class ModelMixinCallStckMngr(CallStackMixin, models.Model):
"""
Test Model class which uses both CallStackManager, and CallStackMixin
"""
# override Manager objects
objects = CallStackManager()
id_field = models.IntegerField()
class StudentModuleHistory(CallStackMixin, models.Model):
"""Keeps a complete history of state changes for a given XModule for a given
Student. Right now, we restrict this to problems so that the table doesn't
explode in size."""
objects = CallStackManager()
HISTORY_SAVING_TYPES = {'problem'}
class Meta(object):
app_label = "courseware"
get_latest_by = "created"
student_module = models.ForeignKey(StudentModule, db_index=True)
version = models.CharField(max_length=255,
null=True,
blank=True,
db_index=True)
# This should be populated from the modified field in StudentModule
created = models.DateTimeField(db_index=True)
state = models.TextField(null=True, blank=True)
grade = models.FloatField(null=True, blank=True)
max_grade = models.FloatField(null=True, blank=True)
@receiver(post_save, sender=StudentModule)
def save_history(sender, instance, **kwargs): # pylint: disable=no-self-argument, unused-argument
"""
Checks the instance's module_type, and creates & saves a
StudentModuleHistory entry if the module_type is one that
we save.
"""
if instance.module_type in StudentModuleHistory.HISTORY_SAVING_TYPES:
history_entry = StudentModuleHistory(student_module=instance,
version=None,
created=instance.modified,
state=instance.state,
grade=instance.grade,
max_grade=instance.max_grade)
history_entry.save()
class ModelWithCallStckMngrChild(ModelWithCallStackMngr):
"""child class of ModelWithCallStackMngr
"""
objects = CallStackManager()
child_id_field = models.IntegerField()
class ModelWithCallStackMngr(models.Model):
"""
Test Model Class with overridden CallStackManager
"""
objects = CallStackManager()
id_field = models.IntegerField()
class ModelAnotherCallStckMngr(models.Model):
"""
Test Model class that only uses overridden Manager CallStackManager
"""
objects = CallStackManager()
id_field = models.IntegerField()