Use lowercase `project_id`

services/web/app/coffee/Features/Labels/LabelsController.coffee

@@ -6,7 +6,7 @@ logger = require 'logger-sharelatex'
 module.exports = LabelsController =
 
 	getAllLabels: (req, res, next) ->
-		project_id = req.params.Project_id
+		project_id = req.params.project_id
 		LabelsHandler.getAllLabelsForProject project_id, (err, projectLabels) ->
 			if err?
 				logger.err {project_id, err}, "[LabelsController] error getting all labels from project"
@@ -14,7 +14,7 @@ module.exports = LabelsController =
 			res.json {projectId: project_id, projectLabels: projectLabels}
 
 	getLabelsForDoc: (req, res, next) ->
-		project_id = req.params.Project_id
+		project_id = req.params.project_id
 		doc_id = req.params.doc_id
 		LabelsHandler.getLabelsForDoc project_id, doc_id, (err, docLabels) ->
 			if err?

services/web/app/coffee/router.coffee

@@ -194,8 +194,8 @@ module.exports = class Router
 		webRouter.get  '/Project/:Project_id/download/zip', AuthorizationMiddlewear.ensureUserCanReadProject, ProjectDownloadsController.downloadProject
 		webRouter.get  '/project/download/zip', AuthorizationMiddlewear.ensureUserCanReadMultipleProjects, ProjectDownloadsController.downloadMultipleProjects
 
-		webRouter.get '/project/:Project_id/labels', AuthorizationMiddlewear.ensureUserCanReadProject, AuthenticationController.requireLogin(), LabelsController.getAllLabels
-		webRouter.get '/project/:Project_id/:doc_id/labels', AuthorizationMiddlewear.ensureUserCanReadProject, AuthenticationController.requireLogin(), LabelsController.getLabelsForDoc
+		webRouter.get '/project/:project_id/labels', AuthorizationMiddlewear.ensureUserCanReadProject, AuthenticationController.requireLogin(), LabelsController.getAllLabels
+		webRouter.get '/project/:project_id/:doc_id/labels', AuthorizationMiddlewear.ensureUserCanReadProject, AuthenticationController.requireLogin(), LabelsController.getLabelsForDoc
 
 		webRouter.get    '/tag', AuthenticationController.requireLogin(), TagsController.getAllTags
 		webRouter.post   '/tag', AuthenticationController.requireLogin(), TagsController.createTag

services/web/test/UnitTests/coffee/Labels/LabelsControllerTests.coffee

@@ -25,7 +25,7 @@ describe 'LabelsController', ->
 		beforeEach ->
 			@fakeLabels = {'somedoc': ['a_label']}
 			@LabelsHandler.getAllLabelsForProject = sinon.stub().callsArgWith(1, null, @fakeLabels)
-			@req = {params: {Project_id: @projectId}}
+			@req = {params: {project_id: @projectId}}
 			@res = {json: sinon.stub()}
 			@next = sinon.stub()
 
@@ -46,7 +46,7 @@ describe 'LabelsController', ->
 		describe 'when LabelsHandler.getAllLabelsForProject produces an error', ->
 			beforeEach ->
 				@LabelsHandler.getAllLabelsForProject = sinon.stub().callsArgWith(1, new Error('woops'))
-				@req = {params: {Project_id: @projectId}}
+				@req = {params: {project_id: @projectId}}
 				@res = {json: sinon.stub()}
 				@next = sinon.stub()
 
@@ -69,7 +69,7 @@ describe 'LabelsController', ->
 			@LabelsHandler.getLabelsForDoc = sinon.stub().callsArgWith(2, null, @fakeLabels)
 			@EditorRealTimeController.emitToRoom = sinon.stub()
 			@docId = 'somedoc'
-			@req = {params: {Project_id: @projectId, doc_id: @docId}}
+			@req = {params: {project_id: @projectId, doc_id: @docId}}
 			@res = {json: sinon.stub()}
 			@next = sinon.stub()
 
@@ -100,7 +100,7 @@ describe 'LabelsController', ->
 				@LabelsHandler.getLabelsForDoc = sinon.stub().callsArgWith(2, new Error('woops'))
 				@EditorRealTimeController.emitToRoom = sinon.stub()
 				@docId = 'somedoc'
-				@req = {params: {Project_id: @projectId, doc_id: @docId}}
+				@req = {params: {project_id: @projectId, doc_id: @docId}}
 				@res = {json: sinon.stub()}
 				@next = sinon.stub()