old_contents: from __future__ import unicode_literals
  
  from django.conf import settings
  from django.db import models
  from django.utils.encoding import python_2_unicode_compatible
  from django.utils.translation import ugettext as _
  
  
  @python_2_unicode_compatible
  class Tag(models.Model):
      slug = models.SlugField(unique=True)
      description = models.TextField(null=True, blank=True)
  
      def __str__(self):
          return self.slug
  
  
  @python_2_unicode_compatible
  class Wallet(models.Model):
      CURRENCIES = (
          ("EUR", "EUR"),
      )
      owner = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='wallets')
      label = models.CharField(max_length=100)
      description = models.TextField(null=True, blank=True)
      currency = models.CharField(max_length=3, null=False, blank=False, choices=CURRENCIES)
  
      def __str__(self):
          return "{} ({})".format(self.label, self.currency)
  
  
  @python_2_unicode_compatible
  class Movement(models.Model):
      wallet = models.ForeignKey(Wallet, related_name="movements")
      date = models.DateTimeField()
      amount = models.DecimalField(max_digits=11, decimal_places=2)
  
      tags = models.ManyToManyField(Tag, related_name="movements")
  
      def __str__(self):
          return "{} - {:.2f} for {} on {}".format(
              self.type, self.amount, self.wallet, self.date)
  
new_contents: from __future__ import unicode_literals
  
  from django.conf import settings
  from django.db import models
  from django.utils import timezone
  from django.utils.encoding import python_2_unicode_compatible
  from django.utils.translation import ugettext as _
  
  
  @python_2_unicode_compatible
  class Tag(models.Model):
      slug = models.SlugField(unique=True)
      description = models.TextField(null=True, blank=True)
  
      def __str__(self):
          return self.slug
  
  
  @python_2_unicode_compatible
  class Wallet(models.Model):
      CURRENCIES = (
          ("EUR", "EUR"),
      )
      owner = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='wallets')
      label = models.CharField(max_length=100)
      description = models.TextField(null=True, blank=True)
      currency = models.CharField(max_length=3, null=False, blank=False, choices=CURRENCIES)
  
      def __str__(self):
          return "{} ({})".format(self.label, self.currency)
  
  
  @python_2_unicode_compatible
  class Movement(models.Model):
      wallet = models.ForeignKey(Wallet, related_name="movements")
      date = models.DateTimeField(default=timezone.now())
      amount = models.DecimalField(max_digits=11, decimal_places=2)
  
      tags = models.ManyToManyField(Tag, related_name="movements")
  
      def __str__(self):
          return "{} - {:.2f} for {} on {}".format(
              self.type, self.amount, self.wallet, self.date)
  
subject: Add default to movement date