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models.py
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models.py
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from typing import Collection
from django.db import models
from django.core.exceptions import ValidationError
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from django.core.validators import RegexValidator, MinLengthValidator
from utils.django.models import get_user_model
from utils.django.validators import user_is_active_validator
from .validators import user_write_authorization_validator
from .managers import *
User = get_user_model()
#https://medium.com/@rui.jorge.rei/today-i-learned-django-queryset-default-ordering-is-no-ordering-416547ee946f
#https://capitalnumbers.medium.com/django-best-practices-code-structure-naming-conventions-and-design-patterns-fe572c547755
#https://docs.djangoproject.com/en/3.2/ref/models/options/#django.db.models.Options.ordering -> SEE WARNING SECTION
# Create your models here.
class Engine(models.Model):
name = models.CharField(max_length=200, verbose_name='Name')
objects = EngineQuerySet.as_manager()
class Meta:
ordering = ['-id']
verbose_name = 'Engine'
verbose_name_plural = 'Engines'
def __str__(self):
return '{}'.format(self.name)
class Car(models.Model):
name = models.CharField(max_length=200, verbose_name='Name', validators=[MinLengthValidator(10)])
engine = models.ForeignKey(Engine, on_delete=models.CASCADE, verbose_name='Engine')
objects = CarQuerySet.as_manager()
class Meta:
ordering = ['-id']
verbose_name = 'Car'
verbose_name_plural = 'Cars'
def __str__(self):
return '{} {}'.format(self.name, self.engine)
class CarUser(models.Model):
car = models.ForeignKey(Car, on_delete=models.CASCADE, verbose_name='Car', related_name='car_user')
user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name='User')
number_plate = models.CharField(max_length=10, verbose_name='Number plate',
validators=[RegexValidator(regex=r'^[0-9a-zA-Z]*$')],
)
user_created = models.ForeignKey(User, on_delete=models.CASCADE,
verbose_name='User',
related_name='car_user_created',
validators=[user_write_authorization_validator, user_is_active_validator])
datetime_created = models.DateTimeField(default=timezone.now, verbose_name='Datetime')
objects = CarUserQuerySet.as_manager()
class Meta:
ordering = ['-id']
verbose_name = 'Car bouth by user'
verbose_name_plural = 'Cars bouth by users'
unique_together = ['car', 'user', 'number_plate']
def _number_plate_user_validator(self):
user = self.user
last_name = user.last_name
first_name = user.first_name
fullname = '{} {}'.format(last_name, first_name)
for number_plate_char in list(self.number_plate.lower()):
if number_plate_char in list(fullname.lower()):
return
raise ValidationError(_('The name of the user must be included in the number plate'))
def _car_user_validator(self):
user = self.user
last_name = user.last_name
first_name = user.first_name
fullname = '{} {}'.format(last_name, first_name)
for car_name_char in list(self.car.name.lower()):
if car_name_char in list(fullname.lower()):
return
raise ValidationError(_('The name of the car must be included in the user name'))
#https://stackoverflow.com/questions/61507845/model-clean-vs-model-clean-fields
def clean(self):
"""
Validate rules for multiple fields before save it
https://www.django-rest-framework.org/api-guide/serializers/#object-level-validation
https://docs.djangoproject.com/en/3.2/ref/models/instances/#django.db.models.Model.clean
"""
super().clean()
self._number_plate_user_validator()
self._car_user_validator()
def __str__(self):
return '{} {} {}'.format(self.car, self.user, self.number_plate)