Get a plug for an aliased multi / compound plug in API

[Paul Molodowitch]

Hey all - so, I have an alias which refers to an multi-compound attribute:

import maya.cmds as cmds

remap = cmds.createNode('remapValue')

cmds.aliasAttr ('alfred', remap + '.value[0].value_Position')

print cmds.aliasAttr(remap, q=1)

So far so good. Now, using the api, and starting with just the alias name, I want to be able to get an MPlug for the plug it points to.  Unfortunately, I haven't found a way to do this.  The obvious way - using MFnDependencyNode.findAlias - only gives me a plug for the base attribute, not the specific index / child the alias actually refers to:

import maya.OpenMaya as om

sel = om.MSelectionList()

sel.add(remap)

obj = om.MObject()

sel.getDependNode(0, obj)

mfn = om.MFnDependencyNode(obj)

attr = om.MObject()

mfn.findAlias('alfred', attr)

plug = om.MPlug(obj, attr)

print plug.partialName(True, True, True, False, True, True)

However, what we end up with is remapValue1.value, not remapValue1.value[0].value_Position

Should I just be using getAliasList, and then feeding the text string into an MSelectionList?  If so, what's the point of findAlias?

- Paul

[Miguel González Viñé]

Did you solve this or anyone knows how to get the MPlug from the alias name in a MFnDependencyNode?

Also I've tried with getAliasAttr but I don't know what to do with the returned MObject.

Thank you!

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[Paul Molodowitch]

If I recall correctly, I just had to do  a getAliasAttr / MSelectionList combo, as I suggested.  Not sure when you would want to use findAlias (since it seems unreliable)...

- Paul

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[Miguel González Viñé]

Thanks for your reply Paul.

Did you mean getAliasList instead of getAliasAttr, right? With this option I get a list with the aliases, but the names of the attributes are included too:

import maya.OpenMaya as om

list = om.MSelectionList()

node = om.MObject()

list.add("blendShape1")

list.getDependNode(0, node)

dgNode = om.MFnDependencyNode(node)

aliasList = []

dgNode.getAliasList(aliasList)

# Result: [u'pSphere2', u'weight[0]', u'pSphere3', u'weight[1]'] #

 I don't understand the MSelectionList combo, could you explain it please?

Thank you Paul.

[Paul Molodowitch]

Yes, I meant getAliasList.

By the "MSelectionList combo", I simply meant that in order to turn the strings you get back from getAliasList into MObjects - which you can then use to do things with in the api - you need to use MSelectionList.add / MSelectionList.getPlug

It may also be possible to just use MFnDependencyNode.findPlug, instead of MSelectionList... I'm not sure offhand how it handles child/multi attributes.

- Paul

[Miguel González Viñé]

Great, thanks for the explanation.