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()
