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79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
from django.core.exceptions import ValidationError
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from django.core.validators import MaxValueValidator, MinValueValidator
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from django.db import models
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from django.utils.translation import gettext_lazy as _
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class Currency(models.Model):
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code = models.CharField(max_length=10, unique=True, verbose_name=_("Currency Code"))
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name = models.CharField(max_length=50, verbose_name=_("Currency Name"), unique=True)
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decimal_places = models.PositiveIntegerField(
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default=2,
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validators=[MaxValueValidator(30), MinValueValidator(0)],
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verbose_name=_("Decimal Places"),
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)
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prefix = models.CharField(max_length=10, verbose_name=_("Prefix"), blank=True)
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suffix = models.CharField(max_length=10, verbose_name=_("Suffix"), blank=True)
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exchange_currency = models.ForeignKey(
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"self",
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verbose_name=_("Exchange Currency"),
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on_delete=models.SET_NULL,
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related_name="exchange_currencies",
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null=True,
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blank=True,
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help_text=_("Default currency for exchange calculations"),
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)
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def __str__(self):
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return self.name
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class Meta:
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verbose_name = _("Currency")
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verbose_name_plural = _("Currencies")
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def clean(self):
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super().clean()
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if self.exchange_currency == self:
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raise ValidationError(
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{
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"exchange_currency": _(
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"Currency cannot have itself as exchange currency."
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)
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}
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)
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class ExchangeRate(models.Model):
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from_currency = models.ForeignKey(
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Currency,
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on_delete=models.CASCADE,
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related_name="from_exchange_rates",
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verbose_name=_("From Currency"),
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)
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to_currency = models.ForeignKey(
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Currency,
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on_delete=models.CASCADE,
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related_name="to_exchange_rates",
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verbose_name=_("To Currency"),
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)
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rate = models.DecimalField(
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max_digits=42, decimal_places=30, verbose_name=_("Exchange Rate")
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)
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date = models.DateTimeField(verbose_name=_("Date and Time"))
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class Meta:
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verbose_name = _("Exchange Rate")
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verbose_name_plural = _("Exchange Rates")
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unique_together = ("from_currency", "to_currency", "date")
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def __str__(self):
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return f"{self.from_currency.code} to {self.to_currency.code} on {self.date}"
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def clean(self):
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super().clean()
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if self.from_currency == self.to_currency:
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raise ValidationError(
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{"to_currency": _("From and To currencies cannot be the same.")}
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)
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