Notes

i also have this model

class Deposit(models.Model):
DEPOSIT_TYPES = [
('Deposit', 'Deposit'),
('Arbitrage', 'Arbitrage'),
('Bonus', 'Bonus'),
('Balance Adjustment', 'Balance Adjustment')
]

ASSET_TYPES = [
('Fiat', 'Fiat'),
('Crypto', 'Crypto'),
('Stocks', 'Stocks'),
('Indices', 'Indices')
]

deposit_id = models.CharField(max_length=10, unique=True, default='', editable=False)
user = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
deposit_type = models.CharField(max_length=20, choices=DEPOSIT_TYPES)
amount = models.DecimalField(max_digits=20, decimal_places=2)
asset_type = models.CharField(max_length=20, choices=ASSET_TYPES)
asset_ticker = models.CharField(max_length=10)
note = models.TextField(blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True)

def save(self, *args, **kwargs):
if not self.deposit_id:
self.deposit_id = generate_transaction_id('D-')
super().save(*args, **kwargs)
self.update_asset_balance()

def update_asset_balance(self):
if self.asset_type == 'Fiat':
asset = FiatAsset.objects.get(user=self.user, asset=self.asset_ticker)
elif self.asset_type == 'Crypto':
asset = CryptoAsset.objects.get(user=self.user, asset=self.asset_ticker)
elif self.asset_type == 'Stocks':
asset = StockAsset.objects.get(user=self.user, asset=self.asset_ticker)
elif self.asset_type == 'Indices':
asset = IndexAsset.objects.get(user=self.user, asset=self.asset_ticker)

asset.balance += self.amount
asset.save()

def clean(self):
super().clean()
valid_tickers = []
if self.asset_type == 'Fiat':
valid_tickers = dict(FiatAsset.FIAT_CHOICES).keys()
elif self.asset_type == 'Crypto':
valid_tickers = dict(CryptoAsset.CRYPTO_CHOICES).keys()
elif self.asset_type == 'Stocks':
valid_tickers = dict(StockAsset.STOCK_CHOICES).keys()
elif self.asset_type == 'Indices':
valid_tickers = dict(IndexAsset.INDEX_CHOICES).keys()

if self.asset_ticker not in valid_tickers:
raise ValidationError(f'Invalid {self.asset_type} asset ticker.')

but since we updated fiat model to

class FiatAsset(models.Model):
FIAT_CHOICES = [
('EUR', 'Euro', '€'),
('GBP', 'British Pound', '£'),
('CHF', 'Swiss Franc', 'CHF'),
('JPY', 'Japanese Yen', '¥'),
('USD', 'US Dollar', '$'),
]

user = models.ForeignKey('CustomUser', on_delete=models.CASCADE)
asset = models.CharField(max_length=3, choices=[(code, name) for code, name, symbol in FIAT_CHOICES])
balance = models.DecimalField(max_digits=10, decimal_places=2, default=0)

def __str__(self):
return f"{self.user.email} - {self.get_asset_display()}"

def get_asset_symbol(self):
return next(symbol for code, name, symbol in self.FIAT_CHOICES if code == self.asset)

now when i try to make a deposit from django admin it says
dictionary update sequence element #0 has length 3; 2 is required