def navigation_items_object(self, slug):
"""
Flatten the items by category and then get prev and next based on sorted cat
"""
temp_todo_list = []
navigation_items = Bunch(prev=None, current=None, next=None)
for cat, items in self.todos_by_cat.iteritems():
if items:
for i in items:
temp_todo_list.append(i)
for c, item in enumerate(temp_todo_list):
try:
previous = temp_todo_list[c-1]
except IndexError:
previous = None
try:
next = temp_todo_list[c+1]
except IndexError:
next = None
if str(item.slug) == str(slug):
navigation_items.prev = previous
navigation_items.current = item
navigation_items.next = next
# exit the forloop
break
return navigation_items
