def save(self, *args, **kwargs):
"""if there's an existing checkin for this month/email, delete that one and replace it with this checkin"""
existing_checkin = Commutersurvey.objects.filter(
wr_day_month=self.wr_day_month, email=self.email)
if self.id:
# if this instance has already been saved we need to filter out this instance from our results.
existing_checkin = existing_checkin.exclude(pk=self.id)
if existing_checkin.exists():
existing_checkin.delete()
"""overwrites the save method in order to calculate all the data!"""
changes = self.calculate_difference()
self.carbon_change = sanely_rounded(changes["carbon"])
self.calorie_change = sanely_rounded(changes["calories"])
self.change_type = self.change_analysis()
self.already_green = self.check_green()
self.carbon_savings = sanely_rounded(self.carbon_saved())
self.calories_total = self.calories_totalled()
super(Commutersurvey, self).save(*args, **kwargs)
def save(self, *args, **kwargs):
"""if there's an existing checkin for this month/email, delete that one and replace it with this checkin"""
existing_checkin = Commutersurvey.objects.filter(wr_day_month=self.wr_day_month, email=self.email)
if self.id:
# if this instance has already been saved we need to filter out this instance from our results.
existing_checkin = existing_checkin.exclude(pk=self.id)
if existing_checkin.exists():
existing_checkin.delete()
"""overwrites the save method in order to calculate all the data!"""
changes = self.calculate_difference()
self.carbon_change = sanely_rounded(changes["carbon"])
self.calorie_change = sanely_rounded(changes["calories"])
self.change_type = self.change_analysis()
self.already_green = self.check_green()
self.carbon_savings = sanely_rounded(self.carbon_saved())
self.calories_total = self.calories_totalled()
super(Commutersurvey, self).save(*args, **kwargs)
def calculate_difference(self):
"""
Calculates the difference in terms of calories burned and
carbon emmitted between the commute of this check-in and that
of an average (driving) commute.
Returns results as a dict, with 'carbon' and 'calories' keyed to
their changes
"""
legs = self.leg_set.only('carbon', 'calories', 'day').all()
difference = {'carbon': 0.000, 'calories': 0.000}
for leg in legs:
if leg.day == 'w':
difference["carbon"] += sanely_rounded(leg.carbon)
difference["calories"] += sanely_rounded(leg.calories)
elif leg.day == 'n':
difference["carbon"] -= sanely_rounded(leg.carbon)
difference["calories"] -= sanely_rounded(leg.calories)
# import pdb; pdb.set_trace()
return difference
def calculate_difference(self):
"""
Calculates the difference in terms of calories burned and
carbon emmitted between the commute of this check-in and that
of an average (driving) commute.
Returns results as a dict, with 'carbon' and 'calories' keyed to
their changes
"""
legs = self.leg_set.only('carbon', 'calories', 'day').all()
difference = {'carbon': 0.000, 'calories': 0.000}
for leg in legs:
if leg.day == 'w':
difference["carbon"] += sanely_rounded(leg.carbon)
difference["calories"] += sanely_rounded(leg.calories)
elif leg.day == 'n':
difference["carbon"] -= sanely_rounded(leg.carbon)
difference["calories"] -= sanely_rounded(leg.calories)
# import pdb; pdb.set_trace()
return difference
def calc_metrics(self):
"""Calculate the carbon output and calories burned for this leg"""
calories = 0.0
carbon = 0.0
if self.mode:
met = self.mode.met or 0.0
carb = self.mode.carb or 0.0
kcal = float(met) # kcal/(kg*hour) from this mode
if kcal > 0.0:
#kcal burned by leg using average weight of 81 kg,
#based on duration in minutes
calories = kcal * (self.duration/60) * 80.7
#grams carbon dioxide per passenger-mile on this mode
coo = float(carb)
#grn = self.mode.green
if coo > 0.0: #and grn<>'f'
speed = self.mode.speed or 0.0
s = float(speed) # average speed in mph
#kilograms carbon expended in leg based on duration in minutes
carbon = (coo/1000) * s * (self.duration/60)
return {'carbon': sanely_rounded(carbon), 'calories': sanely_rounded(calories)}
def carbon_saved(self):
"""returns the total carbon saved from all legs in kg"""
normal_car_carbon = 0.0
wr_day_carbon = 0.0
legs = self.leg_set.only('carbon', 'day').all()
for leg in legs:
if leg.day == 'n':
car_speed = Mode.objects.get(name="Driving alone").speed
car_carbon = Mode.objects.get(name="Driving alone").carb/1000
carbon = car_carbon * car_speed * leg.duration/60
normal_car_carbon += carbon
elif leg.day == 'w':
wr_day_carbon += leg.carbon
carbon_saved = normal_car_carbon - wr_day_carbon
return sanely_rounded(carbon_saved)
def calc_metrics(self):
"""Calculate the carbon output and calories burned for this leg"""
calories = 0.0
carbon = 0.0
if self.mode:
met = self.mode.met or 0.0
carb = self.mode.carb or 0.0
kcal = float(met) # kcal/(kg*hour) from this mode
if kcal > 0.0:
#kcal burned by leg using average weight of 81 kg,
#based on duration in minutes
calories = kcal * (self.duration / 60) * 80.7
#grams carbon dioxide per passenger-mile on this mode
coo = float(carb)
#grn = self.mode.green
if coo > 0.0: #and grn<>'f'
speed = self.mode.speed or 0.0
s = float(speed) # average speed in mph
#kilograms carbon expended in leg based on duration in minutes
carbon = (coo / 1000) * s * (self.duration / 60)
return {
'carbon': sanely_rounded(carbon),
'calories': sanely_rounded(calories)
}
def carbon_saved(self):
"""returns the total carbon saved from all legs in kg"""
normal_car_carbon = 0.0
wr_day_carbon = 0.0
legs = self.leg_set.only('carbon', 'day').all()
for leg in legs:
if leg.day == 'n':
car_speed = Mode.objects.get(name="Driving alone").speed
car_carbon = Mode.objects.get(name="Driving alone").carb / 1000
carbon = car_carbon * car_speed * leg.duration / 60
normal_car_carbon += carbon
elif leg.day == 'w':
wr_day_carbon += leg.carbon
carbon_saved = normal_car_carbon - wr_day_carbon
return sanely_rounded(carbon_saved)
def carbon_saved(self):
"""returns the total carbon saved from all legs in kg"""
normal_car_carbon = 0.0
wr_day_carbon = 0.0
legs = self.leg_set.all()
# don't calculate if all the legs are driving alone.
# if legs.filter(day='n').count() == legs.filter(day='n', mode__name="Driving alone").count():
# return None
for leg in legs:
if leg.day == 'n':
leg_distance = leg.duration/60 * leg.mode.speed # hr * mph = miles
car_carbon = Mode.objects.get(name="Driving alone").carb/1000 # kilograms carbon per passenger-mile
leg_car_carbon = car_carbon * leg_distance # kilograms
normal_car_carbon += leg_car_carbon
elif leg.day == 'w':
wr_day_carbon += leg.carbon # kilograms
carbon_saved = normal_car_carbon - wr_day_carbon
return sanely_rounded(carbon_saved*1000) # grams
def carbon_saved(self):
"""returns the total carbon saved from all legs in kg"""
normal_car_carbon = 0.0
wr_day_carbon = 0.0
legs = self.leg_set.all()
# don't calculate if all the legs are driving alone.
# if legs.filter(day='n').count() == legs.filter(day='n', mode__name="Driving alone").count():
# return None
for leg in legs:
if leg.day == 'n':
leg_distance = leg.duration / 60 * leg.mode.speed # hr * mph = miles
car_carbon = Mode.objects.get(
name="Driving alone"
).carb / 1000 # kilograms carbon per passenger-mile
leg_car_carbon = car_carbon * leg_distance # kilograms
normal_car_carbon += leg_car_carbon
elif leg.day == 'w':
wr_day_carbon += leg.carbon # kilograms
carbon_saved = normal_car_carbon - wr_day_carbon
return sanely_rounded(carbon_saved * 1000) # grams
