discourse/app/models/search_observer.rb

104 lines
2.6 KiB
Ruby

class SearchObserver < ActiveRecord::Observer
observe :topic, :post, :user, :category
def self.scrub_html_for_search(html)
HtmlScrubber.scrub(html)
end
def self.update_index(table, id, idx)
Post.exec_sql("delete from #{table} where id = ?", id)
sql = "insert into #{table} (id, search_data) values (?, to_tsvector('english', ?))"
begin
Post.exec_sql(sql, id, idx)
rescue
# don't allow concurrency to mess up saving a post
end
end
def self.update_posts_index(post_id, cooked, title, category)
idx = scrub_html_for_search(cooked)
idx << " " << title
idx << " " << category if category
update_index('posts_search', post_id, idx)
end
def self.update_users_index(user_id, username, name)
idx = username.dup
idx << " " << (name || "")
update_index('users_search', user_id, idx)
end
def self.update_categories_index(category_id, name)
update_index('categories_search', category_id, name)
end
def after_save(obj)
if obj.class == Post && obj.cooked_changed?
category_name = obj.topic.category.name if obj.topic.category
SearchObserver.update_posts_index(obj.id, obj.cooked, obj.topic.title, category_name)
end
if obj.class == User && (obj.username_changed? || obj.name_changed?)
SearchObserver.update_users_index(obj.id, obj.username, obj.name)
end
if obj.class == Topic && obj.title_changed?
if obj.posts
post = obj.posts.where(post_number: 1).first
if post
category_name = obj.category.name if obj.category
SearchObserver.update_posts_index(post.id, post.cooked, obj.title, category_name)
end
end
end
if obj.class == Category && obj.name_changed?
SearchObserver.update_categories_index(obj.id, obj.name)
end
end
class HtmlScrubber < Nokogiri::XML::SAX::Document
attr_reader :scrubbed
def initialize
@scrubbed = ""
end
def self.scrub(html)
me = self.new
parser = Nokogiri::HTML::SAX::Parser.new(me)
begin
copy = "<div>"
copy << html unless html.nil?
copy << "</div>"
parser.parse(html) unless html.nil?
end
me.scrubbed
end
def start_element(name, attributes=[])
attributes = Hash[*attributes.flatten]
if attributes["alt"]
scrubbed << " "
scrubbed << attributes["alt"]
scrubbed << " "
end
if attributes["title"]
scrubbed << " "
scrubbed << attributes["title"]
scrubbed << " "
end
end
def characters(string)
scrubbed << " "
scrubbed << string
scrubbed << " "
end
end
end