def get(self): exercise_key_str = self.request.get('exercise') try: exercise = Exercise.get(db.Key(exercise_key_str)) except db.BadKeyError: #Yes - we are raising the same exception we are catching #We want to error out, and we want to programmatically check #When we get around to implementing custom exceptions, #this will be replaced raise db.BadKeyError exercise_muscles = exercise_util.get_exercise_muscles(exercise) db.run_in_transaction(self.__delete_exercise, exercise, exercise_muscles) self.redirect(self.request.headers['Referer'])
def get(self): exercise_key_str = self.request.get('exercise') try: exercise = Exercise.get(db.Key(exercise_key_str)) except db.BadKeyError: #Yes - we are raising the same exception we are catching #We want to error out, and we want to programmatically check #When we get around to implementing custom exceptions, #this will be replaced raise db.BadKeyError exercise_muscles = exercise_util.get_exercise_muscles(exercise) self.template_vars['exercise'] = exercise self.template_vars['exercise_muscles'] = exercise_muscles self.template_path = os.path.join(os.path.dirname(__file__), 'exercise_view.html') self.dispatch()
def post(self): muscles = self.request.get('muscles', allow_multiple=True) muscle_roles = filter(reps_util.emptyFilter, self.request.get('roles', allow_multiple=True)) exercise_name = self.request.get('exercise_name') exercise_type_str = self.request.get('exercise_type') edit_exercise = self.request.get('edit_exercise') old_exercise_muscles = [] #data validation, we aren't going to give #feedback since validation with feedback is #done on the client. if len(muscles) == 0 or len(muscles) != len(muscle_roles) \ or len(exercise_name) < 3 \ or len(exercise_name) > 30 \ or len(exercise_type_str) == 0: raise "ExerciseValidationError" try: muscle_roles.index('Target') except ValueError: raise "ExerciseValidationError" #validation complete #wait until after validation to assign this. #it will throw it's own exception if you pass #a null value to the Category constructor exercise_type_cat = db.Category(exercise_type_str) if edit_exercise: #we are editing the exercise try: exercise = Exercise.get(db.Key(edit_exercise)) except db.BadKeyError: #Yes - we are raising the same exception we are catching #We want to error out, and we want to programmatically check #When we get around to implementing custom exceptions, #this will be replaced raise db.BadKeyError exercise.name = exercise_name exercise.type = exercise_type_cat #the following var used to store the ExerciseMuscle entities #related to the Exercise entity (if we are editing) #these are then passed to the save method so that #we can delete them safely within a transaction old_exercise_muscles = exercise_util.get_exercise_muscles(exercise) else: #check to see if an exercise already exists with this name #if not, create the new exercise try: existing_exercise = Exercise.gql('WHERE name = :1',exercise_name).fetch(1)[0] if existing_exercise: self.errors.append('An exercise already exists with the name ' + exercise_util.exercise_edit_link(existing_exercise) + '. Click the link to edit it.') self.get() return except IndexError: #this is what we want - it means the #exercise name doesn't exist in the datastore pass #create the new exercise exercise = Exercise(name=exercise_name,type=exercise_type_cat) #todo: this should be put in the transaction below #when the app engine bug preventing root entities #and their decendants from being created in the #same transaction exercise.put() #server side validation found_target = False new_exercise_muscles = [] for muscle_key, muscle_role in zip(muscles,muscle_roles): muscle = Muscle.get(db.Key(muscle_key)) if muscle_role == 'Target': if found_target == True: #uh oh, more than one target defined, crap out raise "ExerciseValidationError" #yeah, no fancy feedback. All that is done on the client. just die. else: found_target = True exercise.target_location = muscle.location exercise_muscle = ExerciseMuscle(exercise=exercise,muscle=muscle,role=muscle_role,parent=exercise) new_exercise_muscles.append(exercise_muscle) #if we didn't have a target muscle for the exercise #once again, crap out with no feedback if found_target == False: raise "ExerciseValidationError" #put the exercise again, so that we now save the target_location #super TODO - put this all in a transaction. exercise.put() #and now we're ready to commit the Exercise and ExerciseMuscle entities #it is all isolated within a transaction try: db.run_in_transaction(self.__save_exercise_muscles, new_exercise_muscles, old_exercise_muscles) self.messages.append('Exercise <b>' + exercise.name + '</b> (' + exercise_util.exercise_edit_link(exercise) + ') has been successfully saved.') except db.Rollback: self.errors.append('A database error occured. The exercise was not saved.') self.get()