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November 28, 2020 03:36
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data migration
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| class Message(): | |
| def normalize(self): | |
| # If message lacks a 'likes' counter, initialize one | |
| if not hasattr(self, 'count_likes'): | |
| self.count_likes = 0 | |
| # Each time you are fetching a message from datastore, do | |
| # something like: | |
| msg = fetch_from_database(message_id) | |
| msg.normalize() | |
| msg.save() |
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