Add custom cols to the content server active link code. In the process, fix a problem where grouped search term user categories were not in the content server's field_metadata.

src/calibre/gui2/tag_view.py

@@ -7,6 +7,8 @@ __docformat__ = 'restructuredtext en'
 Browsing book collection by tags.
 '''
 
+import traceback
+
 from itertools import izip
 from functools import partial
 
@@ -755,13 +757,15 @@ class TagsModel(QAbstractItemModel): # {{{
             try:
                 tb_cats.add_user_category(label=cat_name, name=user_cat)
             except ValueError:
-                import traceback
                 traceback.print_exc()
 
-        for cat in sorted(self.db.prefs.get('grouped_search_terms', {}),
+        for cat in sorted(self.db.prefs.get('grouped_search_terms', {}).keys(),
                           key=sort_key):
             if (u'@' + cat) in data:
-                tb_cats.add_user_category(label=u'@' + cat, name=cat)
+                try:
+                    tb_cats.add_user_category(label=u'@' + cat, name=cat)
+                except ValueError:
+                    traceback.print_exc()
         self.db.data.change_search_locations(self.db.field_metadata.get_search_terms())
 
         if len(saved_searches().names()):

src/calibre/library/database2.py

@@ -353,12 +353,23 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
         # Reconstruct the user categories, putting them into field_metadata
         # Assumption is that someone else will fix them if they change.
         self.field_metadata.remove_dynamic_categories()
-        tb_cats = self.field_metadata
         for user_cat in sorted(self.prefs.get('user_categories', {}).keys(), key=sort_key):
             cat_name = '@' + user_cat # add the '@' to avoid name collision
-            tb_cats.add_user_category(label=cat_name, name=user_cat)
+            self.field_metadata.add_user_category(label=cat_name, name=user_cat)
+
+        # add grouped search term user categories
+        muc = self.prefs.get('grouped_search_make_user_categories', [])
+        for cat in sorted(self.prefs.get('grouped_search_terms', {}).keys(), key=sort_key):
+            if cat in muc:
+                # There is a chance that these can be duplicates of an existing
+                # user category. Print the exception and continue.
+                try:
+                    self.field_metadata.add_user_category(label=u'@' + cat, name=cat)
+                except:
+                    traceback.print_exc()
+
         if len(saved_searches().names()):
-            tb_cats.add_search_category(label='search', name=_('Searches'))
+            self.field_metadata.add_search_category(label='search', name=_('Searches'))
 
         self.field_metadata.add_grouped_search_terms(
                                     self.prefs.get('grouped_search_terms', {}))

src/calibre/library/server/browse.py

@@ -603,7 +603,9 @@ class BrowseServer(object):
                 val = ''
             if add_category_links:
                 added_key = False
-                if val and key in ('authors', 'publisher', 'series', 'tags'):
+                fm = mi.metadata_for_field(key)
+                if val and fm and fm['is_category'] and \
+                        key != 'formats' and fm['datatype'] not in ['rating']:
                     categories = mi.get(key)
                     if isinstance(categories, basestring):
                         categories = [categories]