funkybob / django-closure-tree Goto Github PK
View Code? Open in Web Editor NEWClosure view based Tree models for Django
License: MIT License
Closure view based Tree models for Django
License: MIT License
It's also possible to have a materialised path view that does the same basic thing as this - but is that too much feature creep?
CREATE OR REPLACE RECURSIVE VIEW {view}(node_id, ancestors) AS
SELECT node_id, ARRAY[]::INTEGER[] AS ancestors
FROM {table} WHERE parent_id IS NULL
UNION ALL
SELECT node_id, ancestors || parent_id
FROM {table}
INNER JOIN {view} ON (parent_id = node_id);
It seems this may be useful - in the case of fetching the list of ancestors, it could then be done without building the other view (and then aggregating that, and remembering to include ordering).
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