1 files changed, 6 insertions, 42 deletions

diff --git a/src/data/composite/things/track/withAlbum.js b/src/data/composite/things/track/withAlbum.js
index 143e097..03b840d 100644
--- a/src/data/composite/things/track/withAlbum.js
+++ b/src/data/composite/things/track/withAlbum.js
@@ -1,15 +1,10 @@
 // Gets the track's album. This will early exit if albumData is missing.
 // If there's no album whose list of tracks includes this track, the output
 // dependency will be null.
-//
-// This step models with Flash.withFlashAct.
 
 import {input, templateCompositeFrom} from '#composite';
-import {is} from '#validators';
 
-import {exitWithoutDependency, raiseOutputWithoutDependency}
-  from '#composite/control-flow';
-import {withPropertyFromList} from '#composite/data';
+import {withUniqueReferencingThing} from '#composite/wiki-data';
 
 export default templateCompositeFrom({
   annotation: `withAlbum`,
@@ -17,42 +12,11 @@ export default templateCompositeFrom({
   outputs: ['#album'],
 
   steps: () => [
-    exitWithoutDependency({
-      dependency: 'albumData',
-      mode: input.value('null'),
+    withUniqueReferencingThing({
+      data: 'albumData',
+      list: input.value('tracks'),
+    }).outputs({
+      ['#uniqueReferencingThing']: '#album',
     }),
-
-    withPropertyFromList({
-      list: 'albumData',
-      property: input.value('tracks'),
-    }),
-
-    {
-      dependencies: [input.myself(), '#albumData.tracks'],
-      compute: (continuation, {
-        [input.myself()]: track,
-        ['#albumData.tracks']: trackLists,
-      }) => continuation({
-        ['#albumIndex']:
-          trackLists.findIndex(tracks => tracks.includes(track)),
-      }),
-    },
-
-    raiseOutputWithoutDependency({
-      dependency: '#albumIndex',
-      mode: input.value('index'),
-      output: input.value({'#album': null}),
-    }),
-
-    {
-      dependencies: ['albumData', '#albumIndex'],
-      compute: (continuation, {
-        ['albumData']: albumData,
-        ['#albumIndex']: albumIndex,
-      }) => continuation.raiseOutput({
-        ['#album']:
-          albumData[albumIndex],
-      }),
-    },
   ],
 });