Fixed #22272 -- Fixed regression in DecimalField when using decimal_places=0.

Thanks to trac user merb for the report.

django/db/models/fields/__init__.py

@@ -1379,9 +1379,9 @@ class DecimalField(Field):
 
     def deconstruct(self):
         name, path, args, kwargs = super(DecimalField, self).deconstruct()
-        if self.max_digits:
+        if self.max_digits is not None:
             kwargs['max_digits'] = self.max_digits
-        if self.decimal_places:
+        if self.decimal_places is not None:
             kwargs['decimal_places'] = self.decimal_places
         return name, path, args, kwargs
 

tests/field_deconstruction/tests.py

@@ -110,6 +110,16 @@ class FieldDeconstructionTests(TestCase):
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {"max_digits": 5, "decimal_places": 2})
 
+    def test_decimal_field_0_decimal_places(self):
+        """
+        A DecimalField with decimal_places=0 shoudl work (#22272).
+        """
+        field = models.DecimalField(max_digits=5, decimal_places=0)
+        name, path, args, kwargs = field.deconstruct()
+        self.assertEqual(path, "django.db.models.DecimalField")
+        self.assertEqual(args, [])
+        self.assertEqual(kwargs, {"max_digits": 5, "decimal_places": 0})
+
     def test_email_field(self):
         field = models.EmailField()
         name, path, args, kwargs = field.deconstruct()