if model filed type is BigInt, import excel data error

[luohaifenglight]

if model filed type is BigInt, such as 163371428940853127, to be convert 163371428940853120 overflow.

[bmihelac]

Hi @luohaifenglight and thanks for opening this issue. Can you add failing test case?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[josx]

Same here!
Failing case:

diff --git a/tests/core/tests/test_widgets.py b/tests/core/tests/test_widgets.py
index 7969961..5d41b58 100644
--- a/tests/core/tests/test_widgets.py
+++ b/tests/core/tests/test_widgets.py
@@ -253,11 +253,11 @@ class DecimalWidgetTest(TestCase):
class IntegerWidgetTest(TestCase):

def setUp(self):
-        self.value = 0
+        self.value = 163371428940853127
self.widget = widgets.IntegerWidget()

def test_clean_integer_zero(self):
-        self.assertEqual(self.widget.clean(0), self.value)
+        self.assertEqual(self.widget.clean(163371428940853127), self.value)

Then make test, result:

PYTHONPATH=".:tests:" django-admin test core --settings=settings
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
..........................................................................................................................................................s...............................................................................................................FF.............................s
======================================================================
FAIL: test_clean_integer_zero (core.tests.test_widgets.IntegerWidgetTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/tmp/django-import-export/tests/core/tests/test_widgets.py", line 260, in test_clean_integer_zero
self.assertEqual(self.widget.clean(163371428940853127), self.value)
AssertionError: 163371428940853120 != 163371428940853127

[josx]

This is the problem

>>> int(float(163371428940853127))
163371428940853120

https://github.com/django-import-export/django-import-export/blob/main/import_export/widgets.py#L88

[josx]

I will do a PR with this fix:
Tomorrow I Will do a PR using decimal instead of float:

>>> import decimal
>>> int(decimal.Decimal(163371428940853127))
163371428940853127