{"result":{"depiction_url":null,"edges":{"in_module":{"objects":[{"created":"2026-09-09T13:48:13Z","object_id":{"id":335,"is_a":["text","documentation","reference","module"],"name":"doc_core","title":"Zotonic Core","uri":"https:\/\/zotonic.com\/id\/335"},"seq":1}],"predicate":{"id":333,"is_a":["meta","predicate"],"name":"in_module","title":{"_type":"trans","tr":{"en":"In module"}},"uri":"https:\/\/zotonic.com\/id\/in_module"}},"subject":{"objects":[{"created":"2026-09-09T13:48:13Z","object_id":{"id":2555,"is_a":["categorization","keyword","keyword_information_type"],"name":"zotonic_topic_reference","title":"Reference","uri":"https:\/\/zotonic.com\/id\/2555"},"seq":1},{"created":"2026-09-09T13:48:13Z","object_id":{"id":2564,"is_a":["categorization","keyword","keyword_audience"],"name":"zotonic_topic_backend_developer","title":"Backend developer","uri":"https:\/\/zotonic.com\/id\/2564"},"seq":2},{"created":"2026-09-09T13:48:13Z","object_id":{"id":2568,"is_a":["categorization","keyword","keyword_domain"],"name":"zotonic_topic_content_modeling","title":"Content modeling","uri":"https:\/\/zotonic.com\/id\/2568"},"seq":3},{"created":"2026-09-09T13:48:13Z","object_id":{"id":2614,"is_a":["categorization","keyword","keyword_architecture"],"name":"zotonic_topic_resource","title":"Resource","uri":"https:\/\/zotonic.com\/id\/2614"},"seq":4},{"created":"2026-09-09T13:48:13Z","object_id":{"id":2625,"is_a":["categorization","keyword","keyword_architecture"],"name":"zotonic_topic_model","title":"Model","uri":"https:\/\/zotonic.com\/id\/2625"},"seq":5},{"created":"2026-09-09T13:48:13Z","object_id":{"id":2643,"is_a":["categorization","keyword","keyword_task"],"name":"zotonic_topic_query","title":"Query","uri":"https:\/\/zotonic.com\/id\/2643"},"seq":6},{"created":"2026-09-09T13:48:13Z","object_id":{"id":2664,"is_a":["categorization","keyword","keyword_data_type"],"name":"zotonic_topic_collection","title":"Collection","uri":"https:\/\/zotonic.com\/id\/2664"},"seq":7}],"predicate":{"id":308,"is_a":["meta","predicate"],"name":"subject","title":{"_type":"trans","tr":{"en":"Keyword"}},"uri":"http:\/\/purl.org\/dc\/elements\/1.1\/subject"}}},"id":2099,"is_a":["text","documentation","reference","model"],"links":[{"rel":"self","target":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2099"},{"rel":"hub","target":"https:\/\/zotonic.com\/.zotonic\/websub"}],"medium":null,"medium_url":null,"name":"doc_model_model_hierarchy","page_url":{"en":"https:\/\/zotonic.com\/docs\/2099\/hierarchy","x-default":"https:\/\/zotonic.com\/docs\/2099\/hierarchy"},"preview_url":null,"resource":{"version":4047,"pivot_location_lat":null,"title":"hierarchy","is_authoritative":true,"body":"

The category hierarchy tables have been replaced by m_hierarchy<\/em>. This model defines named hierarchies of resources (pages).<\/p>\n

If the categories are changed then the system needs to update the pivot_category_nr<\/em> field of all resources. With\nthe introduction of m_hierarchy<\/em> this renumbering is much more efficient and will only affect a minimal number of resources.<\/p>\n

The m_hierarchy<\/em> module is also used for the content- and user group hierarchies, as used by the new\nmod_acl_user_groups<\/em> module.<\/p>\n

Available Model API Paths<\/h2>\n
Method<\/th>Path pattern<\/th>Description<\/th><\/tr><\/thead>
get<\/code><\/td>\/+name\/tree\/...<\/code><\/td>Return full hierarchy tree for hierarchy +name<\/code>.<\/td><\/tr>
get<\/code><\/td>\/+name\/tree1\/...<\/code><\/td>Return first-level hierarchy tree for hierarchy +name<\/code>.<\/td><\/tr>
get<\/code><\/td>\/+name\/tree_flat\/...<\/code><\/td>Return flat tree-ordered list for hierarchy +name<\/code>.<\/td><\/tr>
get<\/code><\/td>\/+name\/menu\/...<\/code><\/td>Return hierarchy +name<\/code> formatted as a menu tree.<\/td><\/tr>
get<\/code><\/td>\/+name\/menu_ensured\/...<\/code><\/td>Return menu hierarchy for +name<\/code>, ensuring required parent nodes exist.<\/td><\/tr>
get<\/code><\/td>\/+name\/+id\/menu_ensured\/...<\/code><\/td>Return menu subtree for hierarchy +name<\/code> rooted at +id<\/code>, ensuring missing parents are created.<\/td><\/tr>
get<\/code><\/td>\/+name\/+id\/menu\/...<\/code><\/td>Return menu subtree for hierarchy +name<\/code> rooted at resource +id<\/code>.<\/td><\/tr>
get<\/code><\/td>\/+name\/+id\/tree\/...<\/code><\/td>Return hierarchy subtree for +name<\/code> rooted at resource +id<\/code>.<\/td><\/tr>
get<\/code><\/td>\/+name\/+id\/tree1\/...<\/code><\/td>Return first-level subtree for hierarchy +name<\/code> rooted at resource +id<\/code>.<\/td><\/tr>
get<\/code><\/td>\/+name\/+id\/tree_flat\/...<\/code><\/td>Return flat tree-ordered list for hierarchy +name<\/code> subtree rooted at resource +id<\/code>.<\/td><\/tr><\/tbody><\/table>\n

\/+name<\/code> marks a variable path segment. A trailing \/...<\/code> means extra path segments are accepted for further lookups.<\/p>","slug":"hierarchy","is_protected":false,"visible_for":0,"tz":"UTC","language":["en"],"doc_source_hash":"688e7a50a549f94fae4029b14f607639a238d2916397d9d91dabec97a66c122f","is_featured":false,"content_group_id":{"id":2551,"is_a":["meta","content_group"],"name":"content_group_imported_docs","title":"Imported documentation","uri":"https:\/\/zotonic.com\/id\/content_group_imported_docs"},"category_id":{"id":322,"is_a":["meta","category"],"name":"model","title":"Models","uri":"https:\/\/test.zotonic.com\/id\/322"},"doc_source_path":"apps\/zotonic_core\/src\/models\/m_hierarchy.erl","publication_start":"2023-06-24T08:17:53Z","github_url":"https:\/\/github.com\/zotonic\/zotonic\/blob\/master\/apps\/zotonic_core\/src\/models\/m_hierarchy.erl","pivot_location_lng":null,"doc_source_kind":"model","name":"doc_model_model_hierarchy","is_unfindable":false,"is_published":true,"pivot_geocode":null,"created":"2020-05-30T05:47:59Z","uri":null,"doc_status":"current","is_dependent":false,"erlang_app":"zotonic_core","publication_end":"9999-06-01T00:00:00Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"privacy":0,"doc_source_commit":"28493fb676b2d92727e68d4fba20d89c56cf8ead\n","erlang_module":"m_hierarchy","creator_id":{"id":336,"is_a":["person","robot"],"name":"gitbot","title":"Git","uri":"https:\/\/zotonic.com\/id\/336"},"modified":"2026-10-15T20:07:39Z","title_slug":"hierarchy"},"uri":"https:\/\/zotonic.com\/id\/2099","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2099"}},"status":"ok"}