title: 'Area' object is not callable
body: <p>I have database on Mysql and in project I use pony orm in Flask. I need to get row from database with index 1.</p>
  
  <p>Here I have routes for routing in app</p>
  
  <h2>routes.py</h2>
  
  <pre><code>from app import app
  from pony.orm import *
  from app.models import Area
  
  
  @app.route("/")
  @app.route("/user/")
  @db_session
  def user():
      c = Area[1]
      return c
  </code></pre>
  
  <p>Here I have models for my database</p>
  
  <h2>models.py</h2>
  
  <pre><code>from pony.orm import *
  import config
  
  db = Database()
  
  
  class Country(db.Entity):
      id = PrimaryKey(int,auto=True)
      name = Required(str,100)
      area = Set("Area")
  
  
  class Area(db.Entity):
      id = PrimaryKey(int, auto=True)
      name = Required(str, 100)
      country = Required(Country)
  </code></pre>
  
  <h2>When I open in browser address localhost:8888/ I get next error</h2>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Python34\lib\site-packages\flask\app.py", line 1836, in __call__
      return self.wsgi_app(environ, start_response)
    File "C:\Python34\lib\site-packages\flask\app.py", line 1820, in wsgi_app
      response = self.make_response(self.handle_exception(e))
    File "C:\Python34\lib\site-packages\flask\app.py", line 1403, in handle_exception
      reraise(exc_type, exc_value, tb)
    File "C:\Python34\lib\site-packages\flask\_compat.py", line 33, in reraise
      raise value
    File "C:\Python34\lib\site-packages\flask\app.py", line 1817, in wsgi_app
      response = self.full_dispatch_request()
    File "C:\Python34\lib\site-packages\flask\app.py", line 1478, in full_dispatch_request
      response = self.make_response(rv)
    File "C:\Python34\lib\site-packages\flask\app.py", line 1577, in make_response
      rv = self.response_class.force_type(rv, request.environ)
    File "C:\Python34\lib\site-packages\werkzeug\wrappers.py", line 841, in force_type
      response = BaseResponse(*_run_wsgi_app(response, environ))
    File "C:\Python34\lib\site-packages\werkzeug\wrappers.py", line 57, in _run_wsgi_app
      return _run_wsgi_app(*args)
    File "C:\Python34\lib\site-packages\werkzeug\test.py", line 867, in run_wsgi_app
      app_iter = app(environ, start_response)
  TypeError: 'Area' object is not callable
  </code></pre>
  
  <p>When I made error?</p>