old_contents: from posts.models import Post
  from signup.models import SignUp, SignUpSlot, TimeBlock
  from posts.serializers import PostSerializer
  from signup.serializers import SignUpSheetSerializer,SignUpSlotSerializer, TimeBlockSerializer
  
  def combine(requester, post, signup, num_slots_to_combine):
  
      timeblock_list = signup.myblocks.all()
      new_post = Post(author = requester, content = post.content)
      new_post.save()
      new_sign = SignUp(post = new_post, name = signup.name, location = signup.location,
                        max_slots = signup.max_slots, max_duration = signup.max_duration,
                        min_duration = signup.min_duration)
      new_sign.save()
  
      for block in timeblock_list:
          new_block = TimeBlock(sheet = new_sign, start_time= block.start_time, end_time = block.end_time)
          new_block.save()
          slot_list = block.myslots.all()
  
          i = 0
          j = i + num_slots_to_combine
  
          while j < len(slot_list):
              new_owner = None
              for index in range(i,j):
                  if (slot_list[index].owner == None) or (slot_list[index].owner == requester):
                      print 'Available slot'
                  else:
                      print 'Slot taken by: ' + slot_list[index].owner.username
                      new_owner = slot_list[index].owner
  
              new_slot = SignUpSlot(owner = new_owner, block = new_block,
                                    start_time = slot_list[i].start_time, end_time = slot_list[j].end_time)
              new_slot.save()
              i = i + 1
              j = j + 1
  
  
      data = SignUpSheetSerializer(new_sign)
  
      print data.data
      new_sign.delete()
      new_post.delete()
      return data.data
new_contents: from posts.models import Post
  from signup.models import SignUp, SignUpSlot, TimeBlock
  from posts.serializers import PostSerializer
  from signup.serializers import SignUpSheetSerializer,SignUpSlotSerializer, TimeBlockSerializer
  
  def combine(requester, post, signup, num_slots_to_combine):
  
      timeblock_list = signup.myblocks.all()
      new_post = Post(author = requester, content = post.content)
      new_post.save()
      new_sign = SignUp(post = new_post, name = signup.name, location = signup.location,
                        max_slots = signup.max_slots, max_duration = signup.max_duration,
                        min_duration = signup.min_duration)
      new_sign.save()
  
      for block in timeblock_list:
          new_block = TimeBlock(sheet = new_sign, start_time= block.start_time, end_time = block.end_time)
          new_block.save()
          slot_list = block.myslots.all()
  
          i = 0
          j = i + num_slots_to_combine
  
          while j <= len(slot_list):
              new_owner = None
              for index in range(i,j):
                  if (slot_list[index].owner == None) or (slot_list[index].owner == requester):
                      print 'Available slot'
                  else:
                      print 'Slot taken by: ' + slot_list[index].owner.username
                      new_owner = slot_list[index].owner
  
              new_slot = SignUpSlot(owner = new_owner, block = new_block,
                                    start_time = slot_list[i].start_time, end_time = slot_list[j-1].end_time)
              new_slot.save()
              i = i + 1
              j = j + 1
  
  
      data = SignUpSheetSerializer(new_sign)
  
      print data.data
      new_sign.delete()
      new_post.delete()
      return data.data
subject: Return all slots with requested duration. combine_slots bug fix