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fix(plex): Also read MBIDs from `guid` field
Some items on Plex store the MBID in the `guid` field in the `Metadata`
response, not in the `Guid` field. This change checks the `guid` field
as a fallback if the `Guid` field is not set.
Owen D'Aprile
(Mar 10, 2026, 8:24 PM EDT)
ebc0aa8a
d10ecb88
+32
-10
+32
-10
src/backend/sources/PlexApiSource.ts
+32
-10
src/backend/sources/PlexApiSource.ts
···
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export const LOCAL_USER = 'PLEX_LOCAL_USER';
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+
const MBID_PREFIX = "mbid://";
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+
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const THUMB_REGEX = new RegExp(/\/library\/metadata\/(?<ratingkey>\d+)\/thumb\/\d+/)
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export default class PlexApiSource extends MemoryPositionalSource {
···
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getNewPlayer = (logger: Logger, id: PlayPlatformId, opts: PlayerStateOptions) => new PlexPlayerState(logger, id, opts);
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getMusicBrainzId = async (ratingKey: string | undefined): Promise<string | undefined> => {
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-
if (!ratingKey) {
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-
return null;
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+
if (ratingKey === undefined) {
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+
return undefined;
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}
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const cachedMbId = await this.mbIdCache.get(ratingKey);
···
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);
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const result = await request.json();
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+
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let mbid: string | null = null;
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// There shouldn't be multiple metadata or GUID objects, but we return
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// the first MBID to be safe.
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-
for (const metadata of result.MediaContainer.Metadata ?? []) {
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-
for (const guid of metadata.Guid ?? []) {
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-
if (typeof guid.id === "string" && guid.id.startsWith("mbid://")) {
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-
const mbid = guid.id.replace("mbid://", "");
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-
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-
await this.mbIdCache.set(ratingKey, mbid);
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-
return mbid;
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+
metadataLoop: for (const metadata of result?.MediaContainer?.Metadata ?? []) {
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+
this.logger.trace(`Guid: '${metadata.Guid?.map(g => g.id)?.join(", ")}', guid: '${metadata.guid}'`)
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+
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+
if (Array.isArray(metadata.Guid)) {
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+
for (const guid of metadata.Guid) {
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+
if (typeof guid.id === "string" && guid.id.startsWith(MBID_PREFIX)) {
581
+
mbid = guid.id.replace(MBID_PREFIX, "");
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+
break metadataLoop;
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+
}
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}
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}
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+
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+
// Some matched items store the MBID in the `MediaContainer.Metadata.guid` field,
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+
// so we check that as a fallback if there are no objects in the `Guid` field.
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+
if (typeof metadata.guid === "string" && metadata.guid.startsWith(MBID_PREFIX)) {
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+
mbid = metadata.guid.replace(MBID_PREFIX, "");
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+
break metadataLoop;
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+
}
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}
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+
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+
this.logger.trace(`Extracted MBID: '${mbid}'`);
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+
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+
await this.mbIdCache.set(ratingKey, mbid);
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+
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+
if (mbid === null) {
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+
return undefined
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+
}
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+
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+
return mbid;
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} catch (e) {
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this.logger.warn(new Error(`Failed to get MusicBrainz IDs from Plex for item ${ratingKey}`, {cause: e}));
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}
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-
this.mbIdCache.set(ratingKey, null);
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return undefined;
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}
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}