How to refer to items in a value list by their 'Name'

Question

Hi, I've got some code in a workflow where depending on one source property, we're setting another destination property 'Type' 
 'Type' is a value list which contains: 
 Programme, ID = 1 
 Project, ID = 2 
 etc 
 
 Previously I was doing that via just setting the ID number. I know that Project is ID=2 in the Type value list, so I have that ID number hard coded in the script 
 
 However, the vault is due to be deployed to production via content replication rather than transferring an .MFB so we've been told that all ID number references should be avoided and everything needs to use aliases instead, as the ID numbers may get shuffled around in the transition and won't stay in the same order 
 
 So, How can I avoid using the ID? I know the value in the source property will be 'Project', so do I have to construct a search to find the item within the value list that matches, then I can get the (new) ID number, and use that ID as previously? or is there some better approach 
 Many thanks

bright-ideas.dk · Accepted Answer

The ID numbers will change in replication if someone manually adds an item in the receiving vault. This new item will automatically take the next ID available. This ID will then be taken when replication pulls in a new item from the external vault, and the incoming item will have to change ID to the next available number.

Spooky · Answer

Many thanks both 
 The original version used a hardcoded ID, 
 
 oOnePropVal.TypedValue.SetValue MFDataTypeLookup, 2

Instead, we now find the Value List's ID by its Alias, Then find the Value List ITEM's ID (from within that value list) by its hardcoded GUID Then use that ID in place of the hardcoded one 
 Dim lValueListID : lValueListID = Vault.ValueListOperations.GetValueListIDByAlias("H.ValueList.ProjectType")
Dim lValueListItemID : lValueListItemID = Vault.ValueListItemOperations.GetValueListItemIDByGUID(lValueListID, "6AEC39DE-7434-4FC9-AF8B-94E56A39B0E7")
oOnePropVal.TypedValue.SetValue MFDataTypeLookup, lValueListItemID

Craig Hawker · Answer

You're correct: replication will make the IDs change. 
 You have two options: 
 
 Search for the value list item by name , then use the ID of the value list item that comes back. 
 Get the item ID by the GUID of the value list item. I am 90% sure that item GUIDs will stay the same across replication, so your code can look for the known GUID and it should be able to return the correct value item in the production vault. 
 
 I personally don't like to use the value list item name for anything, as it's too easy for someone to say "oh, yes, we now spell it 'Program'", change the value list item name, and all hell opens up. For that reason - and I will try to double-check about the GUIDs for you - I would probably lean towards the second option.

Craig Hawker · Answer

I don't think that makes one bit of difference. 
 That said: if you have a local M-Files vault with the exact list you want to use, you could create a replication package containing just that list and its values, export it, and then import it into a blank vault for testing. That's exactly what I did, but you could test it with your exact structure if you have concerns. 
 Edit: having read the response from bright-ideas.dk , then having re-read your post, I realise that I misread it. As he said said: the IDs happen to be the same in this case, but may not be in yours. You need to assume that they will be different even though in some cases - especially when replicating into a blank vault - they may happen to end up the same.

Craig Hawker · Answer

I just did a quick replication package export of a value list and items from one vault to another. The IDs stayed the same. Below is a screenshot showing the snip I took of the source vault, and the data from the target vault after import: 
 
 So, yes, use the GUIDs.

How to refer to items in a value list by their 'Name'

Top Replies