Calling removeMultiInstance multiple times fails

[mydrako]

Hey,
I notice a strange thing when I am using removeMultiInstance. When i try to call it to remove element from a multi-index attribute, it works fine when i call it once in a function call. However, when i put this call in a loop, and call it to remove many elements, it does not remove all the element that I wanted. So i went to investigate. Running the command by itself works fine but have the command sequentially and running it fails. Have anyone notice that happening?

[pilou--2]

May be this is a silly answer but did you check that you increment the name of the attribute you want  to remove in your loop like it should be ?

[mydrako]

Yes I did I did a test like this. I have a null with a multiAttribute called stringList with index 0, 1, 2, each with some string value.

So i try to run this python command:
cmds.removeMultiInstance('null.stringList[2]')
cmds.removeMultiInstance('null.stringList[1]')

What i end up with is index 2 got removed, and index one remained undeleted, but with its value erased.

If i run each command separately, it works.

Can someone try to see if this is a real bug and is there ways to solve it?

[mydrako]

I hope there are some one out there that would have a answer for my problem. Anyone have any insight?

[wrend]

Ovious this response too late for OP, but because I trawled this up as others will likely do in future:

This is to do with Maya's AttributeEditor tempalte handling of multi's. It is recreating (some) of your multis post-deletion.

If you dont let the AEd see your node (or, dont expose your multi attributes [presumably]), then you wont have a poblem. There are solutions to preventing this behaviour of the AEd, but they are a touch intefere-y with the base, so i wont post.

Handling of multis and undo/redo is another matter altogether, and is going to proove a headache as we go into supporting undo across the board for large rig setups. I think 2015 api added support for deletion of multis, so this may well harbour for greater undo support on multis, yet to see.