write migration file

src/migrations/20200827045151-remove-layout-setting.js

@@ -0,0 +1,60 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:remove-layout-setting');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+const { getModelSafely } = require('@commons/util/mongoose-utils');
+
+module.exports = {
+  async up(db, client) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const Config = getModelSafely('Config') || require('@server/models/config')();
+
+    const layoutType = await Config.findOneAndDelete({ key: 'customize:layout' });
+
+    const promise = [
+      // remove layout
+      Config.findOneAndDelete({ key: 'customize:layout' }),
+    ];
+
+    if (layoutType.value === '"kibela"') {
+      promise.push(
+        Config.update(
+          { key: 'customize:theme' },
+          { value: JSON.stringify('kibela') },
+        ),
+      );
+    }
+
+    await Promise.all(promise);
+
+    logger.info('Migration has successfully applied');
+  },
+
+  async down(db, client) {
+    logger.info('Rollback migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const Config = getModelSafely('Config') || require('@server/models/config')();
+
+    const insertConfig = new Config({
+      ns: 'crowi',
+      key: 'customize:layout',
+      value: JSON.stringify('kibela'),
+    });
+
+    await Promise.all([
+      insertConfig.save(),
+
+      Config.update(
+        { key: 'customize:theme', value: JSON.stringify('kibela') },
+        { value: JSON.stringify('default') },
+      ),
+    ]);
+
+    logger.info('Migration has been successfully rollbacked');
+  },
+};