How to create a migration to remove an index only if it exists, rather than throwing an exception if it doesn't?

Question

Right now, the current migration might fail, if the books table doesn\'t have created_at or updated_at fields:

class AddTi         


        

Answer 1

There is also index_name_exists?(table_name, index_name) method which let's you check for an index by it's name. It's helpful for checking for existence of multi-column indexes.

Documentation - index_name_exists