{"result":{"depiction_url":null,"edges":{"references":{"objects":[{"created":"2020-05-30T05:48:14Z","object_id":{"id":1274,"is_a":["text","documentation","developerguide"],"name":"doc_developerguide_notifications","title":"Notifications","uri":"https:\/\/zotonic.com\/id\/1274"},"seq":1000000}],"predicate":{"id":332,"is_a":["meta","predicate"],"name":"references","title":{"_type":"trans","tr":{"en":"References"}},"uri":"https:\/\/zotonic.com\/id\/references"}},"subject":{"objects":[{"created":"2026-09-09T13:47:33Z","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":"2026-09-09T13:47:33Z","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":"2026-09-09T13:47:33Z","object_id":{"id":2567,"is_a":["categorization","keyword","keyword_domain"],"name":"zotonic_topic_content_management","title":"Content management","uri":"https:\/\/zotonic.com\/id\/2567"},"seq":3},{"created":"2026-09-09T13:47:33Z","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":"2026-09-09T13:47:33Z","object_id":{"id":2627,"is_a":["categorization","keyword","keyword_architecture"],"name":"zotonic_topic_notification","title":"Notification","uri":"https:\/\/zotonic.com\/id\/2627"},"seq":5},{"created":"2026-09-09T13:47:33Z","object_id":{"id":2638,"is_a":["categorization","keyword","keyword_task"],"name":"zotonic_topic_edit","title":"Edit","uri":"https:\/\/zotonic.com\/id\/2638"},"seq":6}],"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":2052,"is_a":["text","documentation","reference","notification"],"links":[{"rel":"self","target":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2052"},{"rel":"hub","target":"https:\/\/zotonic.com\/.zotonic\/websub"}],"medium":null,"medium_url":null,"name":"doc_notification_rsc_update","page_url":{"en":"https:\/\/zotonic.com\/docs\/2052\/observe_rsc_update-3","x-default":"https:\/\/zotonic.com\/docs\/2052\/observe_rsc_update-3"},"preview_url":null,"resource":{"version":3323,"pivot_location_lat":null,"title":"observe_rsc_update\/3","is_authoritative":true,"body":"<p>An updated resource is about to be persisted. Observe this notification to change the resource properties before they\nare persisted.<\/p>\n<p>The props are the resource’s props <em>before<\/em> the update, but <em>after<\/em> filtering and sanitization. The folded\nvalue is <code>{ok, UpdateProps}<\/code> for the update itself.<\/p>\n<p>Type:<\/p>\n<p><a href=\"\/id\/doc_developerguide_notifications#notification-foldr\">foldr<\/a><\/p>\n<p>Return:<\/p>\n<p><code>{ok, UpdateProps}<\/code> or <code>{error, term()}<\/code><\/p>\n<p><code>#rsc_update{}<\/code> properties:<\/p>\n<ul><li>action: <code>insert|update<\/code><\/li><li>id: <code>m_rsc:resource_id()<\/code><\/li><li>props: <code>m_rsc:props()<\/code><\/li><\/ul>\n<p>An updated resource is about to be persisted. Observe this notification to change the resource properties before they\nare persisted.<\/p>\n<h2>Arguments<\/h2>\n<p><code>#rsc_update<\/code><\/p>\n<p><code>action<\/code><\/p>\n<p>Either <code>insert<\/code> or <code>update<\/code>.<\/p>\n<p><code>id<\/code><\/p>\n<p>Id of the resource.<\/p>\n<p><code>props<\/code><\/p>\n<p>Map with resource properties.<\/p>\n<p><code>{ok, UpdateProps} | {error, Reason}<\/code><\/p>\n<p>And\/remove resource properties before the update is persisted.<\/p>\n<p><code>Context<\/code><\/p>\n<p>Site context<\/p>\n<h2>Example<\/h2>\n<p>Add a property before the resource is persisted:<\/p>\n<pre class=\"notranslate\"><code class=\"notranslate language-erlang\">observe_rsc_update(#rsc_update{action = insert, id = Id}, {ok, Props}, Context) -&gt;\n    %% Set an extra property\n    {ok, Props#{ &lt;&lt;&quot;extra_property&quot;&gt;&gt; =&gt; &lt;&lt;&quot;special value!&quot;&gt;&gt; }}.\nobserve_rsc_update(#rsc_update{action = insert, id = Id}, {error, _} = Error, Context) -&gt;\n    Error.\n<\/code><\/pre>","slug":"observe_rsc_update-3","is_protected":false,"visible_for":0,"tz":"UTC","language":["en"],"doc_source_hash":"8f1377d0ea07cd739bddf17e6e4c687e0c283c3e1d33ef25c066b803a156ea1c","is_featured":false,"notification":{"arity":3,"callbacks":[{"arity":3,"name":"observe_rsc_update","signature":"observe_rsc_update\/3","variation":"observe"}],"name":"rsc_update","record":{"action":"undefined","id":"undefined","props":"undefined"}},"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":1122,"is_a":["meta","category"],"name":"notification","title":"Notifications","uri":"https:\/\/test.zotonic.com\/id\/1122"},"doc_source_path":"apps\/zotonic_core\/src\/behaviours\/zotonic_observer.erl","publication_start":"2023-01-30T19:24:01Z","github_url":"https:\/\/github.com\/zotonic\/zotonic\/blob\/master\/apps\/zotonic_core\/src\/behaviours\/zotonic_observer.erl","pivot_location_lng":null,"doc_source_kind":"notification","name":"doc_notification_rsc_update","is_unfindable":false,"is_published":true,"pivot_geocode":null,"created":"2020-05-30T05:47:53Z","uri":null,"doc_status":"current","is_dependent":false,"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":"b8c4b2ccdc223257f311968fbd17b2d66f0c4156\n","creator_id":{"id":336,"is_a":["person","robot"],"name":"gitbot","title":"Git","uri":"https:\/\/zotonic.com\/id\/336"},"modified":"2026-09-30T09:39:31Z","title_slug":"observe_rsc_update-3"},"uri":"https:\/\/zotonic.com\/id\/2052","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2052"}},"status":"ok"}