Ignore non-significant digits when computing differences between Deci…

…mal fields

CHANGELOG.md

@@ -1,6 +1,7 @@
 # New in version UNRELEASED
 
 * Generate `dati_riepilogo` with properly set `natura` (#27)
+* Ignore non-significant digits when computing differences between Decimal fields
 
 # New in version 0.1.5
 

a38/fields.py

@@ -352,6 +352,23 @@ def validate(self, validation, value):
                         "'{}' should be no more than {} digits long".format(xml_value, self.max_length))
         return value
 
+    def diff(self, res: Diff, first: Optional[T], second: Optional[T]):
+        """
+        Report to res if there are differences between values first and second
+        """
+        first = self.clean_value(first)
+        second = self.clean_value(second)
+        has_first = self.has_value(first)
+        has_second = self.has_value(second)
+        if not has_first and not has_second:
+            return
+        elif has_first and not has_second:
+            res.add_only_first(self, first)
+        elif not has_first and has_second:
+            res.add_only_second(self, second)
+        elif first.quantize(self.quantize_sample) != second.quantize(self.quantize_sample):
+            res.add_different(self, first, second)
+
 
 class StringField(ChoicesField[str]):
     def __init__(self, length=None, min_length=None, max_length=None, **kw):

tests/test_fields.py

@@ -354,7 +354,8 @@ def test_to_python(self):
     def test_diff(self):
         f = self.get_field()
         self.assert_diff_empty(f, Decimal("1.0"), "1.0")
-        self.assert_field_diff(f, "1.0001", "1.0002")
+        self.assert_diff_empty(f, "1.0001", "1.0002")
+        self.assert_field_diff(f, "1.1", "1.2")
 
     def test_xml(self):
         f = self.get_field(null=True)