discourse/lib/validators/topic_title_length_validato...

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class TopicTitleLengthValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
title_validator(record).validate_each(record, attribute, value)
end
private
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def title_validator(record)
length_range =
if record.user.try(:admin?)
1..SiteSetting.max_topic_title_length
elsif record.private_message?
SiteSetting.private_message_title_length
else
SiteSetting.topic_title_length
end
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ActiveModel::Validations::LengthValidator.new(attributes: :title, in: length_range, allow_blank: true)
end
end