Added a transactional email for when changes are made, to notify watchers.

app/models/CocoModel.coffee

@@ -60,6 +60,7 @@ class CocoModel extends Backbone.Model
     return result.errors unless result.valid
 
   save: (attrs, options) ->
+    @set 'editPath', document.location.pathname
     options ?= {}
     success = options.success
     options.success = (resp) =>

server/commons/Handler.coffee

@@ -4,6 +4,8 @@ Grid = require 'gridfs-stream'
 errors = require './errors'
 log = require 'winston'
 Patch = require '../patches/Patch'
+User = require '../users/User'
+sendwithus = require '../sendwithus'
 
 PROJECT = {original:1, name:1, version:1, description: 1, slug:1, kind: 1}
 FETCH_LIMIT = 200
@@ -293,6 +295,7 @@ module.exports = class Handler
         newDocument.save (err) =>
           return @sendDatabaseError(res, err) if err
           @sendSuccess(res, @formatEntity(req, newDocument))
+          @notifyWatchersOfChange(req.user, newDocument, req.body.editPath) if @modelClass.schema.is_patchable
 
       if major?
         parentDocument.makeNewMinorVersion(updatedObject, major, done)
@@ -300,6 +303,27 @@ module.exports = class Handler
       else
         parentDocument.makeNewMajorVersion(updatedObject, done)
 
+  notifyWatchersOfChange: (editor, changedDocument, editPath) ->
+    watchers = changedDocument.get('watchers') or []
+    watchers = (w for w in watchers when not w.equals(editor.get('_id')))
+    return unless watchers.length
+    User.find({_id:{$in:watchers}}).select({email:1, name:1}).exec (err, watchers) =>
+      for watcher in watchers
+        @notifyWatcherOfChange editor, watcher, changedDocument, editPath
+
+  notifyWatcherOfChange: (editor, watcher, changedDocument, editPath) ->
+    context =
+      email_id: sendwithus.templates.change_made_notify_watcher
+      recipient:
+        address: watcher.get('email')
+        name: watcher.get('name')
+      email_data:
+        doc_name: changedDocument.get('name') or '???'
+        submitter_name: editor.get('name') or '???'
+        doc_link: if editPath then "http://codecombat.com#{editPath}" else null
+        commit_message: changedDocument.get('commitMessage')
+    sendwithus.api.send context, (err, result) ->
+
   makeNewInstance: (req) ->
     model = new @modelClass({})
     model.set 'watchers', [req.user.get('_id')] if @modelClass.schema.is_patchable

server/patches/patch_handler.coffee

@@ -57,7 +57,8 @@ PatchHandler = class PatchHandler extends Handler
   onPostSuccess: (req, doc) ->
     log.error "Error sending patch created: could not find the loaded target on the patch object." unless doc.targetLoaded
     return unless doc.targetLoaded
-    watchers = doc.targetLoaded.get('watchers')
+    watchers = doc.targetLoaded.get('watchers') or []
+    watchers = (w for w in watchers when not w.equals(editor.get('_id')))
     return unless watchers?.length
     User.find({_id:{$in:watchers}}).select({email:1, name:1}).exec (err, watchers) =>
       for watcher in watchers

server/sendwithus.coffee

@@ -15,3 +15,4 @@ module.exports.templates =
   welcome_email: 'utnGaBHuSU4Hmsi7qrAypU'
   ladder_update_email: 'JzaZxf39A4cKMxpPZUfWy4'
   patch_created: 'tem_xhxuNosLALsizTNojBjNcL'
+  change_made_notify_watcher: 'tem_7KVkfmv9SZETb25dtHbUtG'

test/server/functional/patch.spec.coffee

@@ -52,7 +52,7 @@ describe '/db/patch', ->
       body = JSON.parse(body)
       expect(res.statusCode).toBe(200)
       expect(body.length).toBe(1)
-      done()
+      done() 
       
   it 'allows you to set yourself as watching', (done) ->
     watchingURL = getURL("/db/article/#{articles[0]._id}/watch")