rename with execution order, add desc & initial creation script

tools/migration/node.1510016282.change-gridfs-metadata-name-to-filename.js

@@ -0,0 +1,50 @@
+// 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 query = {
+		'metadata.name': {
+			$exists: true
+		}
+	}
+
+	const count = await DriveFile.count(query)
+
+	const dop = Number.parseInt(process.argv[2]) || 5
+	const idop = ((count - (count % dop)) / dop) + 1
+
+	return zip(
+		1,
+		async (time) => {
+			console.log(`${time} / ${idop}`)
+			const doc = await db.get('drive_files').find(query, {
+				limit: dop, skip: time * dop
+			})
+			return Promise.all(doc.map(applyNewChange))
+		},
+		idop
+	).then(a => {
+		const rv = []
+		a.forEach(e => rv.push(...e))
+		return rv
+	})
+}
+
+main().then(console.dir).catch(console.error)