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| @classmethod | |
| def get_page(cls, app_id, bookmark=None): | |
| pagesize = 15 | |
| first_fetch = not bookmark | |
| if first_fetch: | |
| ascending = False | |
| date = None | |
| elif bookmark.startswith('-'): # we're moving backwards | |
| ascending = False | |
| date = str_to_date(bookmark[1:]) | |
| else: | |
| ascending = True | |
| date = str_to_date(bookmark) | |
| FOO = Transaction.app_id(app_id).order('date' if ascending else '-date') | |
| if date: | |
| filter_op = '<=' if ascending else '>' | |
| FOO = FOO.filter('date ' + filter_op, date) | |
| transactions = FOO.fetch(pagesize + 1) | |
| more = len(transactions) == pagesize+1 | |
| less = not first_fetch | |
| if more: # we have one more page to show | |
| next = transactions[-1].date | |
| transactions = transactions[:pagesize] | |
| else: | |
| next = None | |
| if not ascending: | |
| more, less = less, more | |
| return transactions, next, more or None, less or None |
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