discourse/app/models/topic_user.rb

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class TopicUser < ActiveRecord::Base
belongs_to :user
belongs_to :topic
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scope :starred_since, lambda { |sinceDaysAgo| where('starred_at > ?', sinceDaysAgo.days.ago) }
scope :by_date_starred, -> { group('date(starred_at)').order('date(starred_at)') }
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scope :tracking, lambda { |topic_id|
where(topic_id: topic_id)
.where("COALESCE(topic_users.notification_level, :regular) >= :tracking",
regular: TopicUser.notification_levels[:regular], tracking: TopicUser.notification_levels[:tracking])
}
# Class methods
class << self
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# Enums
def notification_levels
@notification_levels ||= Enum.new(:muted, :regular, :tracking, :watching, start: 0)
end
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def notification_reasons
@notification_reasons ||= Enum.new(
:created_topic,
:user_changed,
:user_interacted,
:created_post,
:auto_watch,
:auto_watch_category,
:auto_mute_category
)
end
def auto_track(user_id, topic_id, reason)
if TopicUser.where(user_id: user_id, topic_id: topic_id, notifications_reason_id: nil).exists?
change(user_id, topic_id,
notification_level: notification_levels[:tracking],
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notifications_reason_id: reason
)
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MessageBus.publish("/topic/#{topic_id}", {
notification_level_change: notification_levels[:tracking],
notifications_reason_id: reason
}, user_ids: [user_id])
end
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end
# Find the information specific to a user in a forum topic
def lookup_for(user, topics)
# If the user isn't logged in, there's no last read posts
return {} if user.blank? || topics.blank?
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topic_ids = topics.map(&:id)
create_lookup(TopicUser.where(topic_id: topic_ids, user_id: user.id))
end
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def create_lookup(topic_users)
topic_users = topic_users.to_a
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result = {}
return result if topic_users.blank?
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topic_users.each do |ftu|
result[ftu.topic_id] = ftu
end
result
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end
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def get(topic, user)
topic = topic.id if topic.is_a?(Topic)
user = user.id if user.is_a?(User)
TopicUser.find_by(topic_id: topic, user_id: user)
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end
# Change attributes for a user (creates a record when none is present). First it tries an update
# since there's more likely to be an existing record than not. If the update returns 0 rows affected
# it then creates the row instead.
def change(user_id, topic_id, attrs)
# Sometimes people pass objs instead of the ids. We can handle that.
topic_id = topic_id.id if topic_id.is_a?(::Topic)
user_id = user_id.id if user_id.is_a?(::User)
topic_id = topic_id.to_i
user_id = user_id.to_i
TopicUser.transaction do
attrs = attrs.dup
attrs[:starred_at] = DateTime.now if attrs[:starred_at].nil? && attrs[:starred]
if attrs[:notification_level]
attrs[:notifications_changed_at] ||= DateTime.now
attrs[:notifications_reason_id] ||= TopicUser.notification_reasons[:user_changed]
end
attrs_array = attrs.to_a
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attrs_sql = attrs_array.map { |t| "#{t[0]} = ?" }.join(", ")
vals = attrs_array.map { |t| t[1] }
rows = TopicUser.where(topic_id: topic_id, user_id: user_id).update_all([attrs_sql, *vals])
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if rows == 0
now = DateTime.now
auto_track_after = User.select(:auto_track_topics_after_msecs).find_by(id: user_id).auto_track_topics_after_msecs
auto_track_after ||= SiteSetting.auto_track_topics_after
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if auto_track_after >= 0 && auto_track_after <= (attrs[:total_msecs_viewed] || 0)
attrs[:notification_level] ||= notification_levels[:tracking]
end
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TopicUser.create(attrs.merge!(user_id: user_id, topic_id: topic_id, first_visited_at: now ,last_visited_at: now))
else
observe_after_save_callbacks_for topic_id, user_id
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end
end
rescue ActiveRecord::RecordNotUnique
# In case of a race condition to insert, do nothing
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end
def track_visit!(topic,user)
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topic_id = topic.is_a?(Topic) ? topic.id : topic
user_id = user.is_a?(User) ? user.id : topic
now = DateTime.now
rows = TopicUser.where({topic_id: topic_id, user_id: user_id}).update_all({last_visited_at: now})
if rows == 0
TopicUser.create(topic_id: topic_id, user_id: user_id, last_visited_at: now, first_visited_at: now)
else
observe_after_save_callbacks_for topic_id, user_id
end
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end
# Update the last read and the last seen post count, but only if it doesn't exist.
# This would be a lot easier if psql supported some kind of upsert
def update_last_read(user, topic_id, post_number, msecs)
return if post_number.blank?
msecs = 0 if msecs.to_i < 0
args = {
user_id: user.id,
topic_id: topic_id,
post_number: post_number,
now: DateTime.now,
msecs: msecs,
tracking: notification_levels[:tracking],
threshold: SiteSetting.auto_track_topics_after
}
# In case anyone seens "seen_post_count" and gets confused, like I do.
# seen_post_count represents the highest_post_number of the topic when
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# the user visited it. It may be out of alignment with last_read, meaning
# ... user visited the topic but did not read the posts
rows = exec_sql("UPDATE topic_users
SET
last_read_post_number = greatest(:post_number, tu.last_read_post_number),
seen_post_count = t.highest_post_number,
total_msecs_viewed = tu.total_msecs_viewed + :msecs,
notification_level =
case when tu.notifications_reason_id is null and (tu.total_msecs_viewed + :msecs) >
coalesce(u.auto_track_topics_after_msecs,:threshold) and
coalesce(u.auto_track_topics_after_msecs, :threshold) >= 0 then
:tracking
else
tu.notification_level
end
FROM topic_users tu
join topics t on t.id = tu.topic_id
join users u on u.id = :user_id
WHERE
tu.topic_id = topic_users.topic_id AND
tu.user_id = topic_users.user_id AND
tu.topic_id = :topic_id AND
tu.user_id = :user_id
RETURNING
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topic_users.notification_level, tu.notification_level old_level, tu.last_read_post_number
",
args).values
if rows.length == 1
before = rows[0][1].to_i
after = rows[0][0].to_i
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before_last_read = rows[0][2].to_i
if before_last_read < post_number
# The user read at least one new post
TopicTrackingState.publish_read(topic_id, post_number, user.id, after)
user.update_posts_read!(post_number - before_last_read)
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end
if before != after
MessageBus.publish("/topic/#{topic_id}", {notification_level_change: after}, user_ids: [user.id])
end
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end
if rows.length == 0
# The user read at least one post in a topic that they haven't viewed before.
args[:new_status] = notification_levels[:regular]
if (user.auto_track_topics_after_msecs || SiteSetting.auto_track_topics_after) == 0
args[:new_status] = notification_levels[:tracking]
end
TopicTrackingState.publish_read(topic_id, post_number, user.id, args[:new_status])
user.update_posts_read!(post_number)
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exec_sql("INSERT INTO topic_users (user_id, topic_id, last_read_post_number, seen_post_count, last_visited_at, first_visited_at, notification_level)
SELECT :user_id, :topic_id, :post_number, ft.highest_post_number, :now, :now, :new_status
FROM topics AS ft
JOIN users u on u.id = :user_id
WHERE ft.id = :topic_id
AND NOT EXISTS(SELECT 1
FROM topic_users AS ftu
WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)",
args)
end
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end
def observe_after_save_callbacks_for(topic_id, user_id)
TopicUser.where(topic_id: topic_id, user_id: user_id).each do |topic_user|
UserActionObserver.instance.after_save topic_user
end
end
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end
def self.ensure_consistency!(topic_id=nil)
builder = SqlBuilder.new <<SQL
UPDATE topic_users t
SET
last_read_post_number = last_read,
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seen_post_count = LEAST(max_post_number,GREATEST(t.seen_post_count, last_read))
FROM (
SELECT topic_id, user_id, MAX(post_number) last_read
FROM post_timings
GROUP BY topic_id, user_id
) as X
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JOIN (
SELECT p.topic_id, MAX(p.post_number) max_post_number from posts p
GROUP BY p.topic_id
) as Y on Y.topic_id = X.topic_id
/*where*/
SQL
builder.where <<SQL
X.topic_id = t.topic_id AND
X.user_id = t.user_id AND
(
last_read_post_number <> last_read OR
seen_post_count <> LEAST(max_post_number,GREATEST(t.seen_post_count, last_read))
)
SQL
if topic_id
builder.where("t.topic_id = :topic_id", topic_id: topic_id)
end
builder.exec
end
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end
# == Schema Information
#
# Table name: topic_users
#
# user_id :integer not null
# topic_id :integer not null
# starred :boolean default(FALSE), not null
# posted :boolean default(FALSE), not null
# last_read_post_number :integer
# seen_post_count :integer
# starred_at :datetime
# last_visited_at :datetime
# first_visited_at :datetime
# notification_level :integer default(1), not null
# notifications_changed_at :datetime
# notifications_reason_id :integer
# total_msecs_viewed :integer default(0), not null
# cleared_pinned_at :datetime
# unstarred_at :datetime
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# id :integer not null, primary key
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# last_emailed_post_number :integer
#
# Indexes
#
# index_forum_thread_users_on_forum_thread_id_and_user_id (topic_id,user_id) UNIQUE
#