fix(groups): migration to restore disrupted user data

migrations/archive/2019/20190716_groups_fix.js

@@ -0,0 +1,67 @@
+/* eslint-disable no-console */
+const MIGRATION_NAME = '20190716_groups_fix';
+
+import monk from 'monk';
+import nconf from 'nconf';
+const CONNECTION_STRING = nconf.get('MIGRATION_CONNECT_STRING');
+let backupUsers = monk(CONNECTION_STRING).get('users', { castIds: false });
+import { model as User } from '../../../website/server/models/user';
+
+const progressCount = 1000;
+let count = 0;
+
+async function updateUser (user) {
+  count++;
+
+  let set = { migration: MIGRATION_NAME };
+  let addToSet;
+
+  backupUsers.findOne(
+    { _id: user._id },
+    { fields: { party: 1, guilds: 1 }}
+  ).then((backupUser) => {
+    if (!user.party._id) {
+      set.party = backupUser.party;
+    }
+    addToSet = { guilds: { $each: backupUser.guilds }};
+  });
+
+  if (count % progressCount === 0) console.warn(`${count} ${user._id}`);
+
+  return await User.update({ _id: user._id }, { $set: set, $addToSet: addToSet }).exec();
+}
+
+module.exports = async function processUsers () {
+  let query = {
+    migration: {$ne: MIGRATION_NAME},
+    'auth.timestamps.loggedin': {$gt: new Date('2019-07-17')},
+  };
+
+  const fields = {
+    _id: 1,
+    party: 1,
+    guilds: 1,
+  };
+
+  while (true) { // eslint-disable-line no-constant-condition
+    const users = await User // eslint-disable-line no-await-in-loop
+      .find(query)
+      .limit(250)
+      .sort({_id: 1})
+      .select(fields)
+      .lean()
+      .exec();
+
+    if (users.length === 0) {
+      console.warn('All appropriate users found and modified.');
+      console.warn(`\n${count} users processed\n`);
+      break;
+    } else {
+      query._id = {
+        $gt: users[users.length - 1],
+      };
+    }
+
+    await Promise.all(users.map(updateUser)); // eslint-disable-line no-await-in-loop
+  }
+};