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

If you are using PostgreSQL you can change your column type to citext - case-insensitive string. It also makes search independent from the register.

def change
  enable_extension :citext
  change_column :users, :email, :citext
  add_index :users, :email, unique: true
end