351 lines
13 KiB
Ruby
351 lines
13 KiB
Ruby
class TopicUser < ActiveRecord::Base
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belongs_to :user
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belongs_to :topic
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# used for serialization
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attr_accessor :post_action_data
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scope :tracking, lambda { |topic_id|
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where(topic_id: topic_id)
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.where("COALESCE(topic_users.notification_level, :regular) >= :tracking",
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regular: TopicUser.notification_levels[:regular], tracking: TopicUser.notification_levels[:tracking])
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}
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# Class methods
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class << self
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# Enums
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def notification_levels
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@notification_levels ||= Enum.new(:muted, :regular, :tracking, :watching, start: 0)
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end
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def notification_reasons
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@notification_reasons ||= Enum.new(
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:created_topic,
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:user_changed,
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:user_interacted,
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:created_post,
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:auto_watch,
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:auto_watch_category,
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:auto_mute_category,
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:auto_track_category
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)
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end
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def auto_track(user_id, topic_id, reason)
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if TopicUser.where(user_id: user_id, topic_id: topic_id, notifications_reason_id: nil).exists?
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change(user_id, topic_id,
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notification_level: notification_levels[:tracking],
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notifications_reason_id: reason
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)
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MessageBus.publish("/topic/#{topic_id}", {
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notification_level_change: notification_levels[:tracking],
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notifications_reason_id: reason
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}, user_ids: [user_id])
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end
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end
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# Find the information specific to a user in a forum topic
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def lookup_for(user, topics)
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# If the user isn't logged in, there's no last read posts
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return {} if user.blank? || topics.blank?
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topic_ids = topics.map(&:id)
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create_lookup(TopicUser.where(topic_id: topic_ids, user_id: user.id))
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end
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def create_lookup(topic_users)
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topic_users = topic_users.to_a
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result = {}
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return result if topic_users.blank?
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topic_users.each do |ftu|
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result[ftu.topic_id] = ftu
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end
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result
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end
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def get(topic, user)
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topic = topic.id if topic.is_a?(Topic)
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user = user.id if user.is_a?(User)
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TopicUser.find_by(topic_id: topic, user_id: user)
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end
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# Change attributes for a user (creates a record when none is present). First it tries an update
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# since there's more likely to be an existing record than not. If the update returns 0 rows affected
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# it then creates the row instead.
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def change(user_id, topic_id, attrs)
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# Sometimes people pass objs instead of the ids. We can handle that.
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topic_id = topic_id.id if topic_id.is_a?(::Topic)
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user_id = user_id.id if user_id.is_a?(::User)
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topic_id = topic_id.to_i
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user_id = user_id.to_i
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TopicUser.transaction do
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attrs = attrs.dup
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if attrs[:notification_level]
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attrs[:notifications_changed_at] ||= DateTime.now
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attrs[:notifications_reason_id] ||= TopicUser.notification_reasons[:user_changed]
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end
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attrs_array = attrs.to_a
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attrs_sql = attrs_array.map { |t| "#{t[0]} = ?" }.join(", ")
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vals = attrs_array.map { |t| t[1] }
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rows = TopicUser.where(topic_id: topic_id, user_id: user_id).update_all([attrs_sql, *vals])
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if rows == 0
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now = DateTime.now
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auto_track_after = User.select(:auto_track_topics_after_msecs).find_by(id: user_id).auto_track_topics_after_msecs
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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)
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attrs[:notification_level] ||= notification_levels[:tracking]
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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))
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else
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observe_after_save_callbacks_for topic_id, user_id
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end
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end
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if attrs[:notification_level]
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MessageBus.publish("/topic/#{topic_id}",
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{notification_level_change: attrs[:notification_level]}, user_ids: [user_id])
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end
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rescue ActiveRecord::RecordNotUnique
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# In case of a race condition to insert, do nothing
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end
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def track_visit!(topic,user)
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topic_id = topic.is_a?(Topic) ? topic.id : topic
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user_id = user.is_a?(User) ? user.id : topic
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now = DateTime.now
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rows = TopicUser.where({topic_id: topic_id, user_id: user_id}).update_all({last_visited_at: now})
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if rows == 0
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TopicUser.create(topic_id: topic_id, user_id: user_id, last_visited_at: now, first_visited_at: now)
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else
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observe_after_save_callbacks_for topic_id, user_id
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end
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end
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# Update the last read and the last seen post count, but only if it doesn't exist.
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# This would be a lot easier if psql supported some kind of upsert
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def update_last_read(user, topic_id, post_number, msecs)
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return if post_number.blank?
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msecs = 0 if msecs.to_i < 0
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args = {
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user_id: user.id,
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topic_id: topic_id,
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post_number: post_number,
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now: DateTime.now,
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msecs: msecs,
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tracking: notification_levels[:tracking],
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threshold: SiteSetting.auto_track_topics_after
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}
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# In case anyone seens "highest_seen_post_number" and gets confused, like I do.
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# highest_seen_post_number 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
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# ... user visited the topic but did not read the posts
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#
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# 86400000 = 1 day
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rows = exec_sql("UPDATE topic_users
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SET
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last_read_post_number = GREATEST(:post_number, tu.last_read_post_number),
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highest_seen_post_number = t.highest_post_number,
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total_msecs_viewed = LEAST(tu.total_msecs_viewed + :msecs,86400000),
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notification_level =
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case when tu.notifications_reason_id is null and (tu.total_msecs_viewed + :msecs) >
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coalesce(u.auto_track_topics_after_msecs,:threshold) and
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coalesce(u.auto_track_topics_after_msecs, :threshold) >= 0 then
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:tracking
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else
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tu.notification_level
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end
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FROM topic_users tu
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join topics t on t.id = tu.topic_id
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join users u on u.id = :user_id
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WHERE
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tu.topic_id = topic_users.topic_id AND
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tu.user_id = topic_users.user_id AND
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tu.topic_id = :topic_id AND
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tu.user_id = :user_id
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RETURNING
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topic_users.notification_level, tu.notification_level old_level, tu.last_read_post_number
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",
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args).values
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if rows.length == 1
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before = rows[0][1].to_i
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after = rows[0][0].to_i
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before_last_read = rows[0][2].to_i
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if before_last_read < post_number
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# The user read at least one new post
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TopicTrackingState.publish_read(topic_id, post_number, user.id, after)
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user.update_posts_read!(post_number - before_last_read)
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end
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if before != after
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MessageBus.publish("/topic/#{topic_id}", {notification_level_change: after}, user_ids: [user.id])
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end
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end
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if rows.length == 0
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# The user read at least one post in a topic that they haven't viewed before.
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args[:new_status] = notification_levels[:regular]
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if (user.auto_track_topics_after_msecs || SiteSetting.auto_track_topics_after) == 0
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args[:new_status] = notification_levels[:tracking]
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end
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TopicTrackingState.publish_read(topic_id, post_number, user.id, args[:new_status])
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user.update_posts_read!(post_number)
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exec_sql("INSERT INTO topic_users (user_id, topic_id, last_read_post_number, highest_seen_post_number, last_visited_at, first_visited_at, notification_level)
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SELECT :user_id, :topic_id, :post_number, ft.highest_post_number, :now, :now, :new_status
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FROM topics AS ft
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JOIN users u on u.id = :user_id
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WHERE ft.id = :topic_id
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AND NOT EXISTS(SELECT 1
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FROM topic_users AS ftu
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WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)",
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args)
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MessageBus.publish("/topic/#{topic_id}", {notification_level_change: args[:new_status]}, user_ids: [user.id])
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end
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end
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def observe_after_save_callbacks_for(topic_id, user_id)
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TopicUser.where(topic_id: topic_id, user_id: user_id).each do |topic_user|
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UserActionObserver.instance.after_save topic_user
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end
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end
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end
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def self.update_post_action_cache(opts={})
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user_id = opts[:user_id]
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topic_id = opts[:topic_id]
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action_type = opts[:post_action_type]
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action_type_name = "liked" if action_type == :like
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action_type_name = "bookmarked" if action_type == :bookmark
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raise ArgumentError, "action_type" if action_type && !action_type_name
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unless action_type_name
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update_post_action_cache(opts.merge(post_action_type: :like))
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update_post_action_cache(opts.merge(post_action_type: :bookmark))
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return
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end
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builder = SqlBuilder.new <<SQL
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UPDATE topic_users tu
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SET #{action_type_name} = x.state
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FROM (
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SELECT CASE WHEN EXISTS (
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SELECT 1
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FROM post_actions pa
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JOIN posts p on p.id = pa.post_id
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JOIN topics t ON t.id = p.topic_id
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WHERE pa.deleted_at IS NULL AND
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p.deleted_at IS NULL AND
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t.deleted_at IS NULL AND
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pa.post_action_type_id = :action_type_id AND
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tu2.topic_id = t.id AND
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tu2.user_id = pa.user_id
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LIMIT 1
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) THEN true ELSE false END state, tu2.topic_id, tu2.user_id
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FROM topic_users tu2
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/*where*/
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) x
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WHERE x.topic_id = tu.topic_id AND x.user_id = tu.user_id AND x.state != tu.#{action_type_name}
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SQL
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if user_id
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builder.where("tu2.user_id = :user_id", user_id: user_id)
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end
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if topic_id
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builder.where("tu2.topic_id = :topic_id", topic_id: topic_id)
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end
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builder.exec(action_type_id: PostActionType.types[action_type])
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end
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def self.ensure_consistency!(topic_id=nil)
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update_post_action_cache(topic_id: topic_id)
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# TODO this needs some reworking, when we mark stuff skipped
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# we up these numbers so they are not in-sync
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# the simple fix is to add a column here, but table is already quite big
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# long term we want to split up topic_users and allow for this better
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builder = SqlBuilder.new <<SQL
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UPDATE topic_users t
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SET
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last_read_post_number = LEAST(GREATEST(last_read, last_read_post_number), max_post_number),
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highest_seen_post_number = LEAST(max_post_number,GREATEST(t.highest_seen_post_number, last_read))
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FROM (
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SELECT topic_id, user_id, MAX(post_number) last_read
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FROM post_timings
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GROUP BY topic_id, user_id
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) as X
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JOIN (
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SELECT p.topic_id, MAX(p.post_number) max_post_number from posts p
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GROUP BY p.topic_id
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) as Y on Y.topic_id = X.topic_id
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/*where*/
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SQL
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builder.where <<SQL
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X.topic_id = t.topic_id AND
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X.user_id = t.user_id AND
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(
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last_read_post_number <> LEAST(GREATEST(last_read, last_read_post_number), max_post_number) OR
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highest_seen_post_number <> LEAST(max_post_number,GREATEST(t.highest_seen_post_number, last_read))
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)
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SQL
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if topic_id
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builder.where("t.topic_id = :topic_id", topic_id: topic_id)
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end
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builder.exec
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end
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end
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# == Schema Information
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#
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# Table name: topic_users
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#
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# user_id :integer not null
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# topic_id :integer not null
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# posted :boolean default(FALSE), not null
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# last_read_post_number :integer
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# highest_seen_post_number :integer
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# last_visited_at :datetime
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# first_visited_at :datetime
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# notification_level :integer default(1), not null
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# notifications_changed_at :datetime
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# notifications_reason_id :integer
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# total_msecs_viewed :integer default(0), not null
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# cleared_pinned_at :datetime
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# id :integer not null, primary key
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# last_emailed_post_number :integer
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# liked :boolean default(FALSE)
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# bookmarked :boolean default(FALSE)
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#
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# Indexes
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#
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# index_topic_users_on_topic_id_and_user_id (topic_id,user_id) UNIQUE
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# index_topic_users_on_user_id_and_topic_id (user_id,topic_id) UNIQUE
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#
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