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Use 'is not None' and add comments
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1 changed files with 6 additions and 2 deletions
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@ -140,7 +140,9 @@ class ReceiptsWorkerStore(SQLBaseStore):
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"""
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room_ids = set(room_ids)
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if from_key:
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if from_key is not None:
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# Only ask the database about rooms where there have been new
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# receipts added since `from_key`
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room_ids = yield self._receipts_stream_cache.get_entities_changed(
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room_ids, from_key
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)
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@ -163,7 +165,9 @@ class ReceiptsWorkerStore(SQLBaseStore):
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Returns:
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list: A list of receipts.
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"""
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if from_key:
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if from_key is not None:
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# Check the cache first to see if any new receipts have been added
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# since`from_key`. If not we can no-op.
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if not self._receipts_stream_cache.has_entity_changed(room_id, from_key):
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defer.succeed([])
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