discourse/lib/search.rb

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require_dependency 'search/search_result'
require_dependency 'search/search_result_type'
require_dependency 'search/grouped_search_results'
class Search
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def self.per_facet
5
end
# Sometimes we want more topics than are returned due to exclusion of dupes. This is the
# factor of extra results we'll ask for.
def self.burst_factor
3
end
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def self.facets
%w(topic category user)
end
def self.long_locale
case I18n.locale # Currently-present in /conf/locales/* only, sorry :-( Add as needed
when :da then 'danish'
when :de then 'german'
when :en then 'english'
when :es then 'spanish'
when :fr then 'french'
when :it then 'italian'
when :nl then 'dutch'
when :pt then 'portuguese'
when :sv then 'swedish'
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when :ru then 'russian'
else 'simple' # use the 'simple' stemmer for other languages
end
end
def initialize(term, opts=nil)
if term.present?
@term = term.to_s
@original_term = PG::Connection.escape_string(@term)
end
@opts = opts || {}
@guardian = @opts[:guardian] || Guardian.new
@search_context = @opts[:search_context]
@limit = Search.per_facet * Search.facets.size
@results = GroupedSearchResults.new(@opts[:type_filter])
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end
# Query a term
def execute
return nil if @term.blank? || @term.length < (@opts[:min_search_term_length] || SiteSetting.min_search_term_length)
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# If the term is a number or url to a topic, just include that topic
if @results.type_filter == 'topic'
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begin
route = Rails.application.routes.recognize_path(@term)
return single_topic(route[:topic_id]).as_json if route[:topic_id].present?
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rescue ActionController::RoutingError
end
return single_topic(@term.to_i).as_json if @term =~ /^\d+$/
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end
find_grouped_results.as_json
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end
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private
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def find_grouped_results
if @results.type_filter.present?
raise Discourse::InvalidAccess.new("invalid type filter") unless Search.facets.include?(@results.type_filter)
send("#{@results.type_filter}_search")
else
@limit = Search.per_facet + 1
user_search
category_search
topic_search
end
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add_more_topics_if_expected
@results
end
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# Add more topics if we expected them
def add_more_topics_if_expected
expected_topics = 0
expected_topics = Search.facets.size unless @results.type_filter.present?
expected_topics = Search.per_facet * Search.facets.size if @results.type_filter == 'topic'
expected_topics -= @results.topic_count
if expected_topics > 0
extra_posts = posts_query(expected_topics * Search.burst_factor)
extra_posts = extra_posts.where("posts.topic_id NOT in (?)", @results.topic_ids) if @results.topic_ids.present?
extra_posts.each do |p|
@results.add_result(SearchResult.from_post(p))
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end
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end
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end
# If we're searching for a single topic
def single_topic(id)
topic = Topic.where(id: id).first
return nil unless @guardian.can_see?(topic)
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@results.add_result(SearchResult.from_topic(topic))
@results
end
def secure_category_ids
return @secure_category_ids unless @secure_category_ids.nil?
@secure_category_ids = @guardian.secure_category_ids
end
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def category_search
categories = Category.includes(:category_search_data)
.where("category_search_data.search_data @@ #{ts_query}")
.order("topics_month DESC")
.secured(@guardian)
.limit(@limit)
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categories.each do |c|
@results.add_result(SearchResult.from_category(c))
end
end
def user_search
users = User.includes(:user_search_data)
.where("user_search_data.search_data @@ #{ts_query}")
.order("CASE WHEN username_lower = '#{@original_term.downcase}' THEN 0 ELSE 1 END")
.order("last_posted_at DESC")
.limit(@limit)
users.each do |u|
@results.add_result(SearchResult.from_user(u))
end
end
def posts_query(limit)
posts = Post.includes(:post_search_data, {:topic => :category})
.where("post_search_data.search_data @@ #{ts_query}")
.where("topics.deleted_at" => nil)
.where("topics.visible")
.where("topics.archetype <> ?", Archetype.private_message)
# If we have a search context, prioritize those posts first
if @search_context.present?
if @search_context.is_a?(User)
# If the context is a user, prioritize that user's posts
posts = posts.order("CASE WHEN posts.user_id = #{@search_context.id} THEN 0 ELSE 1 END")
elsif @search_context.is_a?(Category)
# If the context is a category, restrict posts to that category
posts = posts.order("CASE WHEN topics.category_id = #{@search_context.id} THEN 0 ELSE 1 END")
end
end
posts = posts.order("TS_RANK_CD(TO_TSVECTOR(#{query_locale}, topics.title), #{ts_query}) DESC")
.order("TS_RANK_CD(post_search_data.search_data, #{ts_query}) DESC")
.order("topics.bumped_at DESC")
if secure_category_ids.present?
posts = posts.where("(categories.id IS NULL) OR (NOT categories.read_restricted) OR (categories.id IN (?))", secure_category_ids)
else
posts = posts.where("(categories.id IS NULL) OR (NOT categories.read_restricted)")
end
posts.limit(limit)
end
def query_locale
@query_locale ||= Post.sanitize(Search.long_locale)
end
def ts_query
@ts_query ||= begin
escaped_term = PG::Connection.escape_string(@term.gsub(/[:()&!]/,''))
query = Post.sanitize(escaped_term.split.map {|t| "#{t}:*"}.join(" & "))
"TO_TSQUERY(#{query_locale}, #{query})"
end
end
def topic_search
# If we have a user filter, search all posts by default with a higher limit
posts = if @search_context.present? and @search_context.is_a?(User)
posts_query(@limit * Search.burst_factor)
else
posts_query(@limit).where(post_number: 1)
end
posts.each do |p|
@results.add_result(SearchResult.from_post(p))
end
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end
end