old_contents: from personalisation.models import AbstractBaseRule, Segment
  
  
  class SegmentMiddleware(object):
      """Middleware for testing and putting a user in a segment"""
  
      def __init__(self, get_response=None):
          self.get_response = get_response
  
      def __call__(self, request):
          segments = Segment.objects.all().filter(status="enabled")
  
          chosen_segments = []
  
          for segment in segments:
              rules = AbstractBaseRule.objects.filter(segment=segment).select_subclasses()
              result = self.test_rules(rules, request)
  
              if result:
                  self.add_segment_to_user(segment, request)
  
          response = self.get_response(request)
  
          print(request.session['segments'])
  
          return response
  
      def test_rules(self, rules, request):
          for rule in rules:
              result = rule.test_user(request)
  
              if result is False:
                  return False
  
          return True
  
      def add_segment_to_user(self, segment, request):
          if 'segments' not in request.session:
              request.session['segments'] = []
  
          if segment not in request.session['segments']:
              request.session['segments'].append(segment.encoded_name())
  
  
new_contents: from personalisation.models import AbstractBaseRule, Segment
  
  
  class SegmentMiddleware(object):
      """Middleware for testing and putting a user in a segment"""
  
      def __init__(self, get_response=None):
          self.get_response = get_response
  
      def __call__(self, request):
          segments = Segment.objects.all().filter(status="enabled")
  
          chosen_segments = []
  
          for segment in segments:
              rules = AbstractBaseRule.objects.filter(segment=segment).select_subclasses()
              result = self.test_rules(rules, request)
  
              if result:
                  self.add_segment_to_user(segment, request)
  
          response = self.get_response(request)
  
          if not request.session.get('segments'):
              request.session['segments'] = []
  
          print(request.session['segments'])
  
          return response
  
      def test_rules(self, rules, request):
          for rule in rules:
              result = rule.test_user(request)
  
              if result is False:
                  return False
  
          return True
  
      def add_segment_to_user(self, segment, request):
          if 'segments' not in request.session:
              request.session['segments'] = []
  
          if segment not in request.session['segments']:
              request.session['segments'].append(segment.encoded_name())
  
  
subject: Create empty 'segments' object in session if none exists