You would like to perform some tests to ensure that you can insert and query for objects.
Insertions work, but when you try to perform a query in your tests you get a problem like this:
Failed example:
len(MyObject.query.all())
Exception raised:
Traceback (most recent call last):
File ".../lib/python2.6/doctest.py", line 1248, in __run
compileflags, 1) in test.globs
File "<doctest myapp.MyObject[4]>", line 1, in <module>
len(MyObject.query.all())
AttributeError: 'NoneType' object has no attribute 'all'
What you need to do is ensure that you have initialized a request context for your tests. This can be done by:
app.test_request_context().push()
Now when you run your tests and query them they should work.
This snippet by csaunders can be used freely for anything you like. Consider it public domain.