professor_test.py

import rmc.models as m
import rmc.test.lib as testlib


def gen_professor(**kwargs):
    attrs = dict({
        'id': 'meredith_swift',  # I'm a cat meow meow!!!!
        'first_name': 'Meredith',
        'last_name': 'Swift',
    }, **kwargs)

    return m.Professor(**attrs)


class ProfessorTest(testlib.ModelTestCase):
    def test_save_ratings(self):
        prof_meredith = gen_professor()

        # Taylor approves of her new roommate, professor Meredith.
        prof_meredith.passion.update_aggregate_after_replacement(None, 1)
        prof_meredith.save()

        # But Meredith exhibits bad posture, so Taylor retracts her old rating.
        prof_meredith.passion.update_aggregate_after_replacement(1, None)
        prof_meredith.save()

        # Now we are internally in an inconsistent state, but the fault has not
        # propagated to the user as an error yet.

        # Meredith learns how to moves her ears on command and Taylor is happy.
        prof_meredith.passion.update_aggregate_after_replacement(None, 1)
        prof_meredith.save()

        # But Ed is dejected after Meredith gives him a look of disapproval.
        prof_meredith.passion.update_aggregate_after_replacement(None, 0)
        prof_meredith.save()

        # Meredith meowed on about how Taylor can't sing, which Taylor thought
        # was mean, so she changed her old approval to a disapproval.
        prof_meredith.passion.update_aggregate_after_replacement(1, 0)

        # Now the fault gets manifested into an exception.
        prof_meredith.save()
        
        # At this point we get:
        # ValidationError: ValidationError(rating.Float value is too small: ['passion'])

Running this will produce the following output:

[ rmc ] (master) PYTHONPATH=.. nosetests models/professor_test.py
F
======================================================================
FAIL: test_save_ratings (rmc.models.professor_test.ProfessorTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/david/redccnt/code/rmc/models/professor_test.py", line 43, in test_save_ratings
    prof_meredith.save()
  File "/Users/david/redccnt/code/rmc/models/professor.py", line 73, in save
    super(Professor, self).save(*args, **kwargs)
  File "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mongoengine/document.py", line 208, in save
    self.validate()
  File "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mongoengine/base.py", line 1025, in validate
    raise ValidationError('ValidationError', errors=errors)
ValidationError: ValidationError(rating.Float value is too small: ['passion'])