Add the ability to sort the library view by a specific named column (field). Useful for sorting by fields that are not visible.

src/calibre/gui2/library/models.py

@@ -314,6 +314,13 @@ class BooksModel(QAbstractTableModel): # {{{
         if not isinstance(order, bool):
             order = order == Qt.AscendingOrder
         label = self.column_map[col]
+        self._sort(label, order, reset)
+
+    def sort_by_named_column(self, field, order, reset=True):
+        if field in self.db.field_metadata.keys():
+            self._sort(field, order, reset)
+
+    def _sort(self, label, order, reset):
         self.db.sort(label, order)
         if reset:
             self.reset()

src/calibre/gui2/library/views.py

@@ -236,6 +236,16 @@ class BooksView(QTableView): # {{{
                 sm.select(idx, sm.Select|sm.Rows)
             self.scroll_to_row(indices[0].row())
         self.selected_ids = []
+
+    def sort_by_named_column(self, field, order, reset=True):
+        if field in self.column_map:
+            idx = self.column_map.index(field)
+            if order:
+                self.sortByColumn(idx, Qt.AscendingOrder)
+            else:
+                self.sortByColumn(idx, Qt.DescendingOrder)
+        else:
+            self._model.sort_by_named_column(field, order, reset)
     # }}}
 
     # Ondevice column {{{