Default index name not set outside of migrations

[Mads Jensen]

If an index is added outside of the migration-system, then the name will default to the empty string. This can be reproduced in the test suite by removing the name-argument to the constructor of either BrinIndex or GinIndex.

django/models/base.py calls set_set_name_with_model. Perhaps this call could be moved to Index instead?

[Tim Graham]

What's the use case for adding indexes without using migrations and how is it done? I'm not sure if this should be supported.

[Mads Jensen]

I suppose it may be an obscure case, so maybe closing this as "works for me" or "some day/maybe" would be fine.

[Markus Holtermann]

name is supposed to be a required argument when you define an index in _meta.indexes. However, for backwards compatibility reasons with auto-generated index names for e.g. db_index=True and index_together the name cannot be set during object creation but needs to be patched in later while running migrations.