How Purge Family Documents

[luupieper]

Does anyone know how to purge families itselfs (not the project where they are)? I’m trying to, with the dynamo open in the project where the families are, open all the families, purge them and then load them back to the same project

I tried all of this nodes:

but none of them seams to work with families… sometimes I get “null” others I get
“Warning: Document.Purge operation failed.
Modifying is forbidden because the document has no open transaction”

I tried this routine too:

Open Families from a Directory, Purge a Category, Load and Save

The following graph will load a family from a directory, delete all unused Family and Family Types of a Category, then Save and/or Load the family into the current project. [Families%20-%20Open%20-%20Clean%20-%20Load%20Details%20Item%20Families%20from%20Directory] Here is the core code in the “Open Document & Clean” node: import System import clr clr.AddReference("RevitNodes") import Revit clr.AddReference('RevitAPI') from Autodesk.Revit.DB import * clr.AddReference('RevitServices') import R…

But then I get a list of empty lists

Ps. I noticed some people have tried a while ago:

Ungrouping & Purging All Families in a Model

Hello. New to Dynamo here so go easy please. I am hoping that I can use Dynamo to achieve the following - opening each family loaded into a model, ungrouping all elements, purging, and loading them back into the model. Am I being too optimistic? This is because a job we’re working on has got 2300+ families loaded - it is a historic building with a lot of bespoke content. The company who produced the point cloud based 3D survey grouped all elements in each family before saving it. I have worked…

Purge items in families

Last I heard Purge is not available in the API. You can play the dangerous game of checking for unplaced family types/elements and deleting them but that’s not suggested.

Does any one have a clue?
Thanks a lot

[Alban_de_Chasteigner]

Hi @luupieper,

This can be easily fixed.
I sent you by private message an updated version of the Purge Unused node.

[mirko.maccarronello]

Hi,

I have the same problem with the purge script.

Can you help me please?*

regards

Mirko

[luupieper]

Hello @mirko.maccarronello, I don’t think there is an answer to this problem yet. @Alban_de_Chasteigner is working on a new version of nodes, and he said he will have a look if he can add a Document input for the node.

[Alban_de_Chasteigner]

Hi @mirko.maccarronello,

I’ve added a document input and that seems to work. The updated node will be in the next update of the package.

[mirko.maccarronello]

Hi Alban,

where I can find the Genius_Loci_Purge_Unused node?

Regards

Mirko

[kapilp7W8RU]

Hi @mirko.maccarronello
Genius Loci 2021.6.3 ,
by using this node element get deleted . so is there any problem to using it in live project.

[vanman]

Howdy, giving this a go with R23 dynamo 2.16 but it dosnt seem to be purging

[Alban_de_Chasteigner]

Hi,
The Purge Unused node is expecting a Revit.DB.Document and not a Dynamo Revit.Application.Document.
Use the Rhythm Documents.DynamoDocumentToDbDocument node to perform the required “conversion”.

[vanman]

Works a charm now!

[Afreteur]

Hello !
Thanks for the updated Purge Unused node.
I noticed that all the materials assigned to a parameter in my families are gone after the purge.
I understand that if those materials are unused they will be deleted but there are used in Type parameter and so when I load the families back in my project they lose all the materials assignement…

Is this a normal behaviour ?

Are material not considered as used even if they are assigned to a parameter in my types ?
This is not the case in my project purge but this is a problem only with purge in FamilyDocument …

[GavinCrump]

If i recall correctly purge unused nodes in packages generally manually check for use of objects unless they took advantage of the revit api additions in revit 2024 for purge unused (or was it 2025… i forget…). Might be a limitation of the node as it’s not default purge behavior to purge materials used by families loaded in the model, even if unplaced.