better error messages: wrong renderer

[Andreas Janz]

Traceback (most recent call last):
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 903, in wrapper
retval = func(*args, **kwargs)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapboxprocessing\algorithm\classificationperformancesimplealgorithm.py", line 84, in processAlgorithm
result = self.runAlg(alg, parameters, None, feedback2, context, True)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 903, in wrapper
retval = func(*args, **kwargs)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapboxprocessing\enmapalgorithm.py", line 596, in runAlg
return processing.run(algOrName, parameters, onFinish, feedback, context, is_child_algorithm)
File "C:\PROGRA~1/QGIS32~1.2/apps/qgis/./python/plugins\processing\tools\general.py", line 116, in run
return Processing.runAlgorithm(algOrName, parameters, onFinish=post_process, feedback=feedback, context=context)
File "C:\PROGRA~1/QGIS32~1.2/apps/qgis/./python/plugins\processing\core\Processing.py", line 164, in runAlgorithm
ok, msg = alg.checkParameterValues(parameters, context)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 903, in wrapper
retval = func(*args, **kwargs)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapboxprocessing\algorithm\classificationperformancestratifiedalgorithm.py", line 78, in checkParameterValues
self.checkCategories(parameters, context)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 903, in wrapper
retval = func(*args, **kwargs)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapboxprocessing\algorithm\classificationperformancestratifiedalgorithm.py", line 60, in checkCategories
categoriesPrediction = Utils.categoriesFromPalettedRasterRenderer(classification.renderer())
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 902, in wrapper
check_argument_types(memo)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 748, in check_argument_types
raise exc from None
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 746, in check_argument_types
check_type(description, value, expected_type, memo)
File "C:\Users/Gauri/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\site-packages\typeguard\__init__.py", line 668, in check_type
raise TypeError(
TypeError: type of argument "renderer" must be qgis._core.QgsPalettedRasterRenderer; got qgis._core.QgsSingleBandGrayRenderer instead

‌

[Andreas Janz]

Benjamin, this should already be fixed, but I can’t say for sure without the actual data. You may test this yourself to make sure. Either in the GUI or use the unittest below:

def test_error_messages(self):
    alg = ClassificationPerformanceSimpleAlgorithm()
    alg.initAlgorithm()
    parameters = {
        alg.P_CLASSIFICATION: enmap,
        alg.P_REFERENCE: landcover_map_l3,
        alg.P_OPEN_REPORT: False,
        alg.P_OUTPUT_REPORT: c + '/vsimem/report.html',
    }
    try:
        self.runalg(alg, parameters)
    except QgsProcessingException as error:
        self.assertEqual(
            str(error),
            'Unable to execute algorithm\nInvalid classification, requires paletted/unique values renderer (Predicted classification layer)'
        )
    parameters = {
        alg.P_CLASSIFICATION: landcover_map_l3,
        alg.P_REFERENCE: enmap,
        alg.P_OPEN_REPORT: False,
        alg.P_OUTPUT_REPORT: c + '/vsimem/report2.html',
    }
    try:
        self.runalg(alg, parameters)
    except QgsProcessingException as error:
        self.assertEqual(
            str(error),
            'Unable to execute algorithm\nInvalid classification, requires paletted/unique values renderer (Observed categorized layer)'
        )

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