Fixed #36899 -- Implemented SessionBase.__bool__.

Author: aadeina

django/contrib/sessions/backends/base.py

@@ -66,6 +66,9 @@ def __delitem__(self, key):
         del self._session[key]
         self.modified = True
 
+    def __bool__(self):
+        return not self.is_empty()
+
     @property
     def key_salt(self):
         return "django.contrib.sessions." + self.__class__.__qualname__

docs/releases/6.1.txt

@@ -150,7 +150,9 @@ Minor features
 :mod:`django.contrib.sessions`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-* ...
+* :class:`~django.contrib.sessions.backends.base.SessionBase` now supports
+  boolean evaluation via
+  :meth:`~django.contrib.sessions.backends.base.SessionBase.__bool__`.
 
 :mod:`django.contrib.sitemaps`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

docs/topics/http/sessions.txt

@@ -191,6 +191,17 @@ You can edit it multiple times.
 
       Example: ``'fav_color' in request.session``
 
+    .. method:: __bool__()
+
+      .. versionadded:: 6.1
+
+      Returns the inverse of :meth:`is_empty`. This allows checking if a
+      session has data::
+
+          if request.session:
+              # Session has data or a key
+              pass
+
     .. method:: get(key, default=None)
     .. method:: aget(key, default=None)
 

tests/sessions_tests/tests.py

@@ -1373,3 +1373,14 @@ async def test_atest_cookie(self):
 
     def test_is_empty(self):
         self.assertIs(self.session.is_empty(), True)
+
+    def test_bool(self):
+        # Empty session is falsy
+        self.assertIs(bool(self.session), False)
+        # Session with data is truthy
+        self.session["foo"] = "bar"
+        self.assertIs(bool(self.session), True)
+        # Session with key but no data is truthy
+        session_with_key = SessionBase()
+        session_with_key._session_key = "testkey1234"
+        self.assertIs(bool(session_with_key), True)