topic Re: See Grouptype member elements without an instance present in Revit API Forum

See Grouptype member elements without an instance present

Anonymous — Fri, 15 Dec 2017 16:32:11 GMT

Hi!

Is it possible to somehow inquire about the elements inside a grouptype without having any instances of that group in the model? Specifically I need to look up if the GroupType contains any elements from one specific family and where these are positioned inside the group.

I know that it is possible to place an instance of that GroupType into the model, read the member elements and delete it afterwards. However this method needs transactions and gets quite slow, because I need to do this through Dynamo nodes.

Thanks,

Taavi

Re: See Grouptype member elements without an instance present

Anonymous — Tue, 19 Dec 2017 10:17:58 GMT

No replies?

Does it mean no-one knows how to do it or it is simply not possible?

Regards,

Taavi

Re: See Grouptype member elements without an instance present

Mustafa.Salaheldin — Thu, 21 Dec 2017 12:42:03 GMT

I'm afraid the answer is "not yet". You have to create an instance in an temporary transaction then get the elements type then roll back the transaction.

Re: See Grouptype member elements without an instance present

aignatovich — Fri, 22 Dec 2017 07:15:55 GMT

Hi!

There is another trick with temporary transactions, that can help you.

You can temporary delete your group type. Look at this is RevitPythonShell script code:

elem = selection[0] # select group type in project browser before running this

t = Transaction(doc, "temp")
t.Start()

ids = doc.Delete(elem.Id)

t.RollBack()

for id in ids:
	print id, doc.GetElement(id)

If you don't commit the transaction, it works very quick.

Use this approach if there are no group instances. If there are any, you can just get first Group in GroupType.Groups and get member ids via group.GetMemberIds() method

Re: See Grouptype member elements without an instance present

Anonymous — Wed, 27 Dec 2017 18:21:15 GMT

Thanks for the answers. These seem like good options, but it seems that in my case it is easier to just require that all groupTypes have an instance in the model and go from that.

Re: See Grouptype member elements without an instance present

Mark.Ackerley — Thu, 09 Jan 2020 09:03:35 GMT

Apologies, it was a different issue.