discourse/lib/topic_query.rb

448 lines
16 KiB
Ruby

#
# Helps us find topics. Returns a TopicList object containing the topics
# found.
#
require_dependency 'topic_list'
require_dependency 'suggested_topics_builder'
require_dependency 'topic_query_sql'
class TopicQuery
# Could be rewritten to %i if Ruby 1.9 is no longer supported
VALID_OPTIONS = %w(except_topic_ids
exclude_category
limit
page
per_page
min_posts
max_posts
topic_ids
visible
category
order
ascending
no_subcategories
no_definitions
status
state
search
slow_platform
filter
q
).map(&:to_sym)
# Maps `order` to a columns in `topics`
SORTABLE_MAPPING = {
'likes' => 'like_count',
'op_likes' => 'op_likes',
'views' => 'views',
'posts' => 'posts_count',
'activity' => 'bumped_at',
'posters' => 'participant_count',
'category' => 'category_id',
'created' => 'created_at'
}
def initialize(user=nil, options={})
options.assert_valid_keys(VALID_OPTIONS)
@options = options
@user = user
end
def joined_topic_user(list=nil)
(list || Topic).joins("LEFT OUTER JOIN topic_users AS tu ON (topics.id = tu.topic_id AND tu.user_id = #{@user.id.to_i})")
end
# Return a list of suggested topics for a topic
def list_suggested_for(topic)
builder = SuggestedTopicsBuilder.new(topic)
# When logged in we start with different results
if @user
builder.add_results(unread_results(topic: topic, per_page: builder.results_left), :high)
builder.add_results(new_results(topic: topic, per_page: builder.category_results_left)) unless builder.full?
end
builder.add_results(random_suggested(topic, builder.results_left, builder.excluded_topic_ids)) unless builder.full?
create_list(:suggested, {unordered: true}, builder.results)
end
# The latest view of topics
def list_latest
create_list(:latest, {}, latest_results)
end
def list_read
create_list(:read, unordered: true) do |topics|
topics.order('COALESCE(tu.last_visited_at, topics.bumped_at) DESC')
end
end
def list_new
create_list(:new, {unordered: true}, new_results)
end
def list_unread
create_list(:unread, {unordered: true}, unread_results)
end
def list_posted
create_list(:posted) {|l| l.where('tu.posted') }
end
def list_bookmarks
create_list(:bookmarks) {|l| l.where('tu.bookmarked') }
end
def list_top_for(period)
score = "#{period}_score"
create_list(:top, unordered: true) do |topics|
topics = topics.joins(:top_topic).where("top_topics.#{score} > 0")
if period == :yearly && @user.try(:trust_level) == TrustLevel[0]
topics.order(TopicQuerySQL.order_top_with_pinned_category_for(score))
else
topics.order(TopicQuerySQL.order_top_for(score))
end
end
end
def list_topics_by(user)
@options[:filtered_to_user] = user.id
create_list(:user_topics) do |topics|
topics.where(user_id: user.id)
end
end
def list_private_messages(user)
list = private_messages_for(user)
create_list(:private_messages, {}, list)
end
def list_private_messages_sent(user)
list = private_messages_for(user)
list = list.where(user_id: user.id)
create_list(:private_messages, {}, list)
end
def list_private_messages_unread(user)
list = private_messages_for(user)
list = list.where("tu.last_read_post_number IS NULL OR tu.last_read_post_number < topics.highest_post_number")
create_list(:private_messages, {}, list)
end
def list_category_topic_ids(category)
query = default_results(category: category.id)
pinned_ids = query.where('pinned_at IS NOT NULL AND category_id = ?', category.id)
.limit(nil)
.order('pinned_at DESC').pluck(:id)
non_pinned_ids = query.where('pinned_at IS NULL OR category_id <> ?', category.id).pluck(:id)
(pinned_ids + non_pinned_ids)
end
def list_new_in_category(category)
create_list(:new_in_category, unordered: true, category: category.id) do |list|
list.by_newest.first(25)
end
end
def self.new_filter(list, treat_as_new_topic_start_date)
list.where("topics.created_at >= :created_at", created_at: treat_as_new_topic_start_date)
.where("tu.last_read_post_number IS NULL")
.where("COALESCE(tu.notification_level, :tracking) >= :tracking", tracking: TopicUser.notification_levels[:tracking])
end
def self.unread_filter(list)
list.where("tu.last_read_post_number < topics.highest_post_number")
.where("COALESCE(tu.notification_level, :regular) >= :tracking", regular: TopicUser.notification_levels[:regular], tracking: TopicUser.notification_levels[:tracking])
end
def prioritize_pinned_topics(topics, options)
pinned_clause = options[:category_id] ? "topics.category_id = #{options[:category_id].to_i} AND" : "pinned_globally AND "
pinned_clause << " pinned_at IS NOT NULL "
if @user
pinned_clause << " AND (topics.pinned_at > tu.cleared_pinned_at OR tu.cleared_pinned_at IS NULL)"
end
unpinned_topics = topics.where("NOT ( #{pinned_clause} )")
pinned_topics = topics.dup.offset(nil).where(pinned_clause)
per_page = options[:per_page] || per_page_setting
limit = per_page unless options[:limit] == false
page = options[:page].to_i
if page == 0
(pinned_topics + unpinned_topics)[0...limit] if limit
else
offset = (page * per_page) - pinned_topics.count - 1
offset = 0 unless offset > 0
unpinned_topics.offset(offset).to_a
end
end
def create_list(filter, options={}, topics = nil)
topics ||= default_results(options)
topics = yield(topics) if block_given?
options = options.merge(@options)
if (options[:order] || "activity") == "activity" && !options[:unordered]
topics = prioritize_pinned_topics(topics, options)
end
topics = topics.to_a.each do |t|
t.allowed_user_ids = filter == :private_messages ? t.allowed_users.map{|u| u.id} : []
end
list = TopicList.new(filter, @user, topics.to_a, options.merge(@options))
list.per_page = per_page_setting
list
end
def latest_results(options={})
result = default_results(options)
result = remove_muted_categories(result, @user, exclude: options[:category])
result
end
def unread_results(options={})
result = TopicQuery.unread_filter(default_results(options.reverse_merge(:unordered => true)))
.order('CASE WHEN topics.user_id = tu.user_id THEN 1 ELSE 2 END')
suggested_ordering(result, options)
end
def new_results(options={})
# TODO does this make sense or should it be ordered on created_at
# it is ordering on bumped_at now
result = TopicQuery.new_filter(default_results(options.reverse_merge(:unordered => true)), @user.treat_as_new_topic_start_date)
result = remove_muted_categories(result, @user, exclude: options[:category])
suggested_ordering(result, options)
end
protected
def per_page_setting
@options[:slow_platform] ? 15 : 30
end
def private_messages_for(user)
options = @options
options.reverse_merge!(per_page: per_page_setting)
# Start with a list of all topics
result = Topic.includes(:allowed_users)
.where("topics.id IN (SELECT topic_id FROM topic_allowed_users WHERE user_id = #{user.id.to_i})")
.joins("LEFT OUTER JOIN topic_users AS tu ON (topics.id = tu.topic_id AND tu.user_id = #{user.id.to_i})")
.order("topics.bumped_at DESC")
.private_messages
result = result.limit(options[:per_page]) unless options[:limit] == false
result = result.visible if options[:visible] || @user.nil? || @user.regular?
result = result.offset(options[:page].to_i * options[:per_page]) if options[:page]
result
end
def apply_ordering(result, options)
sort_column = SORTABLE_MAPPING[options[:order]] || 'default'
sort_dir = (options[:ascending] == "true") ? "ASC" : "DESC"
# If we are sorting in the default order desc, we should consider including pinned
# topics. Otherwise, just use bumped_at.
if sort_column == 'default'
if sort_dir == 'DESC'
# If something requires a custom order, for example "unread" which sorts the least read
# to the top, do nothing
return result if options[:unordered]
end
sort_column = 'bumped_at'
end
# If we are sorting by category, actually use the name
if sort_column == 'category_id'
# TODO forces a table scan, slow
return result.references(:categories).order(TopicQuerySQL.order_by_category_sql(sort_dir))
end
if sort_column == 'op_likes'
return result.includes(:first_post).order("(SELECT like_count FROM posts p3 WHERE p3.topic_id = topics.id AND p3.post_number = 1) #{sort_dir}")
end
result.order("topics.#{sort_column} #{sort_dir}")
end
def get_category_id(category_id_or_slug)
return nil unless category_id_or_slug
category_id = category_id_or_slug.to_i
category_id = Category.where(slug: category_id_or_slug).pluck(:id).first if category_id == 0
category_id
end
# Create results based on a bunch of default options
def default_results(options={})
options.reverse_merge!(@options)
options.reverse_merge!(per_page: per_page_setting)
# Whether to return visible topics
options[:visible] = true if @user.nil? || @user.regular?
options[:visible] = false if @user && @user.id == options[:filtered_to_user]
# Start with a list of all topics
result = Topic.unscoped
if @user
result = result.joins("LEFT OUTER JOIN topic_users AS tu ON (topics.id = tu.topic_id AND tu.user_id = #{@user.id.to_i})")
.references('tu')
end
category_id = get_category_id(options[:category])
@options[:category_id] = category_id
if category_id
if options[:no_subcategories]
result = result.where('categories.id = ?', category_id)
else
result = result.where('categories.id = ? or (categories.parent_category_id = ? AND categories.topic_id <> topics.id)', category_id, category_id)
end
result = result.references(:categories)
end
result = apply_ordering(result, options)
result = result.listable_topics.includes(:category)
result = result.where('categories.name is null or categories.name <> ?', options[:exclude_category]).references(:categories) if options[:exclude_category]
# Don't include the category topics if excluded
if options[:no_definitions]
result = result.where('COALESCE(categories.topic_id, 0) <> topics.id')
end
result = result.limit(options[:per_page]) unless options[:limit] == false
result = result.visible if options[:visible]
result = result.where.not(topics: {id: options[:except_topic_ids]}).references(:topics) if options[:except_topic_ids]
result = result.offset(options[:page].to_i * options[:per_page]) if options[:page]
if options[:topic_ids]
result = result.where('topics.id in (?)', options[:topic_ids]).references(:topics)
end
if search = options[:search]
result = result.where("topics.id in (select pp.topic_id from post_search_data pd join posts pp on pp.id = pd.post_id where pd.search_data @@ #{Search.ts_query(search.to_s)})")
end
# NOTE protect against SYM attack can be removed with Ruby 2.2
#
state = options[:state]
if @user && state &&
TopicUser.notification_levels.keys.map(&:to_s).include?(state)
level = TopicUser.notification_levels[state.to_sym]
result = result.where('topics.id IN (
SELECT topic_id
FROM topic_users
WHERE user_id = ? AND
notification_level = ?)', @user.id, level)
end
require_deleted_clause = true
if status = options[:status]
case status
when 'open'
result = result.where('NOT topics.closed AND NOT topics.archived')
when 'closed'
result = result.where('topics.closed')
when 'archived'
result = result.where('topics.archived')
when 'listed'
result = result.where('topics.visible')
when 'unlisted'
result = result.where('NOT topics.visible')
when 'deleted'
guardian = Guardian.new(@user)
if guardian.is_staff?
result = result.where('topics.deleted_at IS NOT NULL')
require_deleted_clause = false
end
end
end
if (filter=options[:filter]) && @user
action =
if filter == "bookmarked"
PostActionType.types[:bookmark]
elsif filter == "liked"
PostActionType.types[:like]
end
if action
result = result.where('topics.id IN (SELECT pp.topic_id
FROM post_actions pa
JOIN posts pp ON pp.id = pa.post_id
WHERE pa.user_id = :user_id AND
pa.post_action_type_id = :action AND
pa.deleted_at IS NULL
)', user_id: @user.id,
action: action
)
end
end
result = result.where('topics.deleted_at IS NULL') if require_deleted_clause
result = result.where('topics.posts_count <= ?', options[:max_posts]) if options[:max_posts].present?
result = result.where('topics.posts_count >= ?', options[:min_posts]) if options[:min_posts].present?
Guardian.new(@user).filter_allowed_categories(result)
end
def remove_muted_categories(list, user, opts=nil)
category_id = get_category_id(opts[:exclude]) if opts
if user
list = list.where("NOT EXISTS(
SELECT 1 FROM category_users cu
WHERE cu.user_id = ? AND
cu.category_id = topics.category_id AND
cu.notification_level = ? AND
cu.category_id <> ?
)",
user.id,
CategoryUser.notification_levels[:muted],
category_id || -1
)
.references('cu')
end
list
end
def random_suggested(topic, count, excluded_topic_ids=[])
result = default_results(unordered: true, per_page: count).where(closed: false, archived: false)
excluded_topic_ids += Category.pluck(:topic_id).compact
result = result.where("topics.id NOT IN (?)", excluded_topic_ids) unless excluded_topic_ids.empty?
result = remove_muted_categories(result, @user)
# If we are in a category, prefer it for the random results
if topic.category_id
result = result.order("CASE WHEN topics.category_id = #{topic.category_id.to_i} THEN 0 ELSE 1 END")
end
# Best effort, it over selects, however if you have a high number
# of muted categories there is tiny chance we will not select enough
# in particular this can happen if current category is empty and tons
# of muted, big edge case
#
# we over select in case cache is stale
max = (count*1.3).to_i
ids = RandomTopicSelector.next(max) + RandomTopicSelector.next(max, topic.category)
result.where(id: ids.uniq)
end
def suggested_ordering(result, options)
# Prefer unread in the same category
if options[:topic] && options[:topic].category_id
result = result.order("CASE WHEN topics.category_id = #{options[:topic].category_id.to_i} THEN 0 ELSE 1 END")
end
result.order('topics.bumped_at DESC')
end
end