50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
from decimal import Decimal
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from django.db import models
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from django.utils import timezone
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class PriceField(models.DecimalField):
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# allowing numbers until 99,999.99
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max_digits = 7
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decimal_places = 2
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def to_python(self, value):
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value = super().to_python(value)
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if isinstance(value, Decimal):
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return value.quantize(Decimal(10) ** -self.decimal_places)
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return value
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def __init__(self, *args, **kwargs):
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kwargs['max_digits'] = self.max_digits
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kwargs['decimal_places'] = self.decimal_places
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super().__init__(*args, **kwargs)
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class Subject(models.Model):
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name = models.CharField(max_length=64)
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created_time = models.DateTimeField(default=timezone.now)
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def __str__(self):
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return self.name
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class Transaction(models.Model):
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class Meta:
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get_latest_by = "booking_date"
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amount = PriceField()
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booking_date = models.DateField()
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subject = models.ForeignKey(
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to=Subject, on_delete=models.CASCADE,
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related_name="transactions", related_query_name="transaction",
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)
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class Balance(models.Model):
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class Meta:
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get_latest_by = "date"
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amount = PriceField()
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date = models.DateField()
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