Change_column Oracle index limit

I'm trying to execute a simply change_column on oracle, with the
following output:
-- change_column(:comments, :text, :string, {:limit=>1000})
rake aborted!
An error has occurred, this and all later migrations canceled:

Index name
'temp_index_altered_comments_on_commentable_id_and_commentable_type'
on table 'altered_comments' is too long; the limit is 64 characters

How do I specify the name of the temporary index in the migration?

e.g.

add_index :things , :thing_id , :name => 'thing_index'

Yes, but how do I do this with change_column?

No idea, and I doubt you can :slight_smile:

Can you post the migration itself and the current schema for the table?

You know what? Nevermind. Turns out that table is deleted later in my
migrations, so I'll just comment this line out. Still would like to
know how to do this, if it's even possible.

It looks like the issue is an index established earlier on
commentable_id and commentable_type - Oracle appears to be *copying*
the whole deal to a temporary table (altered_comments) along with the
indexes. I suspect the only solution would be to shorten the name of
the index on the original table before doing the change_column...

--Matt Jones