add migration to convert field for Apple subscribers

migrations/20180110_nextPaymentProcessing.js

@@ -0,0 +1,82 @@
+var migrationName = '20180110_nextPaymentProcessing.js';
+var authorName = 'paglias'; // in case script author needs to know when their ...
+var authorUuid = '7f14ed62-5408-4e1b-be83-ada62d504931'; //... own data is done
+
+/*
+ * Convert purchased.plan.nextPaymentProcessing from a double to a date field
+ */
+
+var monk = require('monk');
+var connectionString = 'mongodb://localhost:27017/habitrpg?auto_reconnect=true'; // FOR TEST DATABASE
+var dbUsers = monk(connectionString).get('users', { castIds: false });
+
+function processUsers(lastId) {
+  // specify a query to limit the affected users (empty for all users):
+  var query = {
+    'purchased.plan.paymentMethod': "Apple",
+    'purchased.plan.nextPaymentProcessing': {$type: 'double'},
+  };
+
+  if (lastId) {
+    query._id = {
+      $gt: lastId
+    }
+  }
+
+  dbUsers.find(query, {
+    sort: {_id: 1},
+    limit: 250,
+  })
+  .then(updateUsers)
+  .catch(function (err) {
+    console.log(err);
+    return exiting(1, 'ERROR! ' + err);
+  });
+}
+
+var progressCount = 100;
+var count = 0;
+
+function updateUsers (users) {
+  if (!users || users.length === 0) {
+    console.warn('All appropriate users found and modified.');
+    displayData();
+    return;
+  }
+
+  var userPromises = users.map(updateUser);
+  var lastUser = users[users.length - 1];
+
+  return Promise.all(userPromises)
+  .then(function () {
+    processUsers(lastUser._id);
+  });
+}
+
+function updateUser (user) {
+
+  var set = {
+    'purchased.plan.nextPaymentProcessing': new Date(user.purchased.plan.nextPaymentProcessing),
+  };
+
+  dbUsers.update({_id: user._id}, {$set: set});
+
+  if (count % progressCount == 0) console.warn(count + ' ' + user._id);
+}
+
+function displayData() {
+  console.warn('\n' + count + ' users processed\n');
+  return exiting(0);
+}
+
+function exiting(code, msg) {
+  code = code || 0; // 0 = success
+  if (code && !msg) { msg = 'ERROR!'; }
+  if (msg) {
+    if (code) { console.error(msg); }
+    else      { console.log(  msg); }
+  }
+  process.exit(code);
+}
+
+module.exports = processUsers;