discourse/app/models/topic.rb

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require_dependency 'slug'
require_dependency 'avatar_lookup'
require_dependency 'topic_view'
require_dependency 'rate_limiter'
require_dependency 'text_sentinel'
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class Topic < ActiveRecord::Base
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include ActionView::Helpers
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include RateLimiter::OnCreateRecord
def self.max_sort_order
2**31 - 1
end
def self.featured_users_count
4
end
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versioned if: :new_version_required?
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acts_as_paranoid
after_recover :update_flagged_posts_count
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after_destroy :update_flagged_posts_count
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rate_limit :default_rate_limiter
rate_limit :limit_topics_per_day
rate_limit :limit_private_messages_per_day
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validate :title_quality
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validates_presence_of :title
validates :title, length: { in: SiteSetting.topic_title_length }
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serialize :meta_data, ActiveRecord::Coders::Hstore
validate :unique_title
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belongs_to :category
has_many :posts
has_many :topic_allowed_users
has_many :allowed_users, through: :topic_allowed_users, source: :user
has_one :hot_topic
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belongs_to :user
belongs_to :last_poster, class_name: 'User', foreign_key: :last_post_user_id
belongs_to :featured_user1, class_name: 'User', foreign_key: :featured_user1_id
belongs_to :featured_user2, class_name: 'User', foreign_key: :featured_user2_id
belongs_to :featured_user3, class_name: 'User', foreign_key: :featured_user3_id
belongs_to :featured_user4, class_name: 'User', foreign_key: :featured_user4_id
has_many :topic_users
has_many :topic_links
has_many :topic_invites
has_many :invites, through: :topic_invites, source: :invite
# When we want to temporarily attach some data to a forum topic (usually before serialization)
attr_accessor :user_data
attr_accessor :posters # TODO: can replace with posters_summary once we remove old list code
# The regular order
scope :topic_list_order, lambda { order('topics.bumped_at desc') }
# Return private message topics
scope :private_messages, lambda {
where(archetype: Archetype::private_message)
}
scope :listable_topics, lambda { where('topics.archetype <> ?', [Archetype.private_message]) }
scope :by_newest, order('created_at desc, id desc')
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# Helps us limit how many favorites can be made in a day
class FavoriteLimiter < RateLimiter
def initialize(user)
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super(user, "favorited:#{Date.today.to_s}", SiteSetting.max_favorites_per_day, 1.day.to_i)
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end
end
before_validation do
if title.present?
self.title = sanitize(title, tags: [], attributes: [])
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self.title.strip!
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end
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end
before_create do
self.bumped_at ||= Time.now
self.last_post_user_id ||= user_id
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end
after_create do
changed_to_category(category)
TopicUser.change(user_id, id,
notification_level: TopicUser.notification_levels[:watching],
notifications_reason_id: TopicUser.notification_reasons[:created_topic])
if archetype == Archetype.private_message
DraftSequence.next!(user, Draft::NEW_PRIVATE_MESSAGE)
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else
DraftSequence.next!(user, Draft::NEW_TOPIC)
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end
end
# Additional rate limits on topics: per day and private messages per day
def limit_topics_per_day
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RateLimiter.new(user, "topics-per-day:#{Date.today.to_s}", SiteSetting.max_topics_per_day, 1.day.to_i)
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end
def limit_private_messages_per_day
return unless private_message?
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RateLimiter.new(user, "pms-per-day:#{Date.today.to_s}", SiteSetting.max_private_messages_per_day, 1.day.to_i)
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end
# Validate unique titles if a site setting is set
def unique_title
return if SiteSetting.allow_duplicate_topic_titles?
# Let presence validation catch it if it's blank
return if title.blank?
# Private messages can be called whatever they want
return if private_message?
finder = Topic.listable_topics.where("lower(title) = ?", title.downcase)
finder = finder.where("id != ?", self.id) if self.id.present?
errors.add(:title, I18n.t(:has_already_been_used)) if finder.exists?
end
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def fancy_title
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return title unless SiteSetting.title_fancy_entities?
# We don't always have to require this, if fancy is disabled
# see: http://meta.discourse.org/t/pattern-for-defer-loading-gems-and-profiling-with-perftools-rb/4629
require 'redcarpet' unless defined? Redcarpet
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Redcarpet::Render::SmartyPants.render(title)
end
def title_quality
# We don't care about quality on private messages
return if private_message?
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sentinel = TextSentinel.title_sentinel(title)
if sentinel.valid?
# It's possible the sentinel has cleaned up the title a bit
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self.title = sentinel.text
else
errors.add(:title, I18n.t(:is_invalid))
end
end
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def new_version_required?
title_changed? || category_id_changed?
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end
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# Returns new topics since a date for display in email digest.
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def self.new_topics(since)
Topic
.visible
.where(closed: false, archived: false)
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.created_since(since)
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.listable_topics
.topic_list_order
.includes(:user)
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.limit(5)
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end
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def update_meta_data(data)
self.meta_data = (self.meta_data || {}).merge(data.stringify_keys)
save
end
def post_numbers
@post_numbers ||= posts.order(:post_number).pluck(:post_number)
end
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def has_meta_data_boolean?(key)
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meta_data_string(key) == 'true'
end
def meta_data_string(key)
return unless meta_data.present?
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meta_data[key.to_s]
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end
def self.visible
where(visible: true)
end
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def self.created_since(time_ago)
where("created_at > ?", time_ago)
end
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def self.count_per_day(since=30.days.ago)
where('created_at > ?', since).group('date(created_at)').order('date(created_at)').count
end
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def private_message?
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self.archetype == Archetype.private_message
end
def links_grouped
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exec_sql("SELECT ftl.url,
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ft.title,
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ftl.link_topic_id,
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ftl.reflection,
ftl.internal,
MIN(ftl.user_id) AS user_id,
SUM(clicks) AS clicks
FROM topic_links AS ftl
LEFT OUTER JOIN topics AS ft ON ftl.link_topic_id = ft.id
WHERE ftl.topic_id = ?
GROUP BY ftl.url, ft.title, ftl.link_topic_id, ftl.reflection, ftl.internal
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ORDER BY clicks DESC",
id).to_a
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end
# Search for similar topics
def self.similar_to(title, raw)
return [] unless title.present?
return [] unless raw.present?
# For now, we only match on title. We'll probably add body later on, hence the API hook
Topic.select(sanitize_sql_array(["topics.*, similarity(topics.title, :title) AS similarity", title: title]))
.visible
.where(closed: false, archived: false)
.listable_topics
.limit(SiteSetting.max_similar_results)
.order('similarity desc')
.all
end
def update_status(property, status, user)
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Topic.transaction do
# Special case: if it's pinned, update that
if property.to_sym == :pinned
update_pinned(status)
else
# otherwise update the column
update_column(property, status)
end
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key = "topic_statuses.#{property}_"
key << (status ? 'enabled' : 'disabled')
opts = {}
# We don't bump moderator posts except for the re-open post.
opts[:bump] = true if property == 'closed' and (!status)
add_moderator_post(user, I18n.t(key), opts)
end
end
# Atomically creates the next post number
def self.next_post_number(topic_id, reply = false)
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highest = exec_sql("select coalesce(max(post_number),0) as max from posts where topic_id = ?", topic_id).first['max'].to_i
reply_sql = reply ? ", reply_count = reply_count + 1" : ""
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result = exec_sql("UPDATE topics SET highest_post_number = ? + 1#{reply_sql}
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WHERE id = ? RETURNING highest_post_number", highest, topic_id)
result.first['highest_post_number'].to_i
end
# If a post is deleted we have to update our highest post counters
def self.reset_highest(topic_id)
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result = exec_sql "UPDATE topics
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SET highest_post_number = (SELECT COALESCE(MAX(post_number), 0) FROM posts WHERE topic_id = :topic_id AND deleted_at IS NULL),
posts_count = (SELECT count(*) FROM posts WHERE deleted_at IS NULL AND topic_id = :topic_id)
WHERE id = :topic_id
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RETURNING highest_post_number", topic_id: topic_id
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highest_post_number = result.first['highest_post_number'].to_i
# Update the forum topic user records
exec_sql "UPDATE topic_users
SET last_read_post_number = CASE
WHEN last_read_post_number > :highest THEN :highest
ELSE last_read_post_number
END,
seen_post_count = CASE
WHEN seen_post_count > :highest THEN :highest
ELSE seen_post_count
END
WHERE topic_id = :topic_id",
highest: highest_post_number,
topic_id: topic_id
end
# This calculates the geometric mean of the posts and stores it with the topic
def self.calculate_avg_time
exec_sql("UPDATE topics
SET avg_time = x.gmean
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FROM (SELECT topic_id,
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round(exp(avg(ln(avg_time)))) AS gmean
FROM posts
GROUP BY topic_id) AS x
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WHERE x.topic_id = topics.id")
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end
def changed_to_category(cat)
return if cat.blank?
return if Category.where(topic_id: id).first.present?
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Topic.transaction do
old_category = category
if category_id.present? && category_id != cat.id
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Category.update_all 'topic_count = topic_count - 1', ['id = ?', category_id]
end
self.category_id = cat.id
save
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CategoryFeaturedTopic.feature_topics_for(old_category)
Category.update_all 'topic_count = topic_count + 1', id: cat.id
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CategoryFeaturedTopic.feature_topics_for(cat) unless old_category.try(:id) == cat.try(:id)
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end
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end
def add_moderator_post(user, text, opts={})
new_post = nil
Topic.transaction do
creator = PostCreator.new(user,
raw: text,
post_type: Post.types[:moderator_action],
no_bump: opts[:bump].blank?,
topic_id: self.id)
new_post = creator.create
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increment!(:moderator_posts_count)
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new_post
end
if new_post.present?
# If we are moving posts, we want to insert the moderator post where the previous posts were
# in the stream, not at the end.
new_post.update_attributes(post_number: opts[:post_number], sort_order: opts[:post_number]) if opts[:post_number].present?
# Grab any links that are present
TopicLink.extract_from(new_post)
end
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new_post
end
# Changes the category to a new name
def change_category(name)
# If the category name is blank, reset the attribute
if name.blank?
if category_id.present?
CategoryFeaturedTopic.feature_topics_for(category)
Category.update_all 'topic_count = topic_count - 1', id: category_id
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end
self.category_id = nil
save
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return
end
cat = Category.where(name: name).first
return if cat == category
changed_to_category(cat)
end
def featured_user_ids
[featured_user1_id, featured_user2_id, featured_user3_id, featured_user4_id].uniq.compact
end
# Invite a user to the topic by username or email. Returns success/failure
def invite(invited_by, username_or_email)
if private_message?
# If the user exists, add them to the topic.
user = User.find_by_username_or_email(username_or_email).first
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if user.present?
if topic_allowed_users.create!(user_id: user.id)
# Notify the user they've been invited
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user.notifications.create(notification_type: Notification.types[:invited_to_private_message],
topic_id: id,
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post_number: 1,
data: { topic_title: title,
display_username: invited_by.username }.to_json)
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return true
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end
elsif username_or_email =~ /^.+@.+$/
# If the user doesn't exist, but it looks like an email, invite the user by email.
return invite_by_email(invited_by, username_or_email)
end
else
# Success is whether the invite was created
return invite_by_email(invited_by, username_or_email).present?
end
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false
end
# Invite a user by email and return the invite. Return the previously existing invite
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# if already exists. Returns nil if the invite can't be created.
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def invite_by_email(invited_by, email)
lower_email = email.downcase
invite = Invite.with_deleted.where('invited_by_id = ? and email = ?', invited_by.id, lower_email).first
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if invite.blank?
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invite = Invite.create(invited_by: invited_by, email: lower_email)
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unless invite.valid?
# If the email already exists, grant permission to that user
if invite.email_already_exists and private_message?
user = User.where(email: lower_email).first
topic_allowed_users.create!(user_id: user.id)
end
return
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end
end
# Recover deleted invites if we invite them again
invite.recover if invite.deleted_at.present?
topic_invites.create(invite_id: invite.id)
Jobs.enqueue(:invite_email, invite_id: invite.id)
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invite
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end
def move_posts(moved_by, new_title, post_ids)
topic = nil
first_post_number = nil
Topic.transaction do
topic = Topic.create(user: moved_by, title: new_title, category: category)
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to_move = posts.where(id: post_ids).order(:created_at)
raise Discourse::InvalidParameters.new(:post_ids) if to_move.blank?
to_move.each_with_index do |post, i|
first_post_number ||= post.post_number
row_count = Post.update_all ["post_number = :post_number, topic_id = :topic_id, sort_order = :post_number", post_number: i+1, topic_id: topic.id], id: post.id, topic_id: id
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# We raise an error if any of the posts can't be moved
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raise Discourse::InvalidParameters.new(:post_ids) if row_count == 0
end
# Update denormalized values since we've manually moved stuff
end
# Add a moderator post explaining that the post was moved
if topic.present?
topic_url = "#{Discourse.base_url}#{topic.relative_url}"
topic_link = "[#{new_title}](#{topic_url})"
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add_moderator_post(moved_by, I18n.t("move_posts.moderator_post", count: post_ids.size, topic_link: topic_link), post_number: first_post_number)
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Jobs.enqueue(:notify_moved_posts, post_ids: post_ids, moved_by_id: moved_by.id)
topic.update_statistics
update_statistics
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end
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topic
end
# Updates the denormalized statistics of a topic including featured posters. They shouldn't
# go out of sync unless you do something drastic live move posts from one topic to another.
# this recalculates everything.
def update_statistics
feature_topic_users
update_action_counts
Topic.reset_highest(id)
end
def update_flagged_posts_count
PostAction.update_flagged_posts_count
end
def update_action_counts
PostActionType.types.keys.each do |type|
count_field = "#{type}_count"
update_column(count_field, Post.where(topic_id: id).sum(count_field))
end
end
# Chooses which topic users to feature
def feature_topic_users(args={})
reload
to_feature = posts
# Don't include the OP or the last poster
to_feature = to_feature.where('user_id NOT IN (?, ?)', user_id, last_post_user_id)
# Exclude a given post if supplied (in the case of deletes)
to_feature = to_feature.where("id <> ?", args[:except_post_id]) if args[:except_post_id].present?
# Clear the featured users by default
Topic.featured_users_count.times do |i|
send("featured_user#{i+1}_id=", nil)
end
# Assign the featured_user{x} columns
to_feature = to_feature.group(:user_id).order('count_all desc').limit(Topic.featured_users_count)
to_feature.count.keys.each_with_index do |user_id, i|
send("featured_user#{i+1}_id=", user_id)
end
save
end
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# Create the summary of the interesting posters in a topic. Cheats to avoid
# many queries.
def posters_summary(topic_user = nil, current_user = nil, opts={})
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return @posters_summary if @posters_summary.present?
descriptions = {}
# Use an avatar lookup object if we have it, otherwise create one just for this forum topic
al = opts[:avatar_lookup]
if al.blank?
al = AvatarLookup.new([user_id, last_post_user_id, featured_user1_id, featured_user2_id, featured_user3_id])
end
# Helps us add a description to a poster
add_description = lambda do |u, desc|
if u.present?
descriptions[u.id] ||= []
descriptions[u.id] << I18n.t(desc)
end
end
posted = if topic_user.present? && current_user.present?
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current_user if topic_user.posted?
end
add_description.call(current_user, :youve_posted) if posted.present?
add_description.call(al[user_id], :original_poster)
add_description.call(al[featured_user1_id], :most_posts)
add_description.call(al[featured_user2_id], :frequent_poster)
add_description.call(al[featured_user3_id], :frequent_poster)
add_description.call(al[featured_user4_id], :frequent_poster)
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add_description.call(al[last_post_user_id], :most_recent_poster)
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@posters_summary = [al[user_id],
posted,
al[last_post_user_id],
al[featured_user1_id],
al[featured_user2_id],
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al[featured_user3_id],
al[featured_user4_id]
].compact.uniq[0..4]
unless @posters_summary[0] == al[last_post_user_id]
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# shuffle last_poster to back
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@posters_summary.reject!{|u| u == al[last_post_user_id]}
@posters_summary << al[last_post_user_id]
end
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@posters_summary.map! do |p|
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result = TopicPoster.new
result.user = p
result.description = descriptions[p.id].join(', ')
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result.extras = "latest" if al[last_post_user_id] == p
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result
end
@posters_summary
end
# Enable/disable the star on the topic
def toggle_star(user, starred)
Topic.transaction do
TopicUser.change(user, id, starred: starred, starred_at: starred ? DateTime.now : nil)
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# Update the star count
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exec_sql "UPDATE topics
SET star_count = (SELECT COUNT(*)
FROM topic_users AS ftu
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WHERE ftu.topic_id = topics.id
AND ftu.starred = true)
WHERE id = ?", id
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if starred
FavoriteLimiter.new(user).performed!
else
FavoriteLimiter.new(user).rollback!
end
end
end
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# Enable/disable the mute on the topic
def toggle_mute(user, muted)
TopicUser.change(user, self.id, notification_level: muted?(user) ? TopicUser.notification_levels[:regular] : TopicUser.notification_levels[:muted] )
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end
def slug
Slug.for(title).presence || "topic"
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end
def last_post_url
"/t/#{slug}/#{id}/#{posts_count}"
end
def relative_url(post_number=nil)
url = "/t/#{slug}/#{id}"
url << "/#{post_number}" if post_number.present? && post_number.to_i > 1
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url
end
def muted?(user)
return false unless user && user.id
tu = topic_users.where(user_id: user.id).first
tu && tu.notification_level == TopicUser.notification_levels[:muted]
end
def clear_pin_for(user)
return unless user.present?
TopicUser.change(user.id, id, cleared_pinned_at: Time.now)
end
def update_pinned(status)
update_column(:pinned_at, status ? Time.now : nil)
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end
def draft_key
"#{Draft::EXISTING_TOPIC}#{id}"
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end
# notification stuff
def notify_watch!(user)
TopicUser.change(user, id, notification_level: TopicUser.notification_levels[:watching])
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end
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def notify_tracking!(user)
TopicUser.change(user, id, notification_level: TopicUser.notification_levels[:tracking])
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end
def notify_regular!(user)
TopicUser.change(user, id, notification_level: TopicUser.notification_levels[:regular])
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end
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def notify_muted!(user)
TopicUser.change(user, id, notification_level: TopicUser.notification_levels[:muted])
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end
end