Django — MediaDefiningClass object is not iterable

For me, the cause of this error was sending arguments to the register function in the wrong order.

Check the order of registering a ModelAdmin: it’s the model class first, then the ModelAdmin class.

Example: admin.site.register(Model, ModelAdmin)

I suppose naturally the second one has to be the ModelAdmin since register(MyModel) works as well. That’s one good way to think about it.

Published by Yuji Tomita

I'm a human person. I excel in crafting holistic technology solutions that extend beyond a narrow technical scope.

17 Comments

  1. Carl says:
    January 20, 2011 at 2:31 pm

    Thanks for the tip – this was a confusing error.

    Reply
  2. eng. Ilian Iliev says:
    March 10, 2011 at 4:14 am

    Thanks a lot, a really helpful post. And a nice idea how not to confuse the order.

    Reply
  3. sparkle says:
    May 4, 2011 at 3:33 pm

    Thanks a lot, dude. It was really helpful

    Reply
  4. paravozovich says:
    December 1, 2011 at 7:37 am

    Thank you! You save my time and nerves 🙂

    Reply
  5. Redevil says:
    May 3, 2012 at 2:36 am

    thanks 🙂

    Reply
  6. Pierre Geier says:
    October 2, 2012 at 5:14 am

    I got this error too, but had no idea what was causing it, because nothing looked wrong in my admin.py. It’s not the problem that drives you insane, it’s finding the resolution for it 🙂

    Reply
  7. Kamil says:
    February 16, 2013 at 7:19 am

    Thanks, that’s goot tip. I forgot to add “Admin” to name of the class.

    Reply
  8. Chris Wilson (@qwirx) says:
    March 11, 2013 at 10:50 am

    Thanks!

    Reply
  9. agansert says:
    May 9, 2013 at 4:39 pm

    awesome

    Reply
  10. Lisa Ballard (@BasilLeaf) says:
    June 27, 2013 at 8:36 pm

    thank you!

    Reply
  11. Will Farley says:
    August 31, 2013 at 2:35 pm

    This was at the top of the search for “‘MediaDefiningClass’ object is not iterable” and is the obvious solution! Thanks, it was nice not having to stress over a an Error Page for once!

    Reply
  12. rafal says:
    January 5, 2014 at 7:46 am

    thanks man

    Reply
  13. Bruce Davis says:
    April 27, 2015 at 8:17 am

    Thanks for posting this, it helped me

    Reply
  14. Gadjimurad says:
    May 4, 2015 at 3:03 pm

    Thank you for article.It’s very useful.

    Reply
  15. Ali says:
    June 6, 2016 at 1:26 am

    That solved the problem, thanks

    Reply
  16. Kirk DeBaets says:
    October 3, 2016 at 12:02 pm

    Thank you for posting this! Nearly pulled all of my hair out!!

    Reply
  17. Juan Franco Martin says:
    August 5, 2018 at 6:43 pm

    Thanks!!!

    Reply

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