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