Categorized/graduated symbology does not work for a virtual field computed using a joined column

[qgib]

Author Name: Joseph Liam (Joseph Liam)
Original Redmine Issue: 11545
Affected QGIS version: master
Redmine category:symbology

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Creating a virtual field for a layer and adding up 2 integer fields from that layer works fine. I get the correct results and I can use the virtual field for styling.

However, when doing a Joins with 2 layers and using a virtual field to add up an integer column from each layer, the results displayed are correct. But QGIS does not recognise the values when styling.

When I try to classify this in the Categorized styling option, for example, no data values are recognised.

Strangely, I am able to export the layer, including the virtual field, as a .csv which outputs all the correct results for the virtual field.

Attached are 2 simple point layers: Layer_A is JOINED with Layer_B, the virtual field is created in Layer_A. The virtual field calculates the Grade of both layers by simple addition.

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• Example_Project.zip (Joseph Liam)

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• subject was changed from Cannot use values of Virtual Fields, calculated from JOINED layers, for rendering style to Categorized/graduated symbology does not work for a virtual field computed using a joined column
• os_version was changed from 7 Professional to
• operating_system was changed from Windows to
• fixed_version_id was changed from Version 2.6 to Version 2.8
• version was changed from 2.6.0 to master

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from Version 2.8 to Version 2.8.2

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• fixed_version_id was changed from Version 2.8.2 to Future Release - High Priority

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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Fixed in changeset "fa89e292cef8798cf11b3800aec88b3c4e53cde8".

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• status_id was changed from Open to Closed