def create_cars(count=200):
current_car_count = Car.objects().count()
if current_car_count >= count:
print("There are currently {:,} cars. Skipping create.")
return []
count = count - current_car_count
hp_factor = 660
mpg_factor = 21
liters_factor = 4
cars = []
print("Building cars...")
for _ in range(0, count):
model = random.choice(models)
make = 'Ferrari'
year = random.randint(1985, datetime.now().year)
mileage = random.randint(0, 150000)
mpg = int((mpg_factor + mpg_factor * random.random() / 4) * 10) / 10.0
horsepower = int(hp_factor + hp_factor * random.random() / 2)
liters = int((liters_factor + liters_factor * random.random() / 2) * 100) / 100.0
engine = Engine(horsepower=horsepower, liters=liters, mpg=mpg)
car = Car(model=model, make=make, year=year, engine=engine, mileage=mileage)
cars.append(car)
print("Saving cars...")
Car.objects().insert(cars)
return list(Car.objects())
def create_cars(count=200):
current_car_count = Car.objects().count()
if current_car_count >= count:
print("There are currently {:,} cars. Skipping create.")
return []
count = count - current_car_count
hp_factor = 660
mpg_factor = 21
liters_factor = 4
cars = []
print("Building cars...")
for _ in range(0, count):
model = random.choice(models)
make = 'Ferrari'
year = random.randint(1985, datetime.now().year)
mileage = random.randint(0, 150000)
mpg = int((mpg_factor + mpg_factor * random.random() / 4) * 10) / 10.0
horsepower = int(hp_factor + hp_factor * random.random() / 2)
liters = int((liters_factor + liters_factor * random.random() / 2) * 100) / 100.0
engine = Engine(horsepower=horsepower, liters=liters, mpg=mpg)
car = Car(model=model, make=make, year=year, engine=engine, mileage=mileage)
cars.append(car)
print("Saving cars...")
Car.objects().insert(cars)
return list(Car.objects())
def create_car(model: str, make: str, year: int,
horsepower: int, liters: float,
mpg: float, mileage: int) -> Car:
engine = Engine(horsepower=horsepower, liters=liters, mpg=mpg)
car = Car(model=model, make=make, year=year, engine=engine, mileage=mileage)
car.save()
return car
def create_car(model: str, make: str, year: int, mileage: float,
horsepower: int, liters: float, mpg: float) -> Car:
engine = Engine(horsepower=horsepower, liters=liters, mpg=mpg)
car = Car(model=model, make=make, year=year, mileage=mileage engine=engine)
car.save()
return Car
def percent_cars_with_bad_service():
t0 = datetime.datetime.now()
bad = Car.objects().filter(service_history__customer_rating__lte=1).count()
dt = datetime.datetime.now() - t0
print("bad computed in {} ms, bad: {:,}".format(dt.total_seconds() * 1000, bad))
all_cars = Car.objects().count()
percent = 100 * bad / max(all_cars, 1)
return percent
def percent_cars_with_bad_service():
t0 = datetime.datetime.now()
bad = Car.objects().filter(service_history__customers_rating__lte=1).count()
dt = datetime.datetime.now() - t0
print('bad computed in {} ms, bad: {:,}'.format(dt.total_seconds() * 1000, bad))
all_cars = Car.objects().count()
percent = 100 * bad / max(all_cars, 1)
return percent
def service_car():
# vin = input("What is the VIN of the car to service? ")
# car = Car.objects(vi_number=vin).first()
# if not car:
# print("Car with VIN {} not found!".format(vin))
# return
#
# service = ServiceHistory()
# service.price = float(input("What is the price? "))
# service.description = input("What type of service is this? ")
# service.customer_rating = int(input("How happy is our customer? [1-5] "))
#
# car.service_history.append(service)
# car.save()
vin = input("What is the VIN of the car to service? ")
service = ServiceHistory()
service.price = float(input("What is the price? "))
service.description = input("What type of service is this? ")
service.customer_rating = int(input("How happy is our customer? [1-5] "))
updated = Car.objects(vi_number=vin).update_one(push__service_history=service)
if updated == 0:
print("Car with VIN {} not found!".format(vin))
return
def service_car():
# vin = input("What is the VIN of the car to service? ")
# car = Car.objects(vi_number=vin).first()
# if not car:
# print("Car with VIN {} not found!".format(vin))
# return
# service = ServiceHistory()
# service.price = float(input("What is the price? "))
# service.description = input("What type of service is this? ")
# service.customer_rating = int(input("How happy is our customer? [1-5] "))
# car.service_history.append(service)
# car.save()
vin = input("What is the VIN of the car to service? ")
service = ServiceHistory()
service.price = float(input("What is the price? "))
service.description = input("What type of service is this? ")
service.customer_rating = int(input("How happy is our customer? [1-5] "))
updated = Car.objects(vi_number=vin).update_one(
push__service_history=service)
if updated == 0:
print("Car with VIN {} not found!".format(vin))
return
def service_car():
# vin = input('What is the vin of the car to service? ')
# car = Car.objects().filter(vi_number=vin).first()
# if not car:
# print('Car with VIN {} not found'.format(vin))
# return
# print('We will service '+ car.model)
# service = ServiceHistory()
# service.price = float(input('What is the price? '))
# service.description = input('What type of service is this? ')
# service.customer_rating = int(input('How happy our costumer? [1-5]'))
# car.service_history.append(service)
# car.save()
vin = input('What is the vin of the car to service? ')
service = ServiceHistory()
service.price = float(input('What is the price? '))
service.description = input('What type of service is this? ')
service.customer_rating = int(input('How happy our costumer? [1-5] '))
updated = Car.objects(vi_number=vin).update_one(
push__service_history=service)
if updated == 0:
print("Car with VIN {} not found!\n".format(vin))
return
def add_service_record(car_id, description, price, customer_rating):
record = ServiceRecord(description=description,
price=price,
customer_rating=customer_rating)
res = Car.objects(id=car_id).update_one(push__service_history=record)
if res != 1:
raise Exception("No car with id {}".format(car_id))
def list_cars():
cars = Car.objects().order_by("-year")
for car in cars:
print("{} -- {} with vin {} (year {})".format(car.make, car.model,
car.vi_number, car.year))
print("{} of service records".format(len(car.service_history)))
for s in car.service_history:
print(" * ${:,.0f} {}".format(s.price, s.description))
print()
def list_cars():
cars = Car.objects().order_by("-year")
for car in cars:
print("{} -- {} with vin {} (year {})".format(
car.make, car.model, car.vi_number, car.year))
print("{} of service records".format(len(car.service_history)))
for s in car.service_history:
print(" * ${:,.0f} {}".format(s.price, s.description))
print()
def list_cars():
cars = Car.objects().order_by('-year')
for car in cars:
print(
f'{car.make} -- {car.model} with vin {car.vi_number} (year {car.year})'
)
print(f'{len(car.service_history)} of service records\n')
for s in car.service_history:
print(' * ${:,.0f} {}'.format(s.price, s.description))
print()
def show_poorly_serviced_cars():
level = int(input("What max level of satisfaction are we looking for? [1-5] "))
# { "service_history.customer_rating": {$lte: level} }
cars = Car.objects(service_history__customer_rating__lte=level)
for car in cars:
print("{} -- {} with vin {} (year {})".format(
car.make, car.model, car.vi_number, car.year))
print("{} of service records".format(len(car.service_history)))
for s in car.service_history:
print(" * Satisfaction: {} ${:,.0f} {}".format(
s.customer_rating, s.price, s.description))
print()
def list_cars():
cars = Car.objects().order_by("-year")
for car in cars:
print(
f"{car.make} -- {car.model} with vin {car.vi_number} year {car.year}"
)
print(f"{len(car.service_history)}")
for s in car.service_history:
print(f" * ${s.price} {s.description}")
print()
print()
def service_car():
vin = input("What is the VIN of the car to service? ")
service = ServiceHistory()
service.price = float(input("What is the price of service? "))
service.description = input("What type of service is this? ")
service.customer_rating = int(input("How happy is our customer? [1-5] "))
updated = Car.objects().filter(vi_number=vin).update_one(
push__service_history=service) # it does update the doc, if
# it finds it, will return 1, if not returns 0.
if updated == 0:
print("Car with VIN {} not found!".format(vin))
return
def show_poorly_serviced_cars():
level = int(
input("What max level of satisfaction are we looking for? [1-5] "))
# { "service_history.customer_rating": {$lte: level} }
cars = Car.objects(service_history__customer_rating__lte=level)
for car in cars:
print("{} -- {} with vin {} (year {})".format(car.make, car.model,
car.vi_number, car.year))
print("{} of service records".format(len(car.service_history)))
for s in car.service_history:
print(" * Satisfaction: {} ${:,.0f} {}".format(
s.customer_rating, s.price, s.description))
print()
def show_poor_serviced_cars():
level = int(
input('What max level of satisfaction are we looking for? [1-5] '))
# {'service_history.customres_reting': {$lte: level} }
cars = Car.objects(service_history__customer_rating__lte=level)
for car in cars:
print()
print(
f'{car.make} -- {car.model} with vin {car.vi_number} (year {car.year})'
)
print(f'{len(car.service_history)} of service records\n')
for s in car.service_history:
print(' * Stisfaction: {} ${:,.0f} {}\n'.format(
s.customer_rating, s.price, s.description))
def main():
mongo_setup.init()
print("Computing stats, this WILL take awhile...", flush=True)
cars = list(Car.objects())
print("There are {:,} cars.".format(len(cars)))
owners = list(Owner.objects())
print("There are {:,} owners.".format(len(owners)))
owned_cars = sum((len(o.car_ids) for o in owners))
print("Each owner owns an average of {:.2f} cars.".format(owned_cars / len(owners)))
service_histories = sum((len(c.service_history) for c in cars))
print("There are {:,} service histories.".format(service_histories))
print("Each car has an average of {:.2f} service records.".format(service_histories / len(cars)))
def add_car():
model = input("What is the model? ")
make = 'Ferrari' # input("What is the make? ")
year = int(input("Year built? "))
car = Car()
car.year = year
car.make = make
car.model = model
engine = Engine()
engine.horsepower = 700
engine.mpg = 20
engine.liters = 4.0
car.engine = engine
car.save()
def add_car():
model = input('What is the model: ')
make = input('What is the make: ')
year = int(input('Year built?: '))
car = Car()
car.year = year
car.make = make
car.model = model
engine = Engine()
engine.horsepower = 590
engine.mpg = 22
engine.liters = 4.0
car.engine = engine
car.save()
def main():
mongo_setup.init()
print("Computing stats, this WILL take awhile...", flush=True)
cars = list(Car.objects())
print("There are {:,} cars.".format(len(cars)))
owners = list(Owner.objects())
print("There are {:,} owners.".format(len(owners)))
owned_cars = sum((len(o.car_ids) for o in owners))
print("Each owner owns an average of {:.2f} cars.".format(owned_cars /
len(owners)))
service_histories = sum((len(c.service_history) for c in cars))
print("There are {:,} service histories.".format(service_histories))
print("Each car has an average of {:.2f} service records.".format(
service_histories / len(cars)))
def add_car():
model = input("What is the model? ")
make = 'Ferrari' # input("What is the make? ")
year = int(input("Year built? "))
car = Car()
car.year = year
car.make = make
car.model = model
engine = Engine()
engine.horsepower = 590
engine.mpg = 22
engine.liters = 4.0
car.engine = engine
car.save()
def add_car():
model = input('What is the model? ')
make = input('What is the make? ')
year = int(input('Year built? '))
# mileage = float(input('Mileage? '))
# vin = input('VIN? ')
car = Car()
car.model = model
car.make = make
car.year = year
# car.mileage = mileage
# car.vi_number = vin
engine = Engine()
engine.horsepower = 600
engine.mpg = 20
engine.liters = 5.0
car.engine = engine # equals to an object
car.save(
) # in order to insert it to db in active record style, where we work with a single document
def find_car_by_id(car_id: bson.ObjectId) -> Car:
car = Car.objects(id=car_id).first()
Car.objects().filter(id=car_id).first()
return car
def find_car_with_bad_service(limit=10) -> typing.List[Car]:
cars = Car.objects(sevice_history__customer_rating__lte=1)[:limit]
return list(cars)
return list(cars)
timed(
'How many cars are owned by the 10,000th owner?',
lambda: find_cars_by_owner(owner.id)
)
def find_owners_by_car(car_id):
print(car_id)
owners = Owner.objects(car_ids=car_id)
return list(owners)
car = Car.objects()[10000:10001][0]
timed(
'How many owners own the 10,000th car?',
lambda: find_owners_by_car(car.id)
)
owner50k = Owner.objects()[50000:50001][0]
timed(
'Find owner 50,000 by name?',
lambda: Owner.objects(name=owner50k.name).first()
)
timed(
'Cars with expensive service?',
lambda: Car.objects(service_history__price__gt=16800).count()
)
def find_cars_by_make(make):
car = Car.objects(make=make).first()
return car
def find_cars_with_bad_service(limit=10) -> typing.List[Car]:
cars = Car.objects(service_history__customer_rating__lt=4)[:limit]
return list(cars)
def find_cars_by_make(make) -> Car:
car = Car.objects(make=make).first()
return car
def add_service_record(car_id, description, price, customer_rating):
record = ServiceRecord(description=description, price=price, customer_rating=customer_rating)
res = Car.objects(id=car_id).update_one(push__service_history=record)
if res != 1:
raise Exception("No car with id {}".format(car_id))
def clear_db():
Car.drop_collection()
Owner.drop_collection()
def update_doc_versions():
for car in Car.objects():
car._mark_as_changed('vi_number')
car.save()
def find_car_by_id(car_id: bson.ObjectId) -> Car:
car = Car.objects(id=car_id).first()
Car.objects().filter(id=car_id).first()
return car
def clear_db():
Car.drop_collection()
Owner.drop_collection()
def find_cars_by_owner(owner_id):
the_owner = Owner.objects(id=owner_id).first()
cars = Car.objects().filter(id__in=the_owner.car_ids)
return list(cars)
t0 = datetime.now()
func()
dt = datetime.now() - t0
print("{} Time: {:,.3f} ms".format(msg,
dt.total_seconds() * 1000.0),
flush=True)
mongo_setup.init()
print("Time to ask some questions")
timed('How many owners?', lambda: Owner.objects().filter().count())
timed('How many cars?', lambda: Car.objects().filter().count())
timed('Find the 10,000th owner?',
lambda: Owner.objects().order_by('name')[10000:10001][0])
owner = Owner.objects().order_by('name')[10000:10001][0]
def find_cars_by_owner(owner_id):
the_owner = Owner.objects(id=owner_id).first()
cars = Car.objects().filter(id__in=the_owner.car_ids)
return list(cars)
timed('How many cars are owned by the 10,000th owner?',
lambda: find_cars_by_owner(owner.id))
