[DaltonST]

You misunderstand.

It is trivial to refresh the Library View from the Cache, but only if the Cache itself has just been refreshed from metadata.db.

I was reloading the book ids from the physical SQLite database into the Cache by using the "refreshdb:" IPC message that no longer exists in Calibre 5.7.

Hard-drive to Cache, not Cache to GUI Library View.


Added: History: I began to use IPC to refresh the Cache after you deprecated using "calibredb --add-books" while the current Calibre Library GUI was running. It was so easy with "calibredb --add-books".





I will try this next:

class ResultCache(SearchQueryParser):

    def refresh_ids(self, db, ids):
        '''
        Refresh the data in the cache for books identified by ids.
        Returns a list of affected rows or None if the rows are filtered.
        '''
        for id in ids:
            try:
                self._data[id] = CacheRow(db, self.composites, self.datetimes,
                        db.conn.get('SELECT * from meta2 WHERE id=?', (id,))[0],
                        self.series_col, self.series_sort_col)
                self._data[id].append(db.book_on_device_string(id))
                self._data[id].append(self.marked_ids_dict.get(id, None))
                self._data[id].append(None)
                self._uuid_map[self._data[id][self._uuid_column_index]] = id
            except IndexError:
                return None
        try:
            return list(map(self.row, ids))
        except ValueError:
            pass
        return None