Halvor Heuch wrote in post #949981:
could someone please tell me how I can add a Mysql table index through
my rails app. without using a migration, ie from within my app ?
Why would you even want to do that? Normally the migrations are the
only part of your code that should change your DB schema, so I suspect
that you've either got very unusual needs or a design problem.
What are you ultimately trying to achieve here?