discourse/lib/validators/max_username_length_validat...

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class MaxUsernameLengthValidator
def initialize(opts = {})
@opts = opts
end
def valid_value?(value)
return false if value < SiteSetting.min_username_length
@username = User.where('length(username) > ?', value).pluck(:username).first
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@username.blank?
end
def error_message
if @username.blank?
I18n.t("site_settings.errors.max_username_length_range")
else
I18n.t("site_settings.errors.max_username_length_exists", username: @username)
end
end
end