StefanE StefanE - 2 months ago 27
Python Question

Flask view raises TypeError: 'bool' object is not callable

I am trying to debug a view in my Flask app that is return a 500 status with the error

TypeError: 'bool' object is not callable
in the traceback. The view calls
login_user
from Flask-Login then returns
True
to indicate that the login was successful.

I have debugged until
app_iter = app(environ, start_response)
and the
app
is now a boolean with the value
True
rather than the Flask app object.

Traceback (most recent call last):
File "D:\Python27\lib\site-packages\flask\app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "D:\Python27\lib\site-packages\flask\app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "D:\Python27\lib\site-packages\flask\app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "D:\Python27\lib\site-packages\flask\app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "D:\Python27\lib\site-packages\flask\app.py", line 1478, in full_dispatch_request
response = self.make_response(rv)
File "D:\Python27\lib\site-packages\flask\app.py", line 1577, in make_response
rv = self.response_class.force_type(rv, request.environ)
File "D:\Python27\lib\site-packages\werkzeug\wrappers.py", line 824, in force_type
response = BaseResponse(*_run_wsgi_app(response, environ))
File "D:\Python27\lib\site-packages\werkzeug\wrappers.py", line 57, in _run_wsgi_app
return _run_wsgi_app(*args)
File "D:\Python27\lib\site-packages\werkzeug\test.py", line 854, in run_wsgi_app
app_iter = app(environ, start_response)
TypeError: 'bool' object is not callable




@app.route('/login', methods=['POST'])
def login():
username = request.form['username']
user = User.query.filter_by(username=username).first()

if user:
login_user(user)
return True

return False

Answer

In Flask, a view must return one of the following:

  • a string
  • a Response object (or subclass)
  • a tuple of (string, status, headers) or (string, status)
  • a valid WSGI application

Flask tests for the first 3 options, and if they don't fit, assumes it is the fourth. You returned True somewhere, and it is being treated as a WSGI application instead.

See About Responses in the documentation.