Method test_exists

test/orm/test_query.py:4353–4369

(self)

    __dialect__ = "default"

    def test_exists(self):
        User = self.classes.User
        sess = fixture_session()

        q1 = sess.query(User)
        self.assert_compile(
            sess.query(q1.exists()),
            "SELECT EXISTS (SELECT 1 FROM users) AS anon_1",
        )

        q2 = sess.query(User).filter(User.name == "fred")
        self.assert_compile(
            sess.query(q2.exists()),
            "SELECT EXISTS ("
            "SELECT 1 FROM users WHERE users.name = :name_1"
            ") AS anon_1",
        )

    def test_exists_col_expression(self):
        User = self.classes.User