1 files changed, 10 insertions, 1 deletions
diff --git a/packages/idb-bridge/src/MemoryBackend.ts b/packages/idb-bridge/src/MemoryBackend.ts
index 786fa4cf6..694daacfa 100644
--- a/packages/idb-bridge/src/MemoryBackend.ts
+++ b/packages/idb-bridge/src/MemoryBackend.ts
@@ -640,7 +640,16 @@ export class MemoryBackend implements Backend {
     objectStoreProperties.indexes.push(indexName);
     schema.indexes[indexName] = indexProperties;
 
-    // FIXME: build index from existing object store!
+    const objectStore = myConn.objectStoreMap[objectStoreName];
+    if (!objectStore) {
+      throw Error("object store does not exist");
+    }
+
+    const storeData = objectStore.modifiedData || objectStore.originalData;
+
+    storeData.forEach((v, k) => {
+      this.insertIntoIndex(newIndex, k, v.value, indexProperties);
+    });
   }
 
   async deleteRecord(