async def retrieve(self,
sender_id: Text) -> Optional[DialogueStateTracker]:
"""Retrieve dialogues for a sender_id in reverse-chronological order.
Based on the session_date sort key.
"""
dialogues = self.db.query(
KeyConditionExpression=Key("sender_id").eq(sender_id),
Limit=1,
ScanIndexForward=False,
)["Items"]
if not dialogues:
return None
events = dialogues[0].get("events", [])
# `float`s are stored as `Decimal` objects - we need to convert them back
events_with_floats = core_utils.replace_decimals_with_floats(events)
if self.domain is None:
slots = []
else:
slots = self.domain.slots
return DialogueStateTracker.from_dict(sender_id, events_with_floats,
slots)
def test_replace_decimals_with_floats(_input: Any, expected: Any):
assert utils.replace_decimals_with_floats(_input) == expected
