old_contents: # -*- coding: utf-8 -*-
  
  from __future__ import absolute_import, unicode_literals
  
  from django.conf import settings
  from django.utils.lru_cache import lru_cache
  
  
  CONFIG_DEFAULTS = {
      'GROUPS': {},
      'METADATA_MODEL': None,
  }
  
  
  @lru_cache()
  def get_config():
      USER_CONFIG = getattr(settings, 'HORIZONTAL_CONFIG', {})
  
      CONFIG = CONFIG_DEFAULTS.copy()
      CONFIG.update(USER_CONFIG)
  
      for name, horizontal_group in CONFIG['GROUPS'].items():
          horizontal_group['DATABASE_SET'] = set()
          for key, member in horizontal_group['DATABASES'].items():
              horizontal_group['DATABASE_SET'].add(member['write'])
              horizontal_group['DATABASE_SET'].update(member.get('read', []))
  
              if 'read' not in member:
                  member['read'] = [member['write']]
  
          if 'PICKABLES' not in horizontal_group:
              horizontal_group['PICKABLES'] = list(horizontal_group['DATABASES'].keys())
  
      return CONFIG
  
new_contents: # -*- coding: utf-8 -*-
  
  from __future__ import absolute_import, unicode_literals
  
  from django.conf import settings
  from django.utils.lru_cache import lru_cache
  
  
  CONFIG_DEFAULTS = {
      'GROUPS': {},
      'METADATA_MODEL': None,
  }
  
  
  @lru_cache()
  def get_config():
      USER_CONFIG = getattr(settings, 'HORIZONTAL_CONFIG', {})
  
      CONFIG = CONFIG_DEFAULTS.copy()
      CONFIG.update(USER_CONFIG)
  
      for name, horizontal_group in CONFIG['GROUPS'].items():
          horizontal_group['DATABASE_SET'] = set()
          for key, member in horizontal_group['DATABASES'].items():
              horizontal_group['DATABASE_SET'].add(member['write'])
              horizontal_group['DATABASE_SET'].update(member.get('read', []))
  
              if 'read' not in member:
                  member['read'] = [member['write']]
  
          if 'PICKABLES' not in horizontal_group:
              horizontal_group['PICKABLES'] = [int(i) for i in list(horizontal_group['DATABASES'].keys())]
  
      return CONFIG
  
subject: Index parse to int