How to Resolve Django Fixture ContentType Conflicts When Loading into MySQL?

Django Fixtures and ContentType Issues

Attempting to load Django fixtures into a MySQL database can lead to content type conflicts. Dumping data from a specific app initially results in missing foreign key issues, necessitating the inclusion of additional apps in the dump command. However, loading the fixture with this approach encounters a constraint violation due to conflicting primary keys for content types.

This situation stems from Django's attempt to recreate content types dynamically with different primary key values than those present in the fixture. As suggested in Django's bug tracking system, a workaround is to dump data from the content types app.

However, if custom model permissions are defined, the recommended solution becomes questionable. To resolve this, utilizing --natural in the dumpdata command is recommended. This option employs natural keys for foreign keys, which enhances durability.

Here's an example demonstrating this approach:

./manage.py dumpdata --natural escola > fixture.json

Furthermore, there are other helpful arguments that can be used with dumpdata, including:

• --indent=4: Improves readability by indenting the output
• -e sessions: Excludes session data from the dump
• -e admin: Excludes the history of admin actions
• -e contenttypes -e auth.Permission: Excludes objects recreated automatically during syncdb, but requires --natural to prevent primary key alignment issues

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