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[bug] Round Decimal to 9 places to support DynamoDB constraints #5092

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merged 9 commits into from
Jan 22, 2020
Merged

[bug] Round Decimal to 9 places to support DynamoDB constraints #5092

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e7acd44
Round Decimal to 9 places to support DynamoDB constraints
domsammut Jan 20, 2020
07d1d37
Add changelog
domsammut Jan 20, 2020
11789c0
Add test for rounding a long float value
domsammut Jan 20, 2020
8d1823e
Requested changes
domsammut Jan 20, 2020
35bce61
Lint fix :)
domsammut Jan 20, 2020
fbcbab2
Update rasa/core/utils.py with documentation change
domsammut Jan 21, 2020
7878cc3
Merge branch 'master' into master
domsammut Jan 21, 2020
0dad81c
Merge branch 'master' into master
wochinge Jan 21, 2020
d2c7355
Merge branch 'master' into master
wochinge Jan 22, 2020
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1 change: 1 addition & 0 deletions changelog/5092.bugfix.rst
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@@ -0,0 +1 @@
DynamoDB tracker store decimal values will now be rounded on save. Previously values exceeding 38 digits caused an unhandled error.
7 changes: 4 additions & 3 deletions rasa/core/utils.py
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Expand Up @@ -458,14 +458,15 @@ def handler(fut: Future) -> None:
return handler


def replace_floats_with_decimals(obj: Union[List, Dict]) -> Any:
def replace_floats_with_decimals(obj: Union[List, Dict], round_digits: int = 9) -> Any:
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"""
Utility method to recursively walk a dictionary or list converting all `float` to `Decimal` as required by DynamoDb.

Args:
obj: A `List` or `Dict` object.
round_digits: A int value to set the rounding precision of Decimal values.

Returns: An object with all matching values and `float` type replaced by `Decimal`.
Returns: An object with all matching values and `float` types replaced by `Decimal`s rounded to `round_digits` decimal places.

"""
if isinstance(obj, list):
Expand All @@ -477,7 +478,7 @@ def replace_floats_with_decimals(obj: Union[List, Dict]) -> Any:
obj[j] = replace_floats_with_decimals(obj[j])
return obj
elif isinstance(obj, float):
return Decimal(obj)
return round(Decimal(obj), round_digits)
else:
return obj

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2 changes: 2 additions & 0 deletions tests/core/test_utils.py
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Expand Up @@ -98,6 +98,7 @@ def test_float_conversion_to_decimal():
d = {
"int": -1,
"float": 2.1,
"float_round": 1579507733.1107571125030517578125,
"list": ["one", "two"],
"list_of_floats": [1.0, -2.1, 3.2],
"nested_dict_with_floats": {"list_with_floats": [4.5, -5.6], "float": 6.7},
Expand All @@ -106,6 +107,7 @@ def test_float_conversion_to_decimal():

assert isinstance(d_replaced["int"], int)
assert isinstance(d_replaced["float"], Decimal)
assert d_replaced["float_round"] == Decimal("1579507733.110757113")
for t in d_replaced["list"]:
assert isinstance(t, str)
for f in d_replaced["list_of_floats"]:
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