Skip row is not consistent when used inside and outside the admin

Describe the bug Changes on the dataset are detected if using the admin to import a dataset.

Programmatic import shows no differences.

To Reproduce CharField with null value in the database skip_unchanged = True in the ModelResource

Versions (please complete the following information):

• Django Import Export: 2.8.0 and 3.0b3
• Python 3.8
• Django 3.2

Expected behavior Same import result in both cases.

Additional context

Code from 3.0b3 as an example:

    def skip_row():
            ....
            else:
                # debug values for "name" column
                if field.column_name == 'name':
                    print('instance: "%s"' % field.get_value(instance), 'original: "%s"' % field.get_value(original))
                if field.get_value(instance) != field.get_value(original):
                    return False

Admin shows: instance “” original “None”, so reports them as different Management command shows: instance “None” original “None”, no changes are reported

I think the Admin is wrong, or it could be a configuration issue 😃

[matthewhegarty]

Have got a failing test here. Still some work to do.

[manelclos]

Hi @matthewhegarty, I’ve setup the failing scenario in the admin import test, but I’m unable to reproduce, I always get None on “isbn” field both for instance and original. I will try to debug on the server, and also try the default setting.