47 lines
2.1 KiB
Python
47 lines
2.1 KiB
Python
from django.db import models
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from django.contrib.auth.models import User
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from decimal import Decimal, Context
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class NonscientificDecimalField(models.DecimalField):
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""" Prevents values from being displayed with E notation, with trailing 0's
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after the decimal place truncated. (This causes precision to be lost in
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many cases, but is more user friendly and consistent for non-scientist
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users)
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"""
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def value_from_object(self, obj):
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def remove_exponent(val):
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"""Remove exponent and trailing zeros.
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>>> remove_exponent(Decimal('5E+3'))
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Decimal('5000')
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"""
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context = Context(prec=self.max_digits)
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return val.quantize(Decimal(1), context=context) if val == val.to_integral() else val.normalize(context)
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val = super(NonscientificDecimalField, self).value_from_object(obj)
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if isinstance(val, Decimal):
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return remove_exponent(val)
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# Create your models here.
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class Transaction(models.Model):
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TRANSACTION_TYPES = (
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('B', 'Buy Crypto'),
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('S', 'Sell Crypto'),
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('T', 'Transfer Crypto'),
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)
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trade_id = models.CharField(max_length=20, default='MANUAL')
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owner = models.ForeignKey(User, on_delete=models.CASCADE)
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crypto_currency = models.CharField(max_length=10)
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crypto_amount = NonscientificDecimalField(max_digits=24, decimal_places=10, null=True, blank=True)
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crypto_fee = NonscientificDecimalField(max_digits=24, decimal_places=10, null=True, blank=True)
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exchange_rate = NonscientificDecimalField(max_digits=24, decimal_places=10)
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fiat_currency = models.CharField(max_length=10)
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fiat_amount = NonscientificDecimalField(max_digits=24, decimal_places=10, null=True, blank=True)
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fiat_fee = NonscientificDecimalField(max_digits=24, decimal_places=10, null=True, blank=True)
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date_valid = models.DateTimeField('date transfered')
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transaction_type = models.CharField(max_length=1, choices=TRANSACTION_TYPES, default='B')
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description = models.CharField(max_length=100, null=True, blank=True)
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class Meta:
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db_table = "transaction"
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