*Aim to achieve* - Get call stacks where specific model classes are used.
(Example - MyModel.objects.save(), MyModel.objects.filter(), etc)
*My Approach - *
Add this in order to override *Save* and *Delete*.
Class MyModelClass(CallStackMixin, models.Model)
In order to override *get_query_set*, I am overriding Model classes by
objects = CallStackManager()
In both *CallStackManager* and *CallStackMixin* I am calling
*capture_call_stack* which eventually logs calls.
ex.
class CallStackManager(Manager):
""" A Manager class which overrides the default Manager class for
getting call stacks
"""
def get_query_set(self):
"""overriding the default queryset API method
"""
capture_call_stack(type(self))
return super(CallStackManager, self).get_query_set()
Also, I am defining a decorator *@donottrack* functionality where obvious
calls to model classes are made. So that I would just log the new unique
call stacks.
Definition for *@donottrack* is here -
def donottrack(*classes_not_to_be_tracked):
"""function decorator which deals with toggling call stack
Args:
classes_not_to_be_tracked: model classes where tracking is
undesirable
Returns:
wrapped function
"""
@wrapt.decorator
def real_donottrack(wrapped, instance, args, kwargs): # pylint:
disable=W0613
"""takes function to be decorated and returns wrapped function
Args:
function - wrapped function i.e. real_donottrack
"""
global HALT_TRACKING # pylint: disable=W0603
HALT_TRACKING.append(classes_not_to_be_tracked)
HALT_TRACKING[-1] = list(set([x for sublist in HALT_TRACKING for x
in sublist]))
return_value = wrapped(*args, **kwargs)
HALT_TRACKING.pop()
return return_value
return real_donottrack
*HALT_TRACKING* here is global var which keeps track of model classes not
to be tracked scoped to that particular function.
Also, using *Wrapt* in order to retain identity of wrapped functions.
Strangely, *HALT_TRACKING.pop()* gets executed before the call to *Save*,
*delete* or *get_query_set* is made.
Any idea why it is so?
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