DZone Snippets: Jchris's Code Snippets

Speeding up your acts_as_tokenized inserts

jchris (Chris Anderson) — Fri, 21 Sep 2007 21:01:22 GMT

You might want to apply this diff to your token_generator plugin. Otherwise for saving identical models the minimum time taken is one per second. Not fun!



Index: vendor/plugins/token_generator/lib/token_generator.rb

===================================================================

--- vendor/plugins/token_generator/lib/token_generator.rb       (revision 1233)

+++ vendor/plugins/token_generator/lib/token_generator.rb       (working copy)

@@ -1,7 +1,7 @@

 module TokenGenerator

   def generate_token(size = 12, &validity)

     begin

-      token = Digest::MD5.hexdigest("#{inspect}#{Time.now}").first(size)

+      token = Digest::MD5.hexdigest("#{inspect}#{Time.now}#{rand}").first(size)

     end while !validity.call(token) if block_given?

recursive Rails style serialization for javascript objects

jchris (Chris Anderson) — Wed, 16 Aug 2006 08:13:13 GMT

Have you ever wanted to post from your javascript program to a Rails app so that the params are available to your application in a properly nested hash? Prototype makes this easy for form elements with it's Form Serializer, but it makes no provision for standard javascript objects.

Suffer no longer. With the following code you can serialize arbitrarily nested objects (eg, the sort of thing you get when you parse a JSON statement), so that it is ready to be posted via http to a Rails app.

The original Rails recursive Javascript object serializer.



var serializer = {

 

  serialize : function(object) {

    var values = []; 

    var prefix = '';

    

    values = this.recursive_serialize(object, values, prefix);

    

    param_string = values.join('&');

    return param_string;

  },

  

  recursive_serialize : function(object, values, prefix) {

    for (key in object) {

      if (typeof object[key] == 'object') {

        

        if (prefix.length > 0) {

          prefix += '['+key+']';         

        } else {

          prefix += key;

        }

        

        values = this.recursive_serialize(object[key], values, prefix);

        

        prefixes = prefix.split('[');

        

        if (prefixes.length > 1) {

          prefix = prefixes.slice(0,prefixes.length-1).join('[');

        } else {

          prefix = prefixes[0];

        }

        

      } else {

        value = encodeURIComponent(object[key]);

        if (prefix.length > 0) {

          prefixed_key = prefix+'['+key+']'          

        } else {

          prefixed_key = key

        }

        prefixed_key = encodeURIComponent(prefixed_key);

        if (value) values.push(prefixed_key + '=' + value);

      }

    }

    return values;

  }

}

Usage:



payload = new Object;

payload.comment = new Object;

payload.comment.title = "The Title";

payload.comment.body = "The body of the post.";

post_string = serializer.serialize(payload);

Result:



comment%5Btitle%5D=The%20Title&comment%5Bbody%5D=The%20body%20of%20the%20post.

Which gives you this in Rails:



params[:comment] #=>

{:title => "The Title", :body => "The body of the post."}

List files that would be changed in a Capistrano deploy

jchris (Chris Anderson) — Wed, 17 May 2006 10:21:28 GMT

// description of your code here
Sometimes you want to know before hand which files have been added or changed since your last deploy. Maybe you have to run a migration. Assuming you're using subversion for you source control, this task will list the pending changes.



desc "List the files that would be updated or changed in a deploy."

task :svn_st_up, :roles => :app do

  run "cd #{current_path} && " + "svn st -u"

end

from my blog

Mongrel Spinner and Restart tasks for Capistrano

jchris (Chris Anderson) — Wed, 17 May 2006 10:18:22 GMT

These tasks should work with the default deploy.rb file. I assume you've at least read the Capistrano manual at rubyonrails.com, also, you should get your app running on mongrel first with manual booting and restarting before you try to automate.

h2. Spinner



desc <<-DESC

Spinner is run by the default cold_deploy task. Instead of using script/spinner, we're just gonna rely on Mongrel to keep itself up.

DESC

task :spinner, :roles => :app do

  application_port = xxxx #get this from your friendly sysadmin

  run "mongrel_rails start -e production -p #{application_port} -d -c #{current_path}"

end

h2. Restart



desc "Restart the web server"

task :restart, :roles => :app do

  begin

    run "cd #{current_path} && mongrel_rails restart"

  rescue RuntimeError => e

    puts e

    puts "Probably not a big deal, so I'll just keep trucking..."

  end

end

There's a more complete article on my blog.