increment project version on every structure change

services/web/app/coffee/Features/Project/ProjectEntityMongoUpdateHandler.coffee

@@ -255,7 +255,7 @@ module.exports = ProjectEntityMongoUpdateHandler = self =
 				update["$push"][mongopath] = element
 				# we need to increment the project version number for any structure change
 				update["$inc"]["version"] = 1 # increment project version number
-				logger.log project_id: project._id, element_id: element._id, fileType: type, folder_id: folder_id, mongopath:mongopath, update: update, "adding element to project"
+				logger.log project_id: project._id, element_id: element._id, fileType: type, folder_id: folder_id, mongopath:mongopath, "adding element to project"
 				Project.findOneAndUpdate conditions, update, {"new": true}, (err, newProject)->
 					if err?
 						logger.err err: err, project_id: project._id, 'error saving in putElement project'

services/web/app/coffee/models/Project.coffee

@@ -22,6 +22,7 @@ ProjectSchema = new Schema
 	readOnly_refs     :   [ type:ObjectId, ref:'User' ]
 	rootDoc_id        :   {type: ObjectId}
 	rootFolder        :   [FolderSchema]
+	version           :   {type: Number}
 	publicAccesLevel  :   {type: String, default: 'private'}
 	compiler          :   {type:String, default:'pdflatex'}
 	spellCheckLanguage :   {type:String, default:'en'}

services/web/test/unit/coffee/Project/ProjectEntityMongoUpdateHandlerTests.coffee

@@ -117,7 +117,7 @@ describe 'ProjectEntityMongoUpdateHandler', ->
 				.calledWith(
 					{ _id: project_id },
 					{
-						'$inc': { 'file.png.rev': 1 }
+						'$inc': { 'file.png.rev': 1, 'version': 1 }
 						'$set': { 'file.png.created': new Date() }
 					}
 					{}
@@ -324,7 +324,7 @@ describe 'ProjectEntityMongoUpdateHandler', ->
 			@ProjectModel.findOneAndUpdate
 				.calledWith(
 					{ _id: project_id },
-					{ $set: { "mongo.path.name": @newName } },
+					{ $set: { "mongo.path.name": @newName }, $inc: {"version": 1} },
 					{ new: true }
 				).should.equal true
 
@@ -384,7 +384,7 @@ describe 'ProjectEntityMongoUpdateHandler', ->
 
 		it 'should pull', ->
 			@ProjectModel.findOneAndUpdate
-				.calledWith({ _id: @id }, { '$pull': { 'folders[0]': null } }, {'new': true})
+				.calledWith({ _id: @id }, { '$pull': { 'folders[0]': null }, '$inc': {'version': 1} }, {'new': true})
 				.should.equal true
 
 		it 'should call the callback', ->