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[processing] Random points in polygons: fix NULL exp returning 1 #58815

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elpaso
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@elpaso elpaso commented Sep 20, 2024

When POINTS_NUMBER is set to an expression and the expression evaluation returns an invalid value, set the value to 0 instead of 1 (which is logically the min value for the fixed number option).

Fix #58737

When POINTS_NUMBER is set to an expression and the expression
evaluation returns an invalid value, set the value to 0 instead
of 1 (which is logically the min value for the fixed number option).

Fixes qgis#58737
@elpaso elpaso added Processing Relating to QGIS Processing framework or individual Processing algorithms Bug Either a bug report, or a bug fix. Let's hope for the latter! labels Sep 20, 2024
@github-actions github-actions bot added this to the 3.40.0 milestone Sep 20, 2024
@agiudiceandrea
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agiudiceandrea commented Sep 20, 2024

It seems to me just changing:

numberPointsForThisFeature = mNumPointsProperty.valueAsInt( expressionContext, numberPointsForThisFeature );

to

numberPointsForThisFeature = mNumPointsProperty.valueAsInt( expressionContext, 0 );

would fix the issue.

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github-actions bot commented Sep 20, 2024

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit 3df5c79)

@nyalldawson nyalldawson merged commit 78d5e3a into qgis:master Sep 20, 2024
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@agiudiceandrea
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agiudiceandrea commented Sep 21, 2024

Wouldn't it be appropriate to backport to 3.34?

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Random Points in Polygons behaves unexpectedly
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