[BUG] Livechat: Forward by Department not working.

[pkgodara]

Description:

When Agent tries to forward live chat to another department, it throws an error:
Exception while invoking method 'livechat:transfer' TypeError: RocketChat.models.Rooms.removeUsernameById is not a function

Steps to reproduce:

1. Click on Visitor Info of live chat room
2. Click on Forward
3. Select a department from Forward to department dropdown.
4. Click on Forward

You'll see error on server console.

Expected behavior:

Livechat should be transferred to respective department.

Actual behavior:

Server throws error.

Server Setup Information:

• Version of Rocket.Chat Server: 0.69.0-develop (commit hash 2968549)
• Operating System: darwin
• Deployment Method: Manual
• Number of Running Instances: 1
• NodeJS Version: 8.11.3 - x64

Relevant logs:

Exception while invoking method 'livechat:transfer' TypeError: RocketChat.models.Rooms.removeUsernameById is not a function at Object.returnRoomAsInquiry (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/rocketchat_livechat.js:5261:29) at Object.transfer (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/rocketchat_livechat.js:5171:34) at MethodInvocation.livechat:transfer (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/rocketchat_livechat.js:2412:32) at MethodInvocation.methodsMap.(anonymous function) (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/rocketchat_lib.js:2506:36) at MethodInvocation.methodMap.(anonymous function) (packages/rocketchat_monitoring.js:2731:30) at maybeAuditArgumentChecks (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:1877:12) at DDP._CurrentMethodInvocation.withValue (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:902:126) at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1186:12) at DDPServer._CurrentWriteFence.withValue (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:902:98) at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1186:12) at Promise (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:902:46) at new Promise (<anonymous>:null:null) at Session.method (/Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:875:23) at /Users/pk/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:754:85

[MartinSchoeler]

@renatobecker