1 files changed, 14 insertions, 5 deletions
diff --git a/app/scripts/lib/migrator/index.js b/app/scripts/lib/migrator/index.js
index 02d8c2335..ab5a757b3 100644
--- a/app/scripts/lib/migrator/index.js
+++ b/app/scripts/lib/migrator/index.js
@@ -7,22 +7,31 @@ class Migrator {
     this.migrations = migrations.sort((a, b) => a.version - b.version)
     let lastMigration = this.migrations.slice(-1)[0]
     // use specified defaultVersion or highest migration version
-    this.defaultVersion = opts.defaultVersion || lastMigration && lastMigration.version || 0
+    this.defaultVersion = opts.defaultVersion || (lastMigration && lastMigration.version) || 0
   }
 
   // run all pending migrations on meta in place
-  migrateData (meta = { version: this.defaultVersion }) {
+  migrateData (versionedData = this.generateInitialState()) {
     let remaining = this.migrations.filter(migrationIsPending)
     
     return (
-      asyncQ.eachSeries(remaining, (migration) => migration.migrate(meta))
-      .then(() => meta)
+      asyncQ.eachSeries(remaining, (migration) => migration.migrate(versionedData))
+      .then(() => versionedData)
     )
 
     // migration is "pending" if hit has a higher
     // version number than currentVersion
     function migrationIsPending(migration) {
-      return migration.version > meta.version
+      return migration.version > versionedData.meta.version
+    }
+  }
+
+  generateInitialState (initState) {
+    return {
+      meta: {
+        version: this.defaultVersion,
+      },
+      data: initState,
     }
   }