NPO-Accounting/oxrlib Changeset - 9d4723824592

Changeset - 9d4723824592

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Brett Smith - 7 years ago 2017-05-16 16:26:32
brettcsmith@brettcsmith.org

rate: Add Rate.convert method.

3 files changed with 19 insertions and 2 deletions:

oxrlib/rate.py

tests/historical1.json

tests/test_Rate.py

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oxrlib/rate.py

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 import datetime
 import decimal
 import functools
 import json
 class Rate:
     FIELDS = [
         'base',
@@ ... / @@ -31,17 +32,24 @@ class Rate: @@
         self.rates = rates
     @classmethod
     def deserialize_timestamp(cls, value):
         return datetime.datetime.fromtimestamp(value)
     @classmethod
     def serialize_rates(cls, rates):
         return {code: float(rates[code]) for code in rates}
     @classmethod
     def serialize_timestamp(cls, value):
         return int(value.timestamp())
     @classmethod
     def from_json_file(cls, json_file):
         response = json.load(json_file)
+        response = json.load(json_file, parse_float=decimal.Decimal)
         return cls(**response)
     def convert(self, amount, from_currency, to_currency):
         return amount * self.rates[to_currency] / self.rates[from_currency]
     def serialize(self):
         return dict(self.walk_fields(functools.partial(getattr, self), 'serialize'))

tests/historical1.json

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@@ ... / @@ -3,9 +3,10 @@ @@
     "license": "https://openexchangerates.org/license/",
     "timestamp": 982342800,
     "base": "USD",
     "rates": {
         "AED": 3.67246,
         "ALL": 144.529793,
         "ANG": 1.79
         "ANG": 1.79,
         "USD": 1
+    }
+}

tests/test_Rate.py

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 import datetime
 import decimal
 import io
 import json
 from . import relpath
 import oxrlib.rate
 import pytest
 HIST1_AED_RATE = decimal.Decimal('3.67246')
 HIST1_ALL_RATE = decimal.Decimal('144.529793')
 @pytest.fixture
 def historical1_rate():
     with open(relpath('historical1.json').as_posix()) as rate_file:
         return oxrlib.rate.Rate.from_json_file(rate_file)
 def test_rate_from_json(historical1_rate):
@@ ... / @@ -18,6 +22,10 @@ def test_rate_from_json(historical1_rate): @@
 def test_serialize(historical1_rate):
     with open(relpath('historical1.json').as_posix()) as rate_file:
         expected = json.load(rate_file)
     assert expected == historical1_rate.serialize()
 def test_convert(historical1_rate):
     assert historical1_rate.convert(2, 'USD', 'ALL') == (2 * HIST1_ALL_RATE)
     assert historical1_rate.convert(10, 'AED', 'USD') == (10 / HIST1_AED_RATE)
     assert historical1_rate.convert(1, 'AED', 'ALL') == (HIST1_ALL_RATE / HIST1_AED_RATE)

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