How do I make a column unique and index it in a Ruby on Rails migration?

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I would like to make a column unique in Ruby on Rails migration script. What is the best way to do it? Also is there a way to index a column in a table?

I would like to enforce unique columns in a database as opposed to just using :validate_uniqueness_of.

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How do I make a column unique and index it in a Ruby on Rails migration?

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