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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
normalized_domain = account.domain&.downcase
scope = Account.where(Account.arel_table[:username].lower.eq normalized_username).where(Account.arel_table[:domain].lower.eq normalized_domain)
scope = scope.where.not(id: if account.persisted?
account.errors.add(:username, :taken) if scope.exists?