Fix for #1407 (to many read books lead to to large sql query) -> only fix for linked calibre-column

cps/helper.py

@@ -824,12 +824,12 @@ def fill_indexpage_with_archived_books(page, database, db_filter, order, allow_s
     else:
         randm = false()
     off = int(int(config.config_books_per_page) * (page - 1))
+    query = db.session.query(database).join(*join, isouter=True).\
+        filter(db_filter).\
+        filter(common_filters(allow_show_archived))
     pagination = Pagination(page, config.config_books_per_page,
-                            len(db.session.query(database).filter(db_filter)
-                                .filter(common_filters(allow_show_archived)).all()))
-    entries = db.session.query(database).join(*join, isouter=True).filter(db_filter)\
-        .filter(common_filters(allow_show_archived))\
-        .order_by(*order).offset(off).limit(config.config_books_per_page).all()
+                            len(query.all()))
+    entries = query.order_by(*order).offset(off).limit(config.config_books_per_page).all()
     for book in entries:
         book = order_authors(book)
     return entries, randm, pagination

cps/web.py

@@ -40,6 +40,7 @@ from flask_login import login_user, logout_user, login_required, current_user
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.sql.expression import text, func, true, false, not_, and_, or_
 from werkzeug.exceptions import default_exceptions
+from sqlalchemy.sql.functions import coalesce
 try:
     from werkzeug.exceptions import FailedDependency
 except ImportError:
@@ -1102,31 +1103,35 @@ def render_read_books(page, are_read, as_xml=False, order=None, *args, **kwargs)
         readBooks = ub.session.query(ub.ReadBook).filter(ub.ReadBook.user_id == int(current_user.id))\
             .filter(ub.ReadBook.read_status == ub.ReadBook.STATUS_FINISHED).all()
         readBookIds = [x.book_id for x in readBooks]
-    else:
-        try:
-            readBooks = db.session.query(db.cc_classes[config.config_read_column]) \
-                .filter(db.cc_classes[config.config_read_column].value == True).all()
-            readBookIds = [x.book for x in readBooks]
-        except KeyError:
-            log.error("Custom Column No.%d is not existing in calibre database", config.config_read_column)
-            readBookIds = []
-
         if are_read:
             db_filter = db.Books.id.in_(readBookIds)
         else:
             db_filter = ~db.Books.id.in_(readBookIds)
-
         entries, random, pagination = fill_indexpage(page, db.Books, db_filter, order)
+    else:
+        try:
+            if are_read:
+                db_filter = db.cc_classes[config.config_read_column].value == True
+            else:
+                db_filter = coalesce(db.cc_classes[config.config_read_column].value, False) != True
+            # book_count = db.session.query(func.count(db.Books.id)).filter(common_filters()).filter(db_filter).scalar()
+            entries, random, pagination = fill_indexpage(page, db.Books,
+                                                         db_filter,
+                                                         order,
+                                                         db.cc_classes[config.config_read_column])
+        except KeyError:
+            log.error("Custom Column No.%d is not existing in calibre database", config.config_read_column)
+            book_count = 0
+
 
     if as_xml:
         return entries, pagination
     else:
         if are_read:
-            name = _(u'Read Books') + ' (' + str(len(readBookIds)) + ')'
+            name = _(u'Read Books') + ' (' + str(pagination.total_count) + ')'
             pagename = "read"
         else:
-            total_books = db.session.query(func.count(db.Books.id)).filter(common_filters()).scalar()
-            name = _(u'Unread Books') + ' (' + str(total_books - len(readBookIds)) + ')'
+            name = _(u'Unread Books') + ' (' + str(pagination.total_count) + ')'
             pagename = "unread"
         return render_title_template('index.html', random=random, entries=entries, pagination=pagination,
                                      title=name, page=pagename)