How to Resolve Django Fixture Loading IntegrityErrors Caused by ContentType Conflicts?

Issues with ContentTypes during Django Fixture Loading

Problem:

While attempting to load Django fixtures into a MySQL database, you encounter contenttypes conflicts. After dumping data from multiple apps, including "escola," and attempting to load the data as a fixture, you receive the following constraint violation:

IntegrityError: (1062, "Duplicate entry 'escola-t23aluno' for key 2")

It appears that Django is attempting to recreate contenttypes with different primary key values that conflict with the values in the fixture.

Solution:

The recommended solution is to use dumpdata --natural. This option uses "natural keys" to represent foreign keys, which are more durable and less prone to conflicts. For example, instead of using Permission.id, it uses Permission.codename.

Additional Tips:

Consider the following additional arguments for dumpdata:

• --indent=4: Adds indentation for readability.
• -e sessions: Excludes session data.
• -e admin: Excludes admin action history.
• -e contenttypes -e auth.Permission: Excludes objects that are automatically recreated during syncdb when used with --natural. This can prevent alignment issues with ID numbers.

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