discourse/lib/topic_query.rb

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#
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# Helps us find topics. Returns a TopicList object containing the topics
# found.
#
require_dependency 'topic_list'
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require_dependency 'suggested_topics_builder'
require_dependency 'topic_query_sql'
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class TopicQuery
# Could be rewritten to %i if Ruby 1.9 is no longer supported
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VALID_OPTIONS = %w(except_topic_ids
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exclude_category
limit
page
per_page
min_posts
max_posts
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topic_ids
visible
category
order
ascending
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no_subcategories
no_definitions
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status
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state
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search
).map(&:to_sym)
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# Maps `order` to a columns in `topics`
SORTABLE_MAPPING = {
'likes' => 'like_count',
'views' => 'views',
'posts' => 'posts_count',
'activity' => 'bumped_at',
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'posters' => 'participant_count',
'category' => 'category_id',
'created' => 'created_at'
}
def initialize(user=nil, options={})
options.assert_valid_keys(VALID_OPTIONS)
@options = options
@user = user
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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
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# Return a list of suggested topics for a topic
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def list_suggested_for(topic)
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builder = SuggestedTopicsBuilder.new(topic)
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# 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), :high) unless builder.category_full?
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end
builder.add_results(random_suggested(topic, builder.results_left, builder.excluded_topic_ids), :low) unless builder.full?
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create_list(:suggested, {}, builder.results)
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end
# The latest view of topics
def list_latest
TopicList.new(:latest, @user, latest_results)
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end
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# The starred topics
def list_starred
create_list(:starred) {|topics| topics.where('tu.starred') }
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end
def list_read
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create_list(:read, unordered: true) do |topics|
topics.order('COALESCE(tu.last_visited_at, topics.bumped_at) DESC')
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end
end
def list_new
TopicList.new(:new, @user, new_results)
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end
def list_unread
TopicList.new(:new, @user, unread_results)
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end
def list_posted
create_list(:posted) {|l| l.where('tu.posted') }
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end
def list_top_for(period)
score = "#{period}_score"
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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
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end
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end
def list_topics_by(user)
create_list(:user_topics) do |topics|
topics.where(user_id: user.id)
end
end
def list_private_messages(user)
list = private_messages_for(user)
TopicList.new(:private_messages, user, list)
end
def list_private_messages_sent(user)
list = private_messages_for(user)
list = list.where(user_id: user.id)
TopicList.new(:private_messages, user, 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")
TopicList.new(:private_messages, user, list)
end
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def list_category(category)
create_list(:category, unordered: true, category: category.id) do |list|
if @user
list.order(TopicQuerySQL.order_with_pinned_sql)
else
list.order(TopicQuerySQL.order_basic_bumped)
end
end
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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
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protected
def create_list(filter, options={}, topics = nil)
topics ||= default_results(options)
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topics = yield(topics) if block_given?
TopicList.new(filter, @user, topics)
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end
def private_messages_for(user)
options = @options
options.reverse_merge!(per_page: SiteSetting.topics_per_page)
# 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(TopicQuerySQL.order_nocategory_basic_bumped)
.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 default_ordering(result, options)
# If we're logged in, we have to pay attention to our pinned settings
if @user
result = options[:category].blank? ? result.order(TopicQuerySQL.order_nocategory_with_pinned_sql) :
result.order(TopicQuerySQL.order_with_pinned_sql)
else
result = options[:category].blank? ? result.order(TopicQuerySQL.order_nocategory_basic_bumped) :
result.order(TopicQuerySQL.order_basic_bumped)
end
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'
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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]
# Otherwise apply our default ordering
return default_ordering(result, options)
end
sort_column = 'bumped_at'
end
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# If we are sorting by category, actually use the name
if sort_column == 'category_id'
return result.references(:categories).order(TopicQuerySQL.order_by_category_sql(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: SiteSetting.topics_per_page)
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# Start with a list of all topics
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result = Topic
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])
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
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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] || @user.nil? || @user.regular?
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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
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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
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# 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
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 'visible'
result = result.where('topics.visible')
when 'invisible'
result = result.where('NOT topics.visible')
end
end
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 = Guardian.new(@user)
if !guardian.is_admin?
allowed_ids = guardian.allowed_category_ids
if allowed_ids.length > 0
result = result.where('topics.category_id IS NULL or topics.category_id IN (?)', allowed_ids)
else
result = result.where('topics.category_id IS NULL')
end
result = result.references(:categories)
end
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result
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end
def latest_results(options={})
result = default_results(options)
result = remove_muted_categories(result, @user, exclude: options[:category])
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 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={})
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
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?
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result = remove_muted_categories(result, @user)
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# 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")
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end
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result.order("RANDOM()")
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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(TopicQuerySQL.order_nocategory_with_pinned_sql)
end
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end