db.define_table(
    'usersubentities',
    Field('auth_user', db.auth_user),
    Field('entities' ,   "list:reference
db.dbentities",requires=IS_IN_DB(db, 'dbentities.id', '%(entity)s',
multiple=True),label="Entities"),
    Field('subentities' ,"list:reference
db.entity",requires=XXXXXXX,label="Sub Entities")
)


Regards

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