new_contents: # -*- coding: utf-8 -*-
  # Generated by Django 1.11.11 on 2018-04-30 18:34
  from __future__ import unicode_literals
  
  from django.db import migrations, models ,connection
  
  from osf.models import AbstractNode
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('osf', '0099_merge_20180427_1109'),
      ]
  
      def add_default_access_requests_enabled(self, *args, **kwargs):
          # Get the date the original noderequest migration was applied
          sql = "SELECT applied from django_migrations WHERE app = 'osf' AND name = '0077_add_noderequest_model';"
          with connection.cursor() as cursor:
              cursor.execute(sql)
              date_noderequest_migration = cursor.fetchall()[0][0]
  
          # Get all projects created before that
          AbstractNode.objects.filter(created__lte=date_noderequest_migration).update(access_requests_enabled=True)
  
      def remove_default_access_requests_enabled(self, *args, **kwargs):
          # Get the date the original noderequest migration was applied
          sql = "SELECT applied from django_migrations WHERE app = 'osf' AND name = '0077_add_noderequest_model';"
          with connection.cursor() as cursor:
              cursor.execute(sql)
              date_noderequest_migration = cursor.fetchall()[0][0]
  
          # Get all projects created before that
          AbstractNode.objects.filter(created__lte=date_noderequest_migration).update(access_requests_enabled=None)
  
      operations = [
          migrations.AlterField(
              model_name='noderequestaction',
              name='permissions',
              field=models.CharField(choices=[(b'read', b'Read'), (b'write', b'Write'), (b'admin', b'Admin')], default=b'read', max_length=5),
          ),
          migrations.RunPython(add_default_access_requests_enabled, remove_default_access_requests_enabled),
      ]
  
subject: Add default value of access requests enabled to exsisting projects made before model added