Hello together! I need help creating a Dynamo script. First of all, I am a complete beginner and only started to deal with it today. The following problem exists: I want to enter the respective cost groups for my pipes based on my individual pipe systems. This should be solved with a Dynamo script. I have now started to create this, but I can’t get any further. What am I doing wrong? To explain again, I want to enter different cost groups for each individual pipe in my project, which have different pipe systems. I hope this is understandable. Thanks in advance!
Welcome to the community! You are starting out on the right track with collecting all the elements. Assuming you are wanting to group the elements by the “Systemtyp” parameter value, look at the “List.GroupByFunction” node. Note: when using that node, you do not feed the element list into the get parameter node. Example below.
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Thank you for the quick response! Great forum! Unfortunately, I still have an issue. I tried it as you suggested, but it doesn’t seem to sort the individual pipe systems under the “Systemtyp.” Am I doing something wrong? Additionally, my plan was to group the pipe systems using List.GroupByFunction , and then use List.Create along with a code block to assign the corresponding cost group to each individual pipe system. This way, you could easily label all pipes with cost groups in just one click. Thank you!
Not sure but systemtyp shouldnt it be systemtype ?
Yes but its in German. This is exactly how its called in Revit in my Project.
arhh ok not so strong in german 
My issue is that the pipes here are not sorted (highlighted in yellow). I would need to sort the pipes into system types in this area. Currently, I have 5279 pipes, and there might be around 50 system types in my project. This would, of course, be much easier to manage. What am I doing wrong here?
could it work if you use ootb getparameter.value.byname instead of get.parameteras value string
Unfortunately, the same problem
I Finally, I’ve managed to sort the pipes using a different parameter. Now I’m facing just one last hurdle. When I try to input the parameter using “Element.SetParameterByName,” it keeps showing me an error message. Could I have possibly connected Element.SetParameterByName incorrectly?
Btw its an Instance Parameter. Maybe thats why it dosent work?
You are feeding the keys into the set parameter node and not the elements. Feed the groups output into the set parameter node. If you still have issues, try using the set parameter by type or instance from Rhythm package. These cover both type and instance parameters, so eliminates you having to get the element type when dealing with type parameters.
Thanks, the only problem is, i dont wont to set the parameter value on the groups tab because hes not sorting on the parameter like i wanted. On the unqiue Keys hes giving me exactly like i wantend to be in that list. Is there a thing i missing right now?
You have to feed elements into the element set parameter node or else it will give an error. You have 25 keys, so you should have 25 grouped list with each group containing the same key value in the corresponding parameter. First group contains “TW (PWC)”, second group contains “TW (PWH_C)” and so forth.
One other thing, you only have 4 sets of “Costgroup” values and 25 groups of elements, so basically the script is going to input “1111” in all the elements in the first group, “2222” in all the elements of the second group and “3333” to the third group, every group after that will get “4444”. Please explain exactly what you are wanting to accomplish?
I have now sorted and grouped my pipes into the required parameters using List.Groupbykey. This has worked so far. I now want to enter a value in my pipes using Setparameter, which will be entered depending on which pipe system is chosen. This means that my pipe has a system type of ‘TW (PWC)’ and another pipe has ‘TW (PWH-C)’. The two should then receive different values, depending on what is entered in Setparameter under ‘Codeblock’. This means that each pipe equipped with the system type ‘TW (PWC)’ will have ‘CostGroup’ 1111. I did not continue the value further because I want to test whether this works first. I hope it is clear now.
Okay thank you for explaining. The set parameter node should write the values accordingly per each group. If it doesn’t then you will need to set the lacing to longest by right clicking on the node and follow as shown. Most important note is that the number of costs needs to match the number of grouped elements.
I apologize for the late response. Unfortunately, I have been very busy lately. Now I am dedicating myself to my problem in Dynamo. I have tried this as you wrote it, unfortunately without success. The list is sorted in such a way that I could enter the parameters there. This worked well, and you can also see under “Watch” that the sorting works. I just wonder how to capture the individual groups after sorting and enter the values of the cost group there. Unfortunately, I am missing the last step to accomplish this.
Aside from the grouping issue, what you show in your clip is incorrect. You are inputting a number from the list count into the element input of the set parameter node. You have to input the elements straight from the watch node.
EDIT: Actually I was incorrect with my statement above. The watch node contains the keys for which you were grouping the elements by. You need to feed the groups output from the list group by key node into the elements input of the set parameter node. Sorry for the confusion.
Is it possible to enter a value into the parameter after using SortByKey ? Initially, I have all elements of the ‘Category’ and have extracted pipes from the model. Then I use GetParameter and sort the pipes based on my parameter, which in this case is ‘System Type.’ Subsequently, I sort them using SortByKey , and the list is accurate. That means it has created a list for me with 25 different system types. Afterward, I want it to access that sorted list and populate the desired parameter using Elements.SetParameterByNameOrInstance for the pipes. My wish is simply to sort the pipes based on the desired parameter and use the sorting to populate values into the desired ‘Cost Group’ parameter. Perhaps this is straightforward for someone familiar with it, but unfortunately, it’s not working for me.
See my edit statement above. You should have (25) groups of elements feeding into the elements input of the set parameter node. The groups list should coincide with how you have your (25) values. Meaning group 1 should get the first value in the list (1111), group 2 should get the second value in the list (2222) and so forth. Once you have your lists set like that, then it would be just a matter of setting the lacing and the levels of the set parameter node so that it writes out each value on per group basis.
