[Interest] I feel stupid: QStandardItem::insertRows: Ignoring duplicate insertion of item

[Frank Rueter | OHUfx]

You are dead right as my follow up email confirms.
Now the question is how to use the same (parented) item in a tree view 
and a list view.
I guess I will be RTFM-ing a bit.

Cheers,
frank


On 26/04/17 9:24 PM, Kevin Funk wrote:
> On Wednesday, 26 April 2017 19:50:54 CEST Frank Rueter | OHUfx wrote:
>> Hi,
>>
>> I seem to run into this issue a lot and I don't get why:
>> I have a list of sub-classed QStandardItems that another processor
>> generated, and I want to add them to a QStandardItemModel like this:
>>
>> for item in myItemList:
>>       self.model.appendRow(item)
>>
>> The model is empty and hasn't been used at this point. Yet I get none of
>> my items but one of those errors for each item:
>>       QStandardItem::insertRows: Ignoring duplicate insertion of item
> Use the source, Luke :)
>
> QStandardItemModel::appendRow calls
> - QStandardItem::appendRow which calls
> - QStandardItem::insertRow which calls
> - QStandardItemPrivate::insertRows [1]
>
> Excerpt from QStandardItemPrivate::insertRows:
> ```
> //...
> if (item->d_func()->parent == 0) {
>      item->d_func()->setParentAndModel(q, model);
> } else {
>      qWarning("QStandardItem::insertRows: Ignoring duplicate insertion of item
> %p",
>               item);
>      item = 0;
> }
> //...
> ```
>
> => The warning is thrown when your items already have a parent set
>
> Is that the case for you?
>
> Hope that helps,
> Kevin
>
> PS: The Woboq code browser is an awesome tool to follow call chains (or any
> decent IDE will do, if you have the Qt sources)
>
> [1] https://code.woboq.org/qt5/qtbase/src/gui/itemmodels/
> qstandarditemmodel.cpp.html#_ZN20QStandardItemPrivate10insertRowsEiiRK5QListIP13QStandardItemE
>> I know I should know this but I can't figure out why this is happening.
>> Is there something special I need to do when subclassing QStandardItem?
>>
>>
>> Cheers,
>> frank
>