how to work with foreign key field in django - python-3.x

Question

Hi Everyone i am working work django framework, where i used to upload excel file in Dailytrip table, current i get car_mumber from car table, but now i need to store car_number from Car_team table also team_id, i am storing car_id and team_id in car_team table also i need to store team_id in dailytrip table automaticlly based on car_id(car_number) i am to much confuse how to i work that, pls help me out
models.py
class Car_team(BaseModel):
team = models.ForeignKey(
Team,
models.CASCADE,
verbose_name='Team',
null=True,
)
car=models.ForeignKey(
Car,
models.CASCADE,
verbose_name='Car',
null=True)
city =models.ForeignKey(
City,
models.CASCADE,
verbose_name='City',
)
start_date=models.DateField(null=True, blank=True)
end_date=models.DateField(null=True, blank=True)
views.py
def add_payout_uber_daily_data(request):
if request.method == 'POST':
form = UberPerformanceDataForm(request.POST, request.FILES, request=request)
if form.is_valid():
date = form.cleaned_data['date']
excel_file = request.FILES['file']
df = pd.read_excel(excel_file)
is_na = pd.isna(df['Date']).sum().sum() + pd.isna(df['Name']).sum().sum() + pd.isna(df['UUID']).sum().sum() + pd.isna(df['Net Fare With Toll']).sum().sum() + pd.isna(df['Trips']).sum().sum() + pd.isna(df['Uber KMs']).sum().sum() + pd.isna(df['CashCollected']).sum().sum() + pd.isna(df['UberToll']).sum().sum() + pd.isna(df['Tips']).sum().sum() + pd.isna(df['Hours Online']).sum().sum() + pd.isna(df['Ratings']).sum().sum() + pd.isna(df['Acceptance Rate']).sum().sum() + pd.isna(df['Cancellation Rate']).sum().sum()
error_list = []
if is_na > 0:
error_list.append('Found #N/A or blank values in the sheet. Please correct and re-upload')
context = {'error_list': error_list, 'menu_payout': 'active','submenu_daily_data': 'active','form': form, }
return render(request, 'add_payout_uber_daily_data.html', context=context)
date_match = True
for d in df['Date']:
if str(d.strftime("%Y-%m-%d")) != str(date):
date_match = False
break
if not date_match:
error_list.append('Some dates are not matching in excel')
if len(error_list) > 0:
context = {'error_list': error_list, 'menu_payout': 'active','submenu_daily_data': 'active','form': form, }
return render(request, 'add_payout_uber_daily_data.html', context=context)
DailyTrip.objects.filter(date=date).update(is_active=0)
for i in df.index:
uuid = df['UUID'][i]
driver_id = None
car_id = None
fleet_id = None
manager_id = None
try:
driver = Driver.objects.get(uber_uuid=uuid)
driver_id = driver.id
except Driver.DoesNotExist:
driver_id = None
#replce car code and store car_number,car_id,team_id via car_team only this logic need to change current get car_number direct car table but we need car_number vai foriegn key
try:
car = Car.objects.get(car_number=df["Car Number"][i])
car_id = car.id
manager_id = car.manager_id
except Car.DoesNotExist:
car_id = None
try:
fleet = Fleet.objects.get(name=df["Fleet Name"][i])
fleet_id = fleet.id
except Fleet.DoesNotExist:
fleet_id = None
name = df['Name'][i]
car_number = df['Car Number'][i]
fare_total = df['Net Fare With Toll'][i]
trips = df['Trips'][i]
pool_trips = 0
hours_online = df['Hours Online'][i]
total_km = df['Uber KMs'][i]
cash_collected = abs(df['CashCollected'][i])
toll = df['UberToll'][i]
tip_amount = df['Tips'][i]
fare_avg = float(fare_total)/int(trips)
fare_per_hour_online = float(fare_total)/float(hours_online)
fare_per_km = fare_total/total_km
trips_per_hour = trips/hours_online
km_per_trip = total_km/trips
rating = df['Ratings'][i]
acceptance_rate_perc = float(df['Acceptance Rate'][i])/100
driver_cancellation_rate = float(df['Cancellation Rate'][i])/100
obj, created = DailyTrip.all_objects.update_or_create(
date=date, uuid=uuid,
defaults={
'car_id': car_id,
'manager_id': manager_id,
'car_number': car_number,
'driver_id': driver_id,
'car_id': car_id,
'fleet_id': fleet_id,
'driver_name': name,
'fare_total': fare_total,
'trips': trips,
'pool_trips': pool_trips,
'hours_online': hours_online,
'total_km': total_km,
'cash_collected': cash_collected,
'toll': toll,
'tip_amount': tip_amount,
'fare_avg': fare_avg,
'fare_per_hour_online':fare_per_hour_online,
'fare_per_km':fare_per_km,
'trips_per_hour': trips_per_hour,
'km_per_trip': km_per_trip,
'rating': rating,
'acceptance_rate_perc': acceptance_rate_perc,
'driver_cancellation_rate': driver_cancellation_rate,
'is_active': 1,
'comments': None}
)
if len(error_list) > 0:
DailyTrip.objects.filter(date=date).update(is_active=0)
context = {'error_list': error_list, 'menu_payout': 'active','submenu_daily_data': 'active','form': form, }
return render(request, 'add_payout_uber_daily_data.html', context=context)
else:
messages.success(request, 'Daily Trips added Successfully...')
return redirect('/fleet/payout/daily_data/add/uber')
else:
form = UberPerformanceDataForm(initial={})
context = {
'menu_payout': 'active',
'submenu_daily_data': 'active',
'form': form,
}
return render(request, 'add_payout_uber_daily_data.html', context=context)

Answer 1

You can try that :
to get car_number from car_team -->
car_team = car_team.objects.objects.all().last() # to get the last car_team for example
car_number = car_team.car.car_number # to get the car number from the car_team

Answer 2

try:
car = Car.objects.get(car_number=df["Car Number"][i])
car_id = car.id
car1=Car_team.objects.filter(car_id=car_id)
if car1:
team_id=car1[0].team_id
else:
team_id=None
except Car.DoesNotExist:
car_id = None
team_id= None