scottlowe

def expensive_stats(id)
  puts "Executing resource intensive method for ID: #{id}"
  sleep 5
  Time.now
end

alias :expensive_stats! :expensive_stats

def expensive_stats(id)
  @expensive_stats ||= []

scottlowe

def expensive_stats(id)
  @expensive_stats ||= []

  @expensive_stats[id] ||= begin
    puts "Executing resource intensive method for ID: #{id}"
    sleep 5
    Time.now
  end
end

scottlowe

(defn fib [max]
  (loop [a 1, b 1, acc [1]]
    (if (>= (count acc) max)
      acc
      (recur b (+ a b) (conj acc b)))))

scottlowe

class Article < ActiveRecord::Base
  validates :title, :body, :presence => true

  # Note that ActiveRecord ARel from() doesn't appear to accommodate "?"
  # param placeholder, hence the need for manual parameter sanitization
  def self.tsearch_query(search_terms, limit = query_limit)
    words = sanitize(search_terms.scan(/\w+/) * "|")

    Article.from("articles, to_tsquery('pg_catalog.english', #{words}) as q").
      where("tsv @@ q").order("ts_rank_cd(tsv, q) DESC").limit(limit)

scottlowe

class CreateArticles < ActiveRecord::Migration
  def self.up
    create_table :articles do |t|
      t.string :title
      t.text :body

      t.timestamps
    end
  end

scottlowe

-- Add the new tsvector column
ALTER TABLE articles ADD COLUMN tsv tsvector;

-- Create a function that will generate a tsvector from text data found in both the
-- title and body columns, but give a higher relevancy rating 'A' to the title data  
CREATE FUNCTION articles_generate_tsvector() RETURNS trigger AS $$
  begin
    new.tsv :=
      setweight(to_tsvector('pg_catalog.english', coalesce(new.title,'')), 'A') ||
      setweight(to_tsvector('pg_catalog.english', coalesce(new.body,'')), 'B');

scottlowe

SELECT title, body, id
FROM articles, to_tsquery('pg_catalog.english', 'hot|monkeys') as q
WHERE (tsv @@ q)
ORDER BY ts_rank_cd(tsv, q) DESC
LIMIT 25

scottlowe

Autotest.add_discovery { "rails" }
Autotest.add_discovery { "rspec2" }

# Save CPU cycles!
require 'autotest/fsevent' if RUBY_PLATFORM.include?('darwin')

scottlowe

*** Bad file descriptor - Bad file descriptor (Errno::EBADF)
    --> `initialize'  944 org/jruby/RubyIO.java
        `initialize'  424 org/jruby/RubyFile.java
              `open' 1074 org/jruby/RubyIO.java
          `__file__'    1 -e
           `rbCatch' 1191 org/jruby/RubyKernel.java
          `__file__'    1 -e 
             `times'  252 org/jruby/RubyFixnum.java
            `(root)'    1 -e 

scottlowe

*** Bad file descriptor - Bad file descriptor (Errno::EBADF)
==> `initialize' 944, org.jruby.RubyIO.java
        `initialize' 424, org.jruby.RubyFile.java
        `open' 1074, org.jruby.RubyIO.java
        `__file__' 1, -e
        `rbCatch' 1191, org.jruby.RubyKernel.java 
        `__file__' 1, -e
        `times' 252, org.jruby.RubyFixnum.java
        `(root)' 1, -e