Reflective Pixel

Rails only accepts certain http verbs. It is simple enough to...

Tue, 22 Feb 2011 05:45:00 -0500

Rails only accepts certain http verbs. It is simple enough to tell apache to limit access to passenger

It can also live at the directory or server config level


  ServerName plm.local
  DocumentRoot "/Users/kbrock/projects/plm-website/public"
  RailsEnv development
  
    
      Order deny,allow
      Deny from all

I want to speed up my local database. So I compromise data...

Tue, 15 Feb 2011 15:55:17 -0500

I want to speed up my local database. So I compromise data integrity by not forcing the syncs. Loose a little bit of the ACID, but get some speed

On homebres, I have this file installed in /usr/local/var/db/postgres/postgres.conf

fsync = off				# turns forced synchronization on or off
synchronous_commit = off		# immediate fsync at commit

I’d love to use a game controller like the IshockX to...

Wed, 15 Dec 2010 13:45:36 -0500

I’d love to use a game controller like the IshockX to write software.

Wonder why the programming languages are so verbose, filled with nuances, and require so much typing

trying out redcar # install redcar rvm use ree rvm gemset...

Thu, 09 Dec 2010 22:34:45 -0500

trying out redcar


# install redcar
rvm use ree
rvm gemset create redcar
rvm use @gemset
gem install redcar
redcar install

# create wrapper
rvm wrapper ree@redcar wrapped redcar

# alias wrapper to redcar
echo -e '\nalias redcar=wrapped_redcar' >> ~/.bashrc
. ~/.bashrc

via redcar lighthouse
image

If you do printf debugging, this adds pretty colors and only...

Mon, 19 Jul 2010 09:03:50 -0400

If you do printf debugging, this adds pretty colors and only shows for the user requesting the logging

# if you want to customize, redefine in initializers
# passenger does not define ENV['USER']
USER=ENV['HOME'].split('/').last

#usage:  my_log 'kbrock', 'UserController#logout', name
#only for me, will log 
def my_log(*args)
  who=args.shift #determine who wants to see this
  if who.nil? || who == USER
    theme=args.shift
    params = args.join ' ' || ''
    params += ' ' + yield if block_given?
    message="\e[1;34m#{theme}\e[0m #{params}"
    Rails.logger.debug(message)
    puts(message) unless Rails.env.test?
  end
end

Private Browsing or cleared your cookies? heh - go to flash...

Tue, 29 Jun 2010 15:21:25 -0400

Private Browsing or cleared your cookies?

heh - go to flash player preferences to see the stuff that you missed.

Tests rebuild database which takes a bit of time. I hacked...

Mon, 28 Jun 2010 15:34:31 -0400

Tests rebuild database which takes a bit of time. I hacked Rakefile to not rebuild database every time.


Rake::Task['features'].clear_prerequisites   rescue nil # For some super weird reason this fails for some...
Rake::Task['default'].clear_prerequisites    rescue nil
Rake::Task['spec'].clear_prerequisites rescue nil

task :spec          => %w[db:abort_if_pending_migrations]
task :features      => %w[db:abort_if_pending_migrations]

desc "Run all tests and features"
task :default => %w(spec features)

Rake task to generate model diagrams in a rails...

Fri, 25 Jun 2010 12:40:06 -0400

Rake task to generate model diagrams in a rails project


namespace :doc do
  desc "document db: (annotate, schema.rb, dot)"
  task :db=>%w(annotate_models db:schema:dump doc:dot)

  desc "Use railroad to generate graphviz dot files"
  task :dot do
    #tack on stuff at the top of the page
    FORMAT=%q{sed 's/graph\\[/  graph[page="8.5,11",\
            size="7.5,10",center=1];\
    node[shape=Mrecord,width="1.2",fillcolor="#cccccc",\
            style="filled", penwidth="2"]\
    edge [ minlen="1.2", penwidth="2"]\
    graph[/'}
  
    now=`rake db:version`.chomp.split(' ')[-1]
    models="doc/models#{now}.dot"
    #hide magic hides created_at, updated_at
   puts `railroad -liM --hide-magic|#{FORMAT}>#{models}`
  
    [models].each do |filename|
      filetype='pdf'
      outfile=filename.gsub('.dot',".#{filetype}")
      #create viewable file (graphviz must be installed)
      puts `dot -T#{filetype} #{filename} -o#{outfile}`

      #open the file using mac graphviz app
      puts `open #{filename} -a graphviz`
    end
  end
end

Easiest way I’ve fount to work with svn is to just use git...

Thu, 29 Apr 2010 20:35:00 -0400

Easiest way I’ve fount to work with svn is to just use git as the client.

Most people explain how to converting svn to git. This lets me use git as a client for an svn server.

SVN_ROOT=ssh+svn://repo/opt/svn/repo/project1
git svn init -s $SVN_ROOT
git svn fetch
#git checkout -b svnrebase trunk
git rebase --onto trunk --root master
git svn dcommit

Collect for a hash

Fri, 23 Apr 2010 13:11:42 -0400

module Enumerable
  def hash_map
    hash = {}
    self.each {|o| hash.store(*yield(o))}
    hash
  end
end

my_hash = lines.hash_map {|l| l.split /:/}

Great suggestion on redit for creating a hash from other objects.

test helper

Tue, 30 Mar 2010 13:04:00 -0400

I added assert_empty to check that an array is empty.

But the line number from test helper.rb was the first line of the test helper, not the line in the test.

Instead, I wanted to see the actual failure as the first line. Welcome remove_me_from_trace(exception)

class Test::Unit::TestCase
  def assert_empty(*args)
    begin
      args.unshift []
      assert_equal *args
    rescue => e
      raise remove_me_from_trace(e)
    end
  end

  def remove_me_from_trace(e)
    x=e.backtrace.shift until (x =~ /test_helper.rb/ )
    e
  end
end

even better rake db:migrate

Wed, 24 Mar 2010 12:11:00 -0400

I normally don’t like hacking rails files directly, but this is the only way I could extend rake db:migrate to support a friendly VERSION.

railities/lib/tasks/database.rake on line 111.

  # was ENV["VERSION"] ? ENV["VERSION"].to_i : nil
  # looks up version based upon migration files
  def version_num
    version=ENV["VERSION"]
    if version.to_i==0 && version.present?
      matches=Dir["db/migrate/*#{ENV["VERSION"]}*"]
      if matches.length > 0
        #prune off directory name
        matches=matches.collect{|n| n.gsub(/^.*\//,'')}

        unless matches.length == 1
          raise "VERSION #{version} matches "+
            "#{matches.join(', ')}"
        end

        #prune off version num
        version=matches.first.gsub(/([^_]*)_.*$/) {$1}
        puts "VERSION=#{version}"
      end
    end
    version ? version.to_i : nil
  end

In 3 places (migrate, up, down), the version code is changed from

ENV["VERSION"] ? ENV["VERSION"].to_i : nil

version_num

Now rake db:migrate:down VERSION=create_photo works like a charm.

better rake db:migrate

Tue, 23 Mar 2010 16:27:00 -0400

I have been using a schell script so I don’t need to remember the long version number associated with ruby migrations.

#given a migration task, return the version
#e.g.: rake db:migrate:redo VERSION=$(mver create_photo)
function mver() {
  scr=${1:?Please specify migration action}
  ls db/migrate/*${scr}* | sed 's=^[^0-9]*\([0-9][^_]*\)_.*$=\1='
}

which will run migration 20100302214328_create_photos_and_folders.rb

Had an error about removing Object::ClassMethods. I added the...

Wed, 24 Feb 2010 12:09:00 -0500

Had an error about removing Object::ClassMethods.

I added the following to environment.rb to help me home in on the conflict.

RAILS_DEFAULT_LOGGER = Logger.new(STDOUT)
ActiveSupport::Dependencies::log_activity = true

New Hope: I’ve failed a few times ripping my DVDs to the...

Fri, 19 Feb 2010 21:10:00 -0500

New Hope: I’ve failed a few times ripping my DVDs to the network so I can watch on my TV/WDTV Live. But this time it looks promising

Ripping is easy, but my mkv files have been horrible. Am backing up to an iso so I can re compress these videos once I figure out my best options.

#mov_dir is the directory that contains the the VIDEO_TS directory.
hdiutil makehybrid -o "${mov_dir}.iso" "${mov_dir}"

thanks

Question: Is it possible to calculate the Pythagorean Formula...

Sat, 10 Oct 2009 02:00:00 -0400

Question: Is it possible to calculate the Pythagorean Formula without the use of a square root function? source

In order to support Geokit in sqlite3, I need a way to calculate distances that does not require cosine or square root. In my problem space, the points are relatively close to each other.

C1=A+B

The error was very similar to the size of the lowest number. So subtracted a fraction of the lowest number.

C2=A+B-min(A,B)*0.6

Restated the formula with min and max, and tweaked the ratios.

C3=max(A,B)*0.945 + min(A,B)*0.415

calculation references
A	B	C	c1	error	c2	error	c3	error
1000	1000	1414	2000	586	1400	-14	1360	54
1000	750	1250	1750	500	1300	50	1256	-6
1000	500	1118	1500	382	1200	82	1153	-34
1000	250	1031	1250	219	1100	69	1049	-18
1000	0	1000	1000	0	1000	0	945	55

Please share if you can help me come up with a better approximation or if you see an error.

thanks Meridian.

require 'hotcocoa' class Application include HotCocoa ...

Fri, 10 Jul 2009 12:00:00 -0400

require 'hotcocoa'
class Application
  include HotCocoa
  FULL={:expand => [:width,:height]}
  SHOW=[0,0,0,100]
  def start
    application :name => "MyTableView" do |app|
      app.delegate = self
      window(:title => "MyTableView",
        :frame => [10, 620, 330, 230]) do |win|
        win << split_view(:horizontal => true,
          :layout => FULL,:frame=>SHOW) do |sp|
          sp << sc=scroll_view(:frame => SHOW)
          sc << @tv=table_view(:data=>[],:columns=>[])
          sp << @pr=text_field(:text => 'type here',
            :font => font(:name=>'Monaco', :size => 16),
            :on_action => Proc.new {|t| type(t.to_s)})
        end #sp
        win.contentView.margin = 5
        win.makeFirstResponder @pr
        win.will_close { exit }
      end #window (win)
    end #application
  end
  def type(t)
    values={}
    t.split.each_with_index do |v,i|
      values["c#{i}"]=v
      if i >= @tv.tableColumns.size
        @tv.tableColumns << column(:id=>"c#{i}",
          :title=>"Word #{i+1}")
      end
    end
    @tv.dataSource.data << values
    @tv.reloadData
  end
end
Application.new.start

#thanks again to everburning.com

require 'hotcocoa' include HotCocoa require...

Thu, 09 Jul 2009 00:22:00 -0400

require 'hotcocoa'
include HotCocoa
require "lib/bezel.rb";
framework 'ScriptingBridge'

class Application
  def start
    application :name => "Ask Google" do |app|
      app.delegate = self
      @main_window = bezel_window(
        :frame => [450,300,128,128],
        :buttons => [
          ["Google it",lambda { |s| doit }],
          ["Quit",lambda { |s| exit }]])
    end
  end
  def open_url(url)
    @safari.documents.first.URL=url
    sleep(1) #wait for safari to load url
    @safari.windows.first.currentTab
  end
  def fill_form(tab,form,values={})
    values.each_pair do |n,v|
      safari_do tab,"document.#{form}.#{n}.value='#{v}'"
    end
    safari_do tab,"document.#{form}.submit()"
  end
  def safari_do(tab,cmd)
    @safari.doJavaScript(cmd, :'in'=>tab)
  end
  def doit
    @safari = SBApplication.
      applicationWithBundleIdentifier('com.apple.Safari')
    @safari.activate #bring to front
    tab=open_url('http://www.google.com/')
    fill_form tab,:f, :q=>"macruby"
  end
end
Application.new.start

thanks python people and @lrz

require 'hotcocoa' class Application include HotCocoa ...

Thu, 25 Jun 2009 10:40:45 -0400

require 'hotcocoa'
class Application
  include HotCocoa
  FULL={:expand => [:width,:height]}
  SHOW=[0,0,0,100]
  def start
    application :name => "MyTableView" do |app|
      app.delegate = self
      window(:title => "MyTableView",
        :frame => [10, 620, 330, 230]) do |win|
        win << split_view(:horizontal => true,
          :layout => FULL) do |sp|
          sp << scroll_view(:frame => SHOW) do |sv|
            sv << @table=table_view(
              :data => [], :columns => [
                column(:id => :c1, :title => "Word 1"),
                column(:id => :c2, :title => "Word 2"),
                column(:id => :c3, :title => "...")])
          end #sv
          sp << @prompt = text_field(:text => 'type here',
            :font => font(:name=>'Monaco', :size => 16),
            :on_action => Proc.new {|t| type(t)})
        end #sp
        win.contentView.margin = 5
        win.makeFirstResponder @prompt
        win.will_close { exit }
      end #window (win)
    end #application
  end
  def type(t)
    c1,c2,*c3=t.to_s.split ; c3=c3.join ' '
    @table.dataSource.data << {:c1=>c1,:c2=>c2,:c3=>c3}
    @table.reloadData
  end
end
a=Application.new.start

thanks everburning

redirect app

Thu, 18 Jun 2009 09:39:00 -0400

I currently work on port 80, but coworkers work on port 3000. So the urls they send often do not work. I created an app that bounces all local 3000 requests to port 80.

mkdir -p bounce/public bounce/tmp
cd bounce

created config.ru:

app = proc do |env|
    url="http://#{env['SERVER_NAME']}#{env['REQUEST_URI']}"
    return [302, { "Content-Type" => "text/html", "Location" => url }, "try #{url}" ]
end
run app

enabled port 3000 in /private/etc/apache2/httpd.conf:

Listen 3000

added entry to passenger pref pane. But it didn’t create the proper vhosts entry. I changed port 80 to 3000

3000>
  ServerName site1.local:3000
  ServerAlias test.local:3000
  DocumentRoot "/Users/kbrock/projects/bounce/public"
  RackEnv development
  
    Order allow,deny
    Allow from all

All is working.