title: flask sqlalchemy check if object exist in db
body: <p>I have a Flask application which uses Flask-SQLAlchemy to connect to a database.</p>
  
  <p>I need to check if row with <code>name='reza'</code> exists...</p>
  
  <p>I think I can use <code>Any()</code>, <code>Exists()</code>.</p>