102 lines
3.7 KiB
Python
102 lines
3.7 KiB
Python
from datetime import date
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from django.db import models
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from django.db.models import Q
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class MonthlyTrip(models.Model):
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MONTH_CHOICES = [
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(1, 'January'), (2, 'February'), (3, 'March'), (4, 'April'),
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(5, 'May'), (6, 'June'), (7, 'July'), (8, 'August'),
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(9, 'September'), (10, 'October'), (11, 'November'), (12, 'December'),
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]
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year = models.PositiveIntegerField(verbose_name="Year")
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month = models.PositiveSmallIntegerField(choices=MONTH_CHOICES, verbose_name="Month")
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kilometers = models.PositiveIntegerField(default=0, verbose_name="Kilometers")
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class Meta:
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constraints = [
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models.UniqueConstraint(fields=['year', 'month'], name='unique_monthly_trip')
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]
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verbose_name = "Monthly Trip"
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verbose_name_plural = "Monthly Trips"
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def __str__(self):
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return f"{self.month:02d}.{self.year} : {self.kilometers} km"
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class FuelPurchase(models.Model):
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GAS_STATION_CHOICES = [
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(0, 'Unknown'),
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(1, 'Neste'),
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(2, 'Teboil'),
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(3, 'ABC'),
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(4, 'Shell'),
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(5, 'St1'),
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(6, 'SEO'),
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(7, 'Ysi5'),
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]
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OCTANE_CHOICES = [
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(95, '95'),
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(98, '98'),
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]
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CAR_CHOICES = [
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(0, 'Unknown'),
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(1, 'Renault'),
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(2, 'Nissan'),
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(3, 'Smart'),
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]
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purchase_date = models.DateField(default=date.today, verbose_name="Purchase Date")
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total_cost = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="Total Cost (€)")
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price_per_litre = models.DecimalField(max_digits=6, decimal_places=3, verbose_name="Price per Litre (€)")
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amount_litres = models.DecimalField(max_digits=7, decimal_places=2, verbose_name="Amount (litres)")
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octane = models.PositiveSmallIntegerField(choices=OCTANE_CHOICES, default=95, verbose_name="Octane")
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gas_station = models.PositiveSmallIntegerField(choices=GAS_STATION_CHOICES, default=0, verbose_name="Gas Station")
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car = models.PositiveSmallIntegerField(choices=CAR_CHOICES, default=0, verbose_name="Car")
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monthly_trip = models.ForeignKey(MonthlyTrip, on_delete=models.CASCADE, related_name='fuel_purchases', verbose_name="Monthly Trip")
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class Meta:
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constraints = [
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models.UniqueConstraint(
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fields=[
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'purchase_date',
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'total_cost',
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'price_per_litre',
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'amount_litres',
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'octane',
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'gas_station',
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'car',
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],
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name='unique_fuel_purchase'
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),
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models.CheckConstraint(check=Q(total_cost__gt=0) & Q(total_cost__lt=1000), name="total_cost_range"),
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models.CheckConstraint(check=Q(price_per_litre__gt=0) & Q(price_per_litre__lt=5), name="price_per_litre_range"),
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models.CheckConstraint(check=Q(amount_litres__gt=0) & Q(amount_litres__lt=100), name="amount_litres_range"),
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]
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verbose_name = "Fuel Purchase"
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verbose_name_plural = "Fuel Purchases"
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def save(self, *args, **kwargs):
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if not self.amount_litres and self.price_per_litre:
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self.amount_litres = self.total_cost / self.price_per_litre
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if not self.monthly_trip_id:
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month = self.purchase_date.month
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year = self.purchase_date.year
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monthly_trip, created = MonthlyTrip.objects.get_or_create(
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year=year,
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month=month,
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defaults={'kilometers': 0}
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)
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self.monthly_trip = monthly_trip
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super().save(*args, **kwargs)
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def __str__(self):
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date_str = self.purchase_date.strftime("%d.%m.%Y")
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return f"{date_str} : {self.total_cost} € - {self.price_per_litre} €/L"
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