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57 lines
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="One canonical “which container lists this item” link, plus an index that serves a listing in display order."><title>MIGRATION_027 in jellytau_lib::storage::schema - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="jellytau_lib" data-themes="" data-resource-suffix="" data-rustdoc-version="1.97.1 (8bab26f4f 2026-07-14)" data-channel="1.97.1" data-search-js="search-fd9372ac.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-fcd733ba.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc constant"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">MIGRATION_027</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../jellytau_lib/index.html">jellytau_<wbr>lib</a><span class="version">0.13.3</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In jellytau_<wbr>lib::<wbr>storage::<wbr>schema</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">jellytau_lib</a>::<wbr><a href="../index.html">storage</a>::<wbr><a href="index.html">schema</a></div><h1>Constant <span class="constant">MIGRATION_<wbr>027</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/jellytau_lib/storage/schema.rs.html#974-1005">Source</a> </span></div><pre class="rust item-decl"><code>const MIGRATION_027: &<a class="primitive" href="https://doc.rust-lang.org/1.97.1/std/primitive.str.html">str</a> = r#"
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ALTER TABLE items ADD COLUMN container_id TEXT GENERATED ALWAYS AS (
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CASE item_type
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WHEN 'Episode' THEN COALESCE(season_id, series_id, parent_id)
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WHEN 'Season' THEN COALESCE(series_id, parent_id)
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WHEN 'Audio' THEN COALESCE(album_id, parent_id)
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ELSE parent_id
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END
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) VIRTUAL;
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CREATE INDEX IF NOT EXISTS idx_items_container ON items(container_id, sort_name, name);
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INSERT OR IGNORE INTO items (id, server_id, library_id, name, item_type, is_folder, series_id, series_name)
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SELECT season_id, server_id, MAX(library_id), COALESCE(MAX(season_name), 'Season'), 'Season', 1,
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MAX(series_id), MAX(series_name)
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FROM items
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WHERE item_type = 'Episode' AND season_id IS NOT NULL
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GROUP BY season_id;
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INSERT OR IGNORE INTO items (id, server_id, library_id, name, item_type, is_folder)
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SELECT series_id, server_id, MAX(library_id), COALESCE(MAX(series_name), 'Series'), 'Series', 1
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FROM items
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WHERE item_type IN ('Episode', 'Season') AND series_id IS NOT NULL
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GROUP BY series_id;
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INSERT OR IGNORE INTO items (id, server_id, library_id, name, item_type, is_folder, album_artist)
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SELECT album_id, server_id, MAX(library_id), COALESCE(MAX(album_name), 'Album'), 'MusicAlbum', 1,
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MAX(album_artist)
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FROM items
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WHERE item_type = 'Audio' AND album_id IS NOT NULL
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GROUP BY album_id;
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"#;</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>One canonical “which container lists this item” link, plus an index that
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serves a listing in display order.</p>
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<p>Jellyfin’s <code>ParentId</code> is the <em>storage</em> parent, not the logical one: in a
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series without season folders an episode’s <code>ParentId</code> is the series while
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its <code>SeasonId</code> names a virtual season, and a cached episode may arrive
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without its season row at all. So listings matched children on four
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columns at once (<code>parent_id</code>, <code>album_id</code>, <code>season_id</code>, <code>series_id</code>). That
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was slow — the <code>OR</code> defeated the planner into walking the whole table — and
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wrong: every episode carries its series id, so a series answered with its
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seasons <em>and</em> all their episodes.</p>
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<p><code>container_id</code> resolves the logical container once, by rule: an episode
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belongs to its season (else its series, else its parent), a season to its
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series, a track to its album, anything else to its parent. It is a VIRTUAL
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generated column, so every write path — cache, downloads, catalog crawl —
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is covered without touching any of them, and it cannot drift from the
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columns it is computed from. The index covers the listing’s
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<code>ORDER BY sort_name, name</code> (<code>sort_name</code> is usually NULL in the cache).</p>
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<p>The placeholders keep offline navigation intact: an episode whose season
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or series row was never cached used to surface directly under the series
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through the <code>series_id</code> match. Now it lists under its season, so the season
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(and series, and a track’s album) must exist. They are built from the
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names the child rows already carry, with <code>synced_at</code> NULL — they only show
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when a download makes them available, and a real row from the server
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replaces them wholesale (<code>save_to_cache</code> upserts every field).</p>
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<p>TRACES: UR-002, UR-007 | DR-013</p>
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</div></details></section></div></main></body></html> |