Revert "Use member variable `self.conn` to avoid test failure"

This reverts commit 4fafdfd8487ddf61105b2a5ca92534c8014c1db4.

While using `self.conn.cursor()` works in the tests, it will not work
in the application since the point of initialisation could be very
different from the point where the 'property' is called.

1 files changed, 1 insertions, 1 deletions

diff --git a/wqflask/base/species.py b/wqflask/base/species.py
index 403e0bbb..0ee04630 100644
--- a/wqflask/base/species.py
+++ b/wqflask/base/species.py
@@ -47,7 +47,7 @@ class Chromosomes:
     def chromosomes(self) -> OrderedDict:
         """Lazily fetch the chromosomes"""
         chromosomes = OrderedDict()
-        with self.conn.cursor() as cursor:
+        with database_connection() as conn, conn.cursor() as cursor:
             if self.species is not None:
                 cursor.execute(
                     "SELECT Chr_Length.Name, Chr_Length.OrderId, Length "