models

models.py

from uuid import uuid4
from django.db import models
from django.core.validators import MinValueValidator

class Rate(models.Model):
    id = models.UUIDField(primary_key=True,
                          editable=False,
                          default=uuid4,
                          unique=True)

    description = models.CharField(max_length=120)
    amount = models.DecimalField(max_digits=8, decimal_places=2)
    days = models.PositiveIntegerField(validators=[MinValueValidator(1)])
    amount_per_day = models.DecimalField(max_digits=8,
                                         decimal_places=3,
                                         editable=False,
                                         blank=True)