Add Money.__abs__ and Money.__hash__

tests/test_fields_money.py

@@ -156,6 +156,22 @@ def test_money_str(self, iv, cur, ov):
     def test_money_cents(self, func, iv, cur, ov):
         assert func(fields.Money(iv, cur)) == ov
 
+    def tests_abs(self):
+        value = abs(fields.Money('-3.14', 'RUB'))
+        assert isinstance(value, fields.Money)
+        assert value.currency.string == 'RUB'
+        assert value > 0
+        assert value.total_cents > 0
+
+    @pytest.mark.parametrize('first, seccond, equal', [
+        (fields.Money('3.14', 'RUB'), fields.Money('3.14', 'RUB'), True),
+        (fields.Money('3.14', 'RUB'), fields.Money('2.48', 'RUB'), False),
+        (fields.Money('3.14', 'RUB'), fields.Money('-3.14', 'RUB'), False),
+        (fields.Money('3.14', 'RUB'), fields.Money('3.14', 'EUR'), False),
+    ])
+    def tests_hash(self, first, seccond, equal):
+        assert (hash(first) == hash(seccond)) is equal
+
 
 class TestCurrencyStorage:
     @pytest.mark.parametrize('key, code, string, precision', [

yadm/fields/money/money.py

@@ -18,7 +18,7 @@ class DocClass(Document):
 
     {
         id: ObjectId('534272984c78591787e1a964'),
-        money: {v: 314, c: 840}
+        money: {v: 314, c: 'USD'}
     }
 """
 from decimal import Decimal, Context, ROUND_UP
@@ -132,6 +132,9 @@ def total_cents(self) -> int:
         quantized = self.value.quantize(precision_decimal, ROUND_UP)
         return int(quantized * 10 ** precision)
 
+    def __abs__(self):
+        return self.__class__(abs(self._value), self.currency)
+
     @_checker
     def __add__(self, target):
         return self.__class__(self.value + target.value, self.currency)
@@ -179,6 +182,9 @@ def __le__(self, other):
     def __bool__(self):
         return bool(self.value)
 
+    def __hash__(self):
+        return hash(str(self))
+
     def __str__(self):
         precision = self.currency.precision
         precision_decimal = Decimal('1.' + '0' * precision)