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Does anyone know the error that a graphical model can not be run at all?

Following procedure:

  1. Go to "Browser" in QGIS.
  2. Execute *.model3.
  3. Do the necessary stuff like input file and output file.
  4. Click on "Run".

There is no error, nothing in "Log" and no output file. An input file from the local hard disk did not change anything. It affects not only one model, but several. A colleague also tested it, there all models worked.

enter image description here

Mona
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  • Have you made sure the model actually works? What should the model do? What input data do you have? – Erik Jul 21 '21 at 12:48
  • Thank you, I added some information. – Mona Jul 22 '21 at 13:36
  • Have you tried building a simple model and running it? E.g. one for reprojecting a shape file. – Erik Jul 22 '21 at 13:42
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    Yes, I tried a simple model (just with a buffer) and found out the following:
    • Case 1: Right click at the model via QGIS browser: "edit model"; then no editing, but "start" the model (green arrow) -> result: model was executed
    • Case 2: Right click at the model via QGIS browser: "run model"; then "start" the model -> result: nothing happens

    Looks like a bug to me, doesn't it?

     – Mona Aug 23 '21 at 10:04
  • I think I now know, what you're talking about: Models simply do not run, when you drag&drop them into QGIS - they only run when started from the QGIS modeller. Did you observe this behaviour? So yes, this most likely is a bug. – Erik Aug 23 '21 at 10:05
  • No, I didn't drag&drop it into QGIS. I navigated to the model via browser (in the german QGIS the widget is called "browser"). In the content menu of the model are the both options "edit model" and "run model". – Mona Aug 23 '21 at 10:10
  • Yeah, but I think drag&drop and running from the browser work similarly. I'll open a bug report/check whether one exists. – Erik Aug 23 '21 at 11:01
  • Thank you for your answer and bug reporting! Then my suggestion would be to remove the option "run model" from the content menu of the browser as long as the bug exists. – Mona Aug 23 '21 at 11:28
  • https://github.com/qgis/QGIS/issues/44824 - bug report – Erik Aug 24 '21 at 10:16

2 Answers2

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This was a bug in QGIS which was resolved with https://github.com/qgis/QGIS/pull/43716.

It should now work with the latest QGIS LR / LTR releases (curently 3.20.2 / 3.16.10).

pathmapper
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So, it seems to be a bug: Nothing happens, when right clicking at the model via QGIS browser: "run model" and then start the model. It is probably related to the bug, that models simply do not run, when you drag&drop them into QGIS. Workaround: Right click at the model via QGIS browser: "edit model"; then no editing, but "start" the model with the green arrow.

Mona
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