change email address in newsletter when changing default email

put mongo_id into mailchimp merge fields

services/web/app/coffee/Features/Newsletter/NewsletterManager.coffee

@@ -4,7 +4,6 @@ Settings = require 'settings-sharelatex'
 crypto = require('crypto')
 Mailchimp = require('mailchimp-api-v3')
 
-
 if !Settings.mailchimp?.api_key?
 	logger.warn "No newsletter provider configured so not chaning email on user"
 	mailchimp =
@@ -63,5 +62,6 @@ buildOptions = (user, is_subscribed)->
 			merge_fields:
 				FNAME: user.first_name
 				LNAME: user.last_name
+				MONGO_ID:user._id
 	return opts
 

services/web/app/coffee/Features/User/UserUpdater.coffee

@@ -100,15 +100,21 @@ module.exports = UserUpdater =
 	setDefaultEmailAddress: (userId, email, callback) ->
 		email = EmailHelper.parseEmail(email)
 		return callback(new Error('invalid email')) if !email?
-		query = _id: userId, 'emails.email': email
-		update = $set: email: email
-		@updateUser query, update, (error, res) ->
-			if error?
-				logger.err error:error, 'problem setting default emails'
+		UserGetter.getUserEmail userId, (error, oldEmail) =>
+			if err?
 				return callback(error)
-			if res.n == 0 # TODO: Check n or nMatched?
-				return callback(new Error('Default email does not belong to user'))
-			callback()
+			query = _id: userId, 'emails.email': email
+			update = $set: email: email
+			@updateUser query, update, (error, res) ->
+				if error?
+					logger.err error:error, 'problem setting default emails'
+					return callback(error)
+				else if res.n == 0 # TODO: Check n or nMatched?
+					return callback(new Error('Default email does not belong to user'))
+				else
+					NewsletterManager.changeEmail oldEmail, email, callback
+
+
 
 	updateV1AndSetDefaultEmailAddress: (userId, email, callback) ->
 		@updateEmailAddressInV1 userId, email, (error) =>