create migration file

src/migrations/2021042016038-convert-double-to-date.js

@@ -0,0 +1,52 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:remove-deleteduser-from-relationgroup');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+const { getModelSafely } = require('@commons/util/mongoose-utils');
+
+module.exports = {
+  async up(db) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const Page = getModelSafely('Page') || require('@server/models/page')();
+
+    // const pages = await Page.count({
+    //   updatedAt: { $type: 'double' },
+    // });
+    const pages = await Page.aggregate(
+      [{
+        $match: {
+          updatedAt: { $type: 'double' },
+        },
+
+      },
+       {
+         $addFields: {
+           convertedDate: { $toDate: '$updatedAt' },
+         },
+       }],
+    );
+
+    console.log(pages, pages.length);
+
+    // await Page.bulkWrite([
+    //   {
+    //     updateMany:
+    //      {
+    //        filter: { updatedAt: { $type: 'double' } },
+    //        update: { updatedAt: { $convert: { input: 'updatedAt', to: 'date' } } },
+    //      },
+    //   },
+    // ]);
+
+    logger.info('Migration has successfully applied');
+
+  },
+
+  down(db) {
+    // do not rollback
+  },
+};