migration - add migration to support changed filename usage

tools/migration/change-gridfs-metadata-name-to-filename.js

@@ -0,0 +1,30 @@
+// for Node.js interpret
+/**
+ * change usage of GridFS filename
+ * see commit fb422b4d603c53a70712caba55b35a48a8c2e619
+ */
+
+const { default: DriveFile } = require('../../built/api/models/drive-file')
+
+async function applyNewChange (doc) {
+	const result = await DriveFile.update(doc._id, {
+		$set: {
+			filename: doc.metadata.name
+		},
+		$unset: {
+			'metadata.name': ''
+		}
+	})
+	return result.ok === 1
+}
+
+async function main () {
+	const oldTypeDocs = await DriveFile.find({
+		'metadata.name': {
+			$exists: true
+		}
+	})
+	return await Promise.all(oldTypeDocs.map(applyNewChange))
+}
+
+main().then(console.dir).catch(console.error)