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Editorial Team
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Asked: 2026-05-24T11:52:45+00:00

When I try to dump the data of my model in Django with this

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When I try to dump the data of my model in Django with this instruction : 

python manage.py dumpdata app> temp_data.json

It gives the following error :

Error: One or more models did not validate:
asset.authpermission: "codename": CharField cannot have a "max_length" greater than 255 when using "unique=True".
asset.djangocontenttype: "app_label": CharField cannot have a "max_length" greater than 255 when using "unique=True".
asset.djangocontenttype: "model": CharField cannot have a "max_length" greater than 255 when using "unique=True".

The thing is that these tables are auto-generated by django. Plus I just checked in the database (mysql) and the fields are varchar(100).

What’s wrong ?

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1 Answer

  1. Editorial Team

    Those tables are generated by a manage.py inspectdb right? Then you don’t need to include django’s own models into the actual generated models. Just remove any model starting with auth, django, admin and site.

    Just include the corresponding contrib apps to the INSTALLED_APPS setting and voila, no more errors.

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