Case-insensitive unique index in Rails/ActiveRecord?

Question

I need to create a case-insensitive index on a column in rails. I did this via SQL:

execute(
   \"CREATE UNIQUE INDEX index_users_on_lower_email_index 
    O         


        

Answer 1

I would simplify this...

In your model:

before_validation :downcase_email

def downcase_email
  self.email = email.downcase
end

That way, the index is database agnostic, and your emails are all lowercase in the database.