[bugfix][server] Respect relations in getfeatureinfo

Fixes #18518

QGIS Server 3 GetFeatureInfo doesn't resolve value relations anymore

Author: elpaso

python/core/auto_generated/qgsproject.sip.in

@@ -46,6 +46,7 @@ Most of the time you want to use QgsProject.instance() instead as many component
 
     ~QgsProject();
 
+
     void setTitle( const QString &title );
 %Docstring
 Sets the project's title.

src/core/qgsproject.cpp

@@ -382,6 +382,11 @@ QgsProject::~QgsProject()
   }
 }
 
+void QgsProject::setInstance( QgsProject *project )
+{
+  sProject = project;
+}
+
 
 QgsProject *QgsProject::instance()
 {

src/core/qgsproject.h

@@ -109,6 +109,18 @@ class CORE_EXPORT QgsProject : public QObject, public QgsExpressionContextGenera
 
     ~QgsProject() override;
 
+#ifndef SIP_RUN
+
+    /**
+     * Set the current project instance to \a project
+     *
+     * \note this is used mainly by the server, which caches the projects and (potentially) needs to switch the current instance on every request
+     * \see instance()
+     * \since QGIS 3.2
+     */
+    static void setInstance( QgsProject *project );
+#endif
+
     /**
      * Sets the project's title.
      * \param title new title

src/server/qgsconfigcache.cpp

@@ -48,7 +48,7 @@ const QgsProject *QgsConfigCache::project( const QString &path )
       mFileSystemWatcher.addPath( path );
     }
   }
-
+  QgsProject::setInstance( mProjectCache[ path ] );
   return mProjectCache[ path ];
 }
 

tests/src/python/test_qgsserver_wms_getfeatureinfo.py

@@ -286,6 +286,19 @@ def testGetFeatureInfoFilter(self):
                                  'FEATURE_COUNT=10&FILTER=testlayer%20%C3%A8%C3%A9' + urllib.parse.quote(':"NAME" = \'two\''),
                                  'wms_getfeatureinfo_filter_no_width')
 
+    def test_value_relation(self):
+        """Test wether value relations are resolved: regression 18518"""
+        self.wms_request_compare('GetFeatureInfo',
+                                 '&BBOX=537912.30469845747575164,4975501.92125043831765652,577227.89428471261635423,4996610.36656293831765652' +
+                                 '&CRS=EPSG:32632' +
+                                 '&WIDTH=1328&HEIGHT=713' +
+                                 '&LAYERS=test_multi' +
+                                 '&STYLES=&FORMAT=image/jpeg' +
+                                 '&QUERY_LAYERS=test_multi&INFO_FORMAT=text/xml' +
+                                 '&I=429&J=528&FEATURE_COUNT=10',
+                                 'wms_getfeatureinfo_value_relation',
+                                 project='test_project_value_relation.qgz')
+
 
 if __name__ == '__main__':
     unittest.main()