in flaskr/auth.py [0:0]
def load_logged_in_user():
"""If a user id is stored in the session, load the user object from
the database into ``g.user``."""
user_id = session.get("user_id")
if user_id is None:
g.user = None
else:
g.user = (
get_db().execute("SELECT * FROM user WHERE id = ?", (user_id,)).fetchone()
)