[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3160) Support one-to-many list associations with constraints on both (owner_id, position) and (child_id)

Support one-to-many list associations with constraints on both (owner_id, position) and (child_id) -------------------------------------------------------------------------------------------------- Key: HHH-3160 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3160 Project: Hibernate3 Issue Type: Sub-task Reporter: Gail Badner Assignee: Gail Badner The logic used for removing entities from one-to-many list associations can cause ConstraintViolationException will be thrown if there are constraints on both (owner_id, position) and (child_id) in the "collection table". If the association is on a join table, the "collection table" is the join table; otherwise, the "collection table" is the child entity table.. Currently, SchemaExport does not put a constraint on (owner_id, position) when exporting one-to-many list associations on a foreign key. SchemaExport should be updated to also export this constraint. See HHH-1268 for a description of how to reproduce this issue. For one-to-many list associations on a foreign key, the workaround is to define the unique constraint on (owner_id, position) in the child entity table as deferred. It is assumed that the primary key in the child entity table is the child ID. For a one-to-many list association on a join table, the workaround is to define the constraint on (child_id) in the join table as deferred. It is assumed that the primary key in the join table is (owner_id, position). If your Dialect does not support deferred constraints, then the only workaround is to exclude the unique constraint.