new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import migrations, models
  from django.conf import settings
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          migrations.swappable_dependency(settings.AUTH_USER_MODEL),
          ('problem_builder', '0001_initial'),
      ]
  
      operations = [
          migrations.CreateModel(
              name='Share',
              fields=[
                  ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                  ('submission_uid', models.CharField(max_length=32)),
                  ('block_id', models.CharField(max_length=255, db_index=True)),
                  ('notified', models.BooleanField(default=False, db_index=True)),
                  ('shared_by', models.ForeignKey(related_name='problem_builder_shared_by', to=settings.AUTH_USER_MODEL)),
                  ('shared_with', models.ForeignKey(related_name='problem_builder_shared_with', to=settings.AUTH_USER_MODEL)),
              ],
          ),
          migrations.AlterUniqueTogether(
              name='share',
              unique_together=set([('shared_by', 'shared_with', 'block_id')]),
          ),
      ]
  
subject: Add in Django migration for shares.