discourse/lib/validators/username_setting_validator.rb

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# frozen_string_literal: true
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class UsernameSettingValidator
include RegexSettingValidation
def initialize(opts = {})
@opts = opts
initialize_regex_opts(opts)
end
def valid_value?(val)
!val.present? || (User.where(username: val).exists? && regex_match?(val))
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end
def error_message
if @regex_fail
I18n.t(@regex_error)
else
I18n.t('site_settings.errors.invalid_username')
end
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end
end