def get_page(cls, query=None, cursor=None, sort=None, amount=50):
c = None
if cursor:
c = Cursor.from_websafe_string(cursor)
if not query:
query = cls.query()
if sort:
query = query.order(cls.generate_order_from_string(sort))
data, next_cursor, more = query.fetch_page(amount, start_cursor=c)
data = {cls._get_kind(): data}
if more:
data["cursor"] = next_cursor.to_websafe_string()
return data
def get_results_with_cursors(self, query, reverse_query, size):
cursor = self.request.get('cursor', None)
if cursor:
try:
cursor = Cursor.from_websafe_string(cursor)
except:
cursor = None
next_cursor = previous_cursor = None
if cursor is not None:
reverse_cursor = cursor.reversed()
reverse_results, reverse_next_cursor, reverse_more = reverse_query.fetch_page(
size, start_cursor=reverse_cursor
)
if reverse_more:
previous_cursor = reverse_next_cursor.reversed()
previous_cursor = previous_cursor.to_websafe_string()
else:
previous_cursor = 'START'
results, next_cursor, more = query.fetch_page(size, start_cursor=cursor)
if more:
next_cursor = next_cursor.to_websafe_string()
else:
next_cursor = None
return results, previous_cursor, next_cursor
