Issues with treeview and selections

[kiteh]

Hi all, I am having some issues with QTreeView where I populates the information from another model.

While trying to perform the selection within the tree view, it is suppose to be returning me the full path of the selection. However for some reasons, there is always a 'NoneType' object/ something in which it will returns me 2 items - the selection and a None.

For example, if I have the following tree:

* ObjectA
** ObjectB
*** ObjectC

# And selected ObjectC, the full path should be - |ObjectA|ObjecBA|ObjectC but instead I got |None|ObjectA|ObjecBA|ObjectC

One way that I have rectified this problem is using `try... except <either Attribute or TypeError>` in the selectionChanged connection for the tree view and for the displaying of data in the model where it checks if the role equates to `QtCore.Qt.DisplayRole`.

About the latter - Correct me if I am wrong, but doesn't QtCore.Qt.DisplayRole valid only if there are characters/strings in the field? If so, it should not be deriving the empty values, right?

This is the script - https://pastebin.com/xTavZfhP

(I apologize in advance that the code may not work on a typical maya scene for some portions within are custom stuff used. Also I have listed out the error portions, search using #>>>)

Appreciate for any insights!

[Justin Israel]

On Thu, Sep 13, 2018, 10:23 AM kiteh <kiteh...@gmail.com> wrote:

Hi all, I am having some issues with QTreeView where I populates the information from another model.

While trying to perform the selection within the tree view, it is suppose to be returning me the full path of the selection. However for some reasons, there is always a 'NoneType' object/ something in which it will returns me 2 items - the selection and a None.

For example, if I have the following tree:

* ObjectA
** ObjectB
*** ObjectC

# And selected ObjectC, the full path should be - |ObjectA|ObjecBA|ObjectC but instead I got |None|ObjectA|ObjecBA|ObjectC

One way that I have rectified this problem is using `try... except <either Attribute or TypeError>` in the selectionChanged connection for the tree view and for the displaying of data in the model where it checks if the role equates to `QtCore.Qt.DisplayRole`.

About the latter - Correct me if I am wrong, but doesn't QtCore.Qt.DisplayRole valid only if there are characters/strings in the field? If so, it should not be deriving the empty values, right?

That isn't correct. It's just data like anything else. But it is used as the display value. If your node returns None for its DisplayRole then it could get converted to a string. 

This is the script - https://pastebin.com/xTavZfhP

(I apologize in advance that the code may not work on a typical maya scene for some portions within are custom stuff used. Also I have listed out the error portions, search using #>>>)

Looks like your issue is related to this spot:

@property
def name(self):
    return self._node.key()

I don't know what type your node is but if key() is returning None, then that is what you are getting in your model for the display role. 

Make sure you are also accounting for your root node. It should be an empty string for the name? Maybe what you need to do is:

@property
def name(self):
    return self._node.key() or '' 

Appreciate for any insights!

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[kiteh]

Thanks, I will take a look!