Fix to make deletion of postgres columns working again

git-svn-id: http://svn.osgeo.org/qgis/trunk@7063 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/app/qgsattributetable.cpp

@@ -356,9 +356,7 @@ void QgsAttributeTable::deleteAttribute(const QString& name)
     }
     else
     {
-	QgsDebugMsg("QgsAttributeTable: deleteAttribute " + name);
-  
-  // TODO: [MD] mDeletedAttributes.insert(name);
+	mDeletedAttributes.insert(name); 
 	removeAttrColumn(name);
     }
     mEdited=true;

src/app/qgsattributetable.h

@@ -130,7 +130,7 @@ class QgsAttributeTable:public Q3Table
       and the value the attribute type*/
     QgsNewAttributesMap mAddedAttributes;
     /**Set containing the attribute names of deleted attributes*/
-    QgsFeatureIds mDeletedAttributes;
+    QgsDeletedAttributesSet mDeletedAttributes;
     /**Nested map containing the changed attribute values. The int is the feature id, 
       the first QString the attribute name and the second QString the new value*/
     QgsChangedAttributesMap mChangedValues;

src/core/qgsvectordataprovider.cpp

@@ -82,7 +82,7 @@ bool QgsVectorDataProvider::addAttributes(const QgsNewAttributesMap & attributes
   return false;
 }
 
-bool QgsVectorDataProvider::deleteAttributes(const QgsAttributeIds & attributes)
+bool QgsVectorDataProvider::deleteAttributes(const QgsAttributeIds& attributes)
 {
   return false;
 }
@@ -220,15 +220,13 @@ QString QgsVectorDataProvider::capabilitiesString() const
 int QgsVectorDataProvider::indexFromFieldName(const QString& fieldName) const
 {
   const QgsFieldMap& theFields = fields();
-  int counter = 0;
 
   for (QgsFieldMap::const_iterator it = theFields.begin(); it != theFields.end(); ++it)
   {
     if(it->name() == fieldName)
     {
-      return counter;
+      return it.key();
     }
-    ++counter;
   }
   return -1;
 }

src/core/qgsvectordataprovider.h

@@ -190,10 +190,10 @@ class CORE_EXPORT QgsVectorDataProvider : public QgsDataProvider
 
       /**
        * Deletes existing attributes
-       * @param attributes a set containing indexes of attributes
+       * @param attributes a set containing names of attributes
        * @return true in case of success and false in case of failure
        */
-      virtual bool deleteAttributes(const QgsAttributeIds & attributes);
+      virtual bool deleteAttributes(const QgsAttributeIds& attributes);
 
       /**
        * Changes attribute values of existing features.

src/core/qgsvectorlayer.cpp

@@ -2878,27 +2878,36 @@ void QgsVectorLayer::setCoordinateSystem()
 
 }
 
-bool QgsVectorLayer::commitAttributeChanges(const QgsAttributeIds& deleted,
+bool QgsVectorLayer::commitAttributeChanges(const QgsDeletedAttributesSet& deleted,
                             const QgsNewAttributesMap& added,
                             const QgsChangedAttributesMap& changed)
 {
   bool returnvalue=true;
 
   if(mDataProvider)
   {
+
+    QgsAttributeIds attIds;
+    QgsDeletedAttributesSet::const_iterator att_it = deleted.constBegin();
+
+    for(; att_it != deleted.constEnd(); ++att_it)
+      {
+	attIds.insert(mDataProvider->indexFromFieldName(*att_it));
+      }
+
     if(mDataProvider->capabilities()&QgsVectorDataProvider::DeleteAttributes)
     {
       //delete attributes in all not commited features
       for (QgsFeatureList::iterator iter = mAddedFeatures.begin(); iter != mAddedFeatures.end(); ++iter)
       {
-        for (QgsAttributeIds::const_iterator it = deleted.begin(); it != deleted.end(); ++it)
+        for (QgsAttributeIds::const_iterator it = attIds.begin(); it != attIds.end(); ++it)
         {
           (*iter).deleteAttribute(*it);
         }
       }
 
       //and then in the provider
-      if(!mDataProvider->deleteAttributes(deleted))
+      if(!mDataProvider->deleteAttributes(attIds))
       {
         returnvalue=false;
       }

src/core/qgsvectorlayer.h

@@ -56,6 +56,8 @@ typedef QSet<int> QgsAttributeIds;
 // key = attribute name, value = attribute type
 typedef QMap<QString, QString> QgsNewAttributesMap;
 
+typedef QSet<QString> QgsDeletedAttributesSet;
+
 typedef QMap<int, QgsField> QgsFieldMap;
 
 
@@ -314,7 +316,7 @@ existing rings, 5 no feature found where ring can be inserted*/
                       of attribute values to change
 
    */
-  bool commitAttributeChanges(const QgsAttributeIds& deleted,
+  bool commitAttributeChanges(const QgsDeletedAttributesSet& deleted,
                               const QgsNewAttributesMap& added,
                               const QgsChangedAttributesMap& changed);
 

src/providers/postgres/qgspostgresprovider.cpp

@@ -1768,17 +1768,21 @@ bool QgsPostgresProvider::addAttributes(const QgsNewAttributesMap & name)
   return returnvalue;
 }
 
-bool QgsPostgresProvider::deleteAttributes(const QgsAttributeIds& name)
+bool QgsPostgresProvider::deleteAttributes(const QgsAttributeIds& ids)
 {
   bool returnvalue=true;
   PQexec(connection,"BEGIN");
-  for(QgsAttributeIds::const_iterator iter=name.begin();iter!=name.end();++iter)
+
+  for(QgsAttributeIds::const_iterator iter=ids.begin();iter != ids.end();++iter)
   {
-    QString column = attributeFields[*iter].name();
+    QgsFieldMap::const_iterator field_it = attributeFields.find(*iter);
+    if(field_it == attributeFields.constEnd())
+      {
+	continue;
+      }
+    QString column = field_it->name();
     QString sql="ALTER TABLE "+mSchemaTableName+" DROP COLUMN "+column;
 
-    QgsDebugMsg(sql);
-    
     //send sql statement and do error handling
     PGresult* result=PQexec(connection, (const char *)(sql.utf8()));
     if(result==0)