discourse/db/migrate/20120720013733_add_username...

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class AddUsernameLowerToUsers < ActiveRecord::Migration
def up
add_column :users, :username_lower, :string, limit: 20
execute "update users set username_lower = lower(username)"
add_index :users, [:username_lower], unique: true
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change_column :users, :username_lower, :string, limit: 20, null: false
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end
def down
remove_column :users, :username_lower
end
end