QGIS server rule based rendering based on joined layers results in "End of script output before headers: qgis_mapserv.fcgi"

[qgib]

Author Name: Tudor Bărăscu (@tudorbarascu)
Original Redmine Issue: 12307
Affected QGIS version: 2.8.1
Redmine category:qgis_server
Assignee: Marco Hugentobler

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I have chased this issue for several days.
Having a project with joined layers and I want to use rule based styling; If I encompass any of the joined layers in the filter, the following error appears in QGIS Server.

In QGIS Desktop everything is working fine.
@
mod_fcgid: error reading data, FastCGI server closed connection, referer: http://..
qgis_mapserv.fcgi, referer: http://...
@

[qgib]

Author Name: Tudor Bărăscu (@tudorbarascu)

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Tested also on Ubuntu Trusty and the same error appears in QGIS Server.

Also, I just noticed that the problems appears only when there are at least 2 joined layers.

For just one joined layer, everything works ok: styling with filtering based on a joined layer column works, data defined properties based on joined layer column also work etc.

As soon as I add a second joined layer:

a) if using rule based styling based on any column of any joined layer the features don't show up at all

b) if using data defined properties based on any column of any joined layer in any symbology type (single symbol, categorized, graduated etc.), the features do get drawn but they ignore any logic from data defined properies.

All this, without adding another filter from the second joined layer. Just adding the second join layer the server doesn't work properly.

Basically, the outcome of the issue is that features are not rendered at all in QGIS server, or they are rendered improperly.

All the best

[qgib]

Author Name: Giovanni Manghi (@gioman)

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For just one joined layer, everything works ok: styling with filtering based on a joined layer column works, data defined properties based on joined layer column also work etc.

As soon as I add a second joined layer, the filtering doesn't work anymore, data defined properties based on any column of any joined layer doesn't work. All this, without adding any filter from the second joined layer. Just a simple join layer.

Also, I noticed the issue appears in data-defined-properties for every styling mode (single symbol, categorized, graduated etc.).

all this is on qgis desktop or server? on the desktop I joined a layer with two csv tables and filtering (in rule based renderer) and data defined symbology seems to work ok here.

Why you tagged this as blocker? in a previous qgis release in the same conditions it was working as expected?

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• status_id was changed from Open to Feedback

[qgib]

Author Name: René-Luc ReLuc (@rldhont)

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It's a regression affected QGIS Server.

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• assigned_to_id was configured as Marco Hugentobler

[qgib]

Author Name: Tudor Bărăscu (@tudorbarascu)

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In Desktop everything works as it should.
Only in the server the problem arises.
From your questions I am now understanding that blocker should only be when it was working before.
I tested with QGIS 2.4 on Ubuntu 12.04 and issue is present.
I am using postgis layers.
All the best

[qgib]

Author Name: Denis Rouzaud (@3nids)

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• status_id was changed from Feedback to Open
• priority_id was changed from Severe/Regression to High

[qgib]

Author Name: Marco Hugentobler (@mhugent)

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Should be fixed

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• status_id was changed from Open to Closed

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• resolution was changed from to fixed/implemented