habitica/migrations/mystery_items.js

var UserNotification = require('../website/server/models/userNotification').model

var _id = '';

var items = ['back_mystery_201801','headAccessory_mystery_201801']

var update = {
  $addToSet: {
    'purchased.plan.mysteryItems':{
      $each: items,
    }
  },
  $push: {
    notifications: (new UserNotification({
      type: 'NEW_MYSTERY_ITEMS',
      data: {
        items: items,
      },
    })).toJSON(),
  },
};

/*var update = {
  $set:{
    'purchased.plan':{
      customerId: "",
      dateCreated: new Date(),
      dateTerminated: null,
      dateUpdated:new Date(),
      gemsBought: 0,
      mysteryItems: [],
      paymentMethod: "Paypal",
      planId : "basic_earned"
    }
  }
};*/

if (_id) {
  // singular (missing items)
  db.users.update({_id: _id}, update);
} else {
  // multiple (once @ start of event)
  db.users.update({
      'purchased.plan.customerId': { $ne: null },
      $or: [
        { 'purchased.plan.dateTerminated': { $gte: new Date() } },
        { 'purchased.plan.dateTerminated': { $exists: false } },
        { 'purchased.plan.dateTerminated': { $eq: null } }
      ]
  }, update, { multi: true });
}