Assiated Family Paramter (Built In paramter in Point with a user define paramter in family document)

Developers
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1

I am working in Family Document and i am trying to associate family paramter between a point paramter (“Offset” Built in paramter) with a family paramter (User define paramter)

I wrote this script but the last method is not accepting the input

# Import the necessary Dynamo and Revit libraries
import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

# Import the Dynamo library for working with Revit elements
clr.AddReference('DSCoreNodes')
import DSCore
from DSCore import *
clr.AddReference("RevitServices") 
from RevitServices.Transactions import TransactionManager
from RevitServices.Persistence import DocumentManager 
# Define the Family document
doc = DocumentManager.Instance.CurrentDBDocument 
# The inputs to this node will be stored as a list in the IN variables.
point = UnwrapElement(IN[0])
nameParamter = IN[1]
FamParameter = IN[2]
poi = []
fam = []

# Get the Element Parameter
point = UnwrapElement(IN[0])
pointParas = point.Parameters
for item in pointParas:
    if item.Definition.Name == nameParamter:
        poi.append(item)

# Get the Family Parameter 
listPara = doc.FamilyManager.Parameters
for item in listPara:
    if item.Definition.Name == FamParameter:
        fam.append(item)
#code below this line
TransactionManager.Instance.EnsureInTransaction(doc)
doc.FamilyManager.AssociateElementParameterToFamilyParameter(poi,fam)

TransactionManager.Instance.TransactionTaskDone()
# Assign your output to the OUT variable.
OUT = fam

2023-09-17_21h11_54
2023-09-17_21h11_541767×539 153 KB

3

Hi @m.saleh.tum
It is helpful to provide a screen shot of the warning for additional context.

You are building lists for the parameters when the AssociateElementParameterToFamilyParameter method accepts an element parameter and a family parameter

Rather than building lists and checking for parameters with a for loop you can use built in methods to get the parameters using their name such as poi = point.LookupParameter(nameParameter) or poi = point.GetParameters(nameParameter)[0] for a list if there are multiple parameters with the same name

Once we have our parameter we can check if it can be associated doc.FamilyManager.CanElementParameterBeAssociated(poi) before proceeding

The FamilyManager is not so flexible so using a for loop to get the family parameter works. You could also do this with a list comprehension and take the first item fam = [p for p in doc.FamilyManager.Parameters if p.Definition.Name == FamParameter].pop(0)

So now we can try code like this

output = []
# Get the Element Parameter
point = UnwrapElement(IN[0])
poi = point.LookupParameter(nameParameter)  # Note: fixed typo

output.append([poi.Definition.Name, poi])

if doc.FamilyManager.CanElementParameterBeAssociated(poi):
    # Get the Family Parameter
    fam = [p for p in doc.FamilyManager.Parameters if p.Definition.Name == FamParameter].pop(0)
    output.append([fam.Definition.Name, fam])
    
    TransactionManager.Instance.EnsureInTransaction(doc)
    doc.FamilyManager.AssociateElementParameterToFamilyParameter(poi,fam)
    TransactionManager.Instance.TransactionTaskDone()
    
OUT = output
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