How to set "NestedFamilyTypeReference" in Weld Symbol families?

Revit
8

Hi,
here is an example with Python (compatible all py-engines)

set Nested Family

import clr
import sys
import System

clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
uiapp = DocumentManager.Instance.CurrentUIApplication
uidoc = uiapp.ActiveUIDocument
app = uiapp.Application


def set_NestedParameter(paraToSet, lstParaIds, value_to_set):
	"""
	set parameter by list of NestedFamilyType and name of FamilyName
	"""
	for pId in lstParaIds:
		nestrefelem = doc.GetElement(pId)
		if value_to_set in nestrefelem.FamilyName:
			paraToSet.Set(pId)
			break

def toList(x):
	if isinstance(x, list):
		return x
	elif hasattr(x, "GetType") and x.GetType().GetInterface("IEnumerable") is not None:
		return x
	else :
		return [x]

elements = toList(UnwrapElement(IN[0]))
name_parameter = IN[1]
value_to_set = IN[2]

TransactionManager.Instance.EnsureInTransaction(doc)

for e in elements:
	#
	paraAnnot = e.LookupParameter(name_parameter)
	if paraAnnot is not None:
		currentSelectAnnot = paraAnnot.AsValueString()
		eTyp = doc.GetElement(e.GetTypeId())
		family = eTyp.Family 
		# get list of NestedFamilyType
		lstNestId = family.GetFamilyTypeParameterValues(paraAnnot.Id)
		# set Parmeter
		set_NestedParameter(paraAnnot, lstNestId, value_to_set)

TransactionManager.Instance.TransactionTaskDone()
		
OUT = elements
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