Change .star to .__star__

Fixes #2796

CHANGELOG.md

@@ -7,6 +7,9 @@ https://github.com/coleifer/peewee/releases
 
 ## master
 
+* The new `star` attribute was causing issues for users who had a field named
+  star on their models. This attribute is now renamed to `__star__`. #2796.
+
 [View commits](https://github.com/coleifer/peewee/compare/3.17.0...master)
 
 ## 3.17.0

peewee.py

@@ -797,7 +797,7 @@ def select(self, *columns):
         return Select((self,), columns)
 
     @property
-    def star(self):
+    def __star__(self):
         return NodeList((QualifiedNames(self), SQL('.*')), glue='')
 
     def join(self, dest, join_type=JOIN.INNER, on=None):

tests/sql.py

@@ -170,19 +170,19 @@ def test_subquery_in_select_expression_sql(self):
             'ORDER BY "t1"."x", "t1"."y"'), [])
 
     def test_star(self):
-        query = User.select(User.star)
+        query = User.select(User.__star__)
         self.assertSQL(query, ('SELECT "t1".* FROM "users" AS "t1"'), [])
 
         query = (Tweet
-                 .select(Tweet.star, User.star)
+                 .select(Tweet.__star__, User.__star__)
                  .join(User, on=(Tweet.c.user_id == User.c.id)))
         self.assertSQL(query, (
             'SELECT "t1".*, "t2".* '
             'FROM "tweets" AS "t1" '
             'INNER JOIN "users" AS "t2" ON ("t1"."user_id" = "t2"."id")'), [])
 
         query = (Tweet
-                 .select(Tweet.star, User.c.id)
+                 .select(Tweet.__star__, User.c.id)
                  .join(User, on=(Tweet.c.user_id == User.c.id)))
         self.assertSQL(query, (
             'SELECT "t1".*, "t2"."id" '