Merge pull request datajoint#907 from guzman-raphael/master

Fix issue with explicit calls to `dj.Connection`

Author: dimitri-yatsenko

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## Release notes
 
+### 0.13.2 -- TBD
+* Bugfix - Explicit calls to `dj.Connection` throw error due to missing `host_input` (#895) PR #907
+
 ### 0.13.1 -- Apr 16, 2021
 * Add `None` as an alias for `IS NULL` comparison in `dict` restrictions (#824) PR #893
 * Drop support for MySQL 5.6 since it has reached EOL PR #893

datajoint/connection.py

@@ -107,8 +107,7 @@ def conn(host=None, user=None, password=None, *, init_fun=None, reset=False, use
                         #encrypted-connection-options).
     """
     if not hasattr(conn, 'connection') or reset:
-        host_input = host if host is not None else config['database.host']
-        host = get_host_hook(host_input)
+        host = host if host is not None else config['database.host']
         user = user if user is not None else config['database.user']
         password = password if password is not None else config['database.password']
         if user is None:  # pragma: no cover
@@ -117,8 +116,7 @@ def conn(host=None, user=None, password=None, *, init_fun=None, reset=False, use
             password = getpass(prompt="Please enter DataJoint password: ")
         init_fun = init_fun if init_fun is not None else config['connection.init_function']
         use_tls = use_tls if use_tls is not None else config['database.use_tls']
-        conn.connection = Connection(host, user, password, None, init_fun, use_tls,
-                                     host_input=host_input)
+        conn.connection = Connection(host, user, password, None, init_fun, use_tls)
     return conn.connection
 
 
@@ -160,8 +158,8 @@ class Connection:
     :param use_tls: TLS encryption option
     """
 
-    def __init__(self, host, user, password, port=None, init_fun=None, use_tls=None,
-                 host_input=None):
+    def __init__(self, host, user, password, port=None, init_fun=None, use_tls=None):
+        host_input, host = (host, get_host_hook(host))
         if ':' in host:
             # the port in the hostname overrides the port argument
             host, port = host.split(':')

docs-parts/intro/Releases_lang1.rst

@@ -1,3 +1,7 @@
+0.13.2 -- TBD
+-------------
+* Bugfix - Explicit calls to `dj.Connection` throw error due to missing `host_input` (#895) PR #907
+
 0.13.1 -- Apr 16, 2021
 ----------------------
 * Add `None` as an alias for `IS NULL` comparison in `dict` restrictions (#824) PR #893

tests/test_connection.py

@@ -17,6 +17,14 @@ def test_dj_conn():
     assert_true(c.is_connected)
 
 
+def test_dj_connection_class():
+    """
+    Should be able to establish a connection
+    """
+    c = dj.Connection(**CONN_INFO)
+    assert_true(c.is_connected)
+
+
 def test_persistent_dj_conn():
     """
     conn() method should provide persistent connection across calls.