ActiveRecord finding existing table indexes

Question

I am writing a migration generator for a plugin I am writing and I need to to be able to find what unique indexes a table has so I can modify existing unique indexes to become a

Answer 1

This works with MySQL, SQLite3, and Postgres:

ActiveRecord::Base.connection.tables.each do |table|
    puts ActiveRecord::Base.connection.indexes(table).inspect
end

But I think it only gives you the indexes you specifically created.

Also, to find out which adapter is in use:

ActiveRecord::Base.connection.class