discourse/lib/unread.rb

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class Unread
# This module helps us calculate unread and new post counts
def initialize(topic, topic_user)
@topic = topic
@topic_user = topic_user
end
def unread_posts
return 0 if do_not_notify?(@topic_user.notification_level)
result = ((@topic_user.seen_post_count||0) - (@topic_user.last_read_post_number||0))
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result = 0 if result < 0
result
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end
def new_posts
return 0 if @topic_user.seen_post_count.blank?
return 0 if do_not_notify?(@topic_user.notification_level)
new_posts = (@topic.highest_post_number - @topic_user.seen_post_count)
new_posts = 0 if new_posts < 0
return new_posts
end
protected
def do_not_notify?(notification_level)
[TopicUser::NotificationLevel::MUTED, TopicUser::NotificationLevel::REGULAR].include?(notification_level)
end
end