[Django]-Django __str__ with multiple elements

2👍

This seems to be a problem in the widget used in the Admin interface, not directly in your Training_unit.
Check your Trainint_unit Admin model, the problem is probably there. Maybe you use a TabularInline for your admin model so that other things (like a Date widget) is loaded?

3👍

You are looking to wrong place. This model __str__ is ok.

Try to click on the

File "C:\Python34\lib\site-packages\django\forms\forms.py" in as_widget
   599.         return force_text(widget.render(name, self.value(), attrs=attrs))

You will see locals variables at this line, and name should point to the actual problematic field.

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