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mastodon
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mastodon/app/validators/unique_username_validator.rb

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# frozen_string_literal: true
# See also: USERNAME_RE in the Account class
class UniqueUsernameValidator < ActiveModel::Validator
def validate(account)
return if account.username.nil?
normalized_username = account.username.downcase
scope = Account.where(domain: nil).where('lower(username) = ?', normalized_username)
scope = scope.where.not(id: account.id) if account.persisted?
account.errors.add(:username, :taken) if scope.exists?
end
end