discourse/app/services/tracked_topics_updater.rb

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class TrackedTopicsUpdater
def initialize(user_id, threshold)
@id = user_id
@threshold = threshold
end
def call
topic_users = TopicUser.where(notifications_reason_id: nil, user_id: @id)
if @threshold < 0
topic_users.update_all({notification_level: TopicUser.notification_levels[:regular]})
else
topic_users.update_all(["notification_level = CASE WHEN total_msecs_viewed < ? THEN ? ELSE ? END",
@threshold, TopicUser.notification_levels[:regular], TopicUser.notification_levels[:tracking]])
end
end
end