new_contents: # -*- coding: utf-8 -*-
  # Generated by Django 1.9b1 on 2015-11-17 15:06
  from __future__ import unicode_literals
  
  from django.conf import settings
  from django.db import migrations, models
  import django.db.models.deletion
  import django.utils.timezone
  import yunity.utils.models.field
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('yunity', '0002_item'),
      ]
  
      operations = [
          migrations.CreateModel(
              name='Group',
              fields=[
                  ('id', models.AutoField(primary_key=True, serialize=False)),
                  ('created_at', models.DateTimeField(default=django.utils.timezone.now)),
                  ('name', yunity.utils.models.field.MaxLengthCharField(max_length=255)),
                  ('description', models.TextField(null=True)),
              ],
              options={
                  'abstract': False,
              },
          ),
          migrations.CreateModel(
              name='GroupMembership',
              fields=[
                  ('id', models.AutoField(primary_key=True, serialize=False)),
                  ('created_at', models.DateTimeField(default=django.utils.timezone.now)),
                  ('group', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='yunity.Group')),
              ],
              options={
                  'abstract': False,
              },
          ),
          migrations.RenameField(
              model_name='user',
              old_name='date_joined',
              new_name='created_at',
          ),
          migrations.AddField(
              model_name='conversation',
              name='created_at',
              field=models.DateTimeField(default=django.utils.timezone.now),
          ),
          migrations.AddField(
              model_name='item',
              name='created_at',
              field=models.DateTimeField(default=django.utils.timezone.now),
          ),
          migrations.AlterField(
              model_name='conversationmessage',
              name='created_at',
              field=models.DateTimeField(default=django.utils.timezone.now),
          ),
          migrations.AddField(
              model_name='groupmembership',
              name='user',
              field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
          ),
          migrations.AddField(
              model_name='group',
              name='members',
              field=models.ManyToManyField(through='yunity.GroupMembership', to=settings.AUTH_USER_MODEL),
          ),
      ]
  
subject: Add group and creation date field migration