db manager: show error message in bar when adding a layer fails (fixes #8148)

Author: jef-n

python/plugins/db_manager/db_model.py

@@ -542,7 +542,7 @@ def importLayer(self, layerType, providerKey, layerName, uriString, parent):
 
 		if not inLayer.isValid():
 			# invalid layer
-			QMessageBox.warning(None, self.tr("Invalid layer"), self.tr("Unable to load the layer %s") % inLayer.name)
+			QMessageBox.warning(None, self.tr("Invalid layer"), self.tr("Unable to load the layer %s") % inLayer.name())
 			return False
 
 		# retrieve information about the new table's db and schema

python/plugins/db_manager/db_tree.py

@@ -23,7 +23,8 @@
 from PyQt4.QtCore import *
 from PyQt4.QtGui import *
 
-from qgis.core import QgsMapLayerRegistry
+from qgis.core import QgsMapLayerRegistry, QgsMessageLog
+from qgis.gui import QgsMessageBar, QgsMessageBarItem
 
 from .db_model import DBModel
 from .db_plugins.plugin import DBPlugin, Schema, Table
@@ -140,10 +141,19 @@ def delete(self):
   def addLayer(self):
     table = self.currentTable()
     if table is not None:
-      QgsMapLayerRegistry.instance().addMapLayers([table.toMapLayer()])
+      layer = table.toMapLayer()
+      layers = QgsMapLayerRegistry.instance().addMapLayers([layer])
+      if len(layers)<>1:
+        QgsMessageLog.instance().logMessage( self.tr( "%1 is an invalid layer - not loaded" ).replace( "%1", layer.publicSource() ) )
+        msgLabel = QLabel( self.tr( "%1 is an invalid layer and cannot be loaded. Please check the <a href=\"#messageLog\">message log</a> for further info." ).replace( "%1", layer.publicSource() ), self.mainWindow.infoBar )
+        msgLabel.setWordWrap( True )
+        self.connect( msgLabel, SIGNAL("linkActivated( QString )" ),
+                      self.mainWindow.iface.mainWindow().findChild( QWidget, "MessageLog" ), SLOT( "show()" ) )
+        self.connect( msgLabel, SIGNAL("linkActivated( QString )" ),
+                      self.mainWindow.iface.mainWindow(), SLOT( "raise()" ) )
+        self.mainWindow.infoBar.pushItem( QgsMessageBarItem( msgLabel, QgsMessageBar.WARNING ) )
 
   def reconnect(self):
     db = self.currentDatabase()
     if db is not None:
       self.mainWindow.invokeCallback(db.reconnectActionSlot)
-