Bambinos

Solving the problem of non-working key forwarding with Capistrano

Sun, 01 Nov 2009 16:42:00 +0000

After I upgraded my Mac to Snow Leopard, Capistrano deployments with key forwarding stopped working. I started getting a following error:

Permission denied (publickey).

My fellow Bambinos enlightened me that key forwarding was switched off by default in Snow Leopard. The solution was to change the following two lines in /etc/ssh_config:

#Host *
#ForwardAgent no

to the following two lines:

Host *
ForwardAgent yes

Unfortunately after this change I was still getting Permission denied (publickey) error.

Today I found the root cause. My ssh key was not added to the authentication agent so the key was not forwarded. The solution was to execute the following command:

ssh-add ~/.ssh/id_dsa

(or ssh-add ~/.ssh/id_rsa if you use rsa key)

Now everything works fine.

migration to generate paperclip attachment on your model

Mon, 06 Jul 2009 10:22:34 +0100

./script/generate paperclip MODEL_NAME ATTACHMENT_NAME

example:

./script/generate paperclip video source

GENERATES:

add_attachments_source_to_video.rb

class AddAttachmentsSourceToVideo < ActiveRecord::Migration
def self.up
add_column :video, :source_file_name, :string
add_column :video, :source_content_type, :string
add_column :video, :source_file_size, :integer
end

def self.down
remove_column :video, :source_file_name
remove_column :video, :source_content_type
remove_column :video, :source_file_size
end
end

1337 github mod for new iphone

Fri, 19 Jun 2009 17:03:34 +0100

1337 github mod for new iphone

Is beanstalkd really distributed?

Sun, 07 Jun 2009 14:20:49 +0100

I recently needed to understand how beanstalkd works and how does it implement the distributed behaviour, so I did some reading.

From the beanstalkd main page:

beanstalkd is a fast, distributed, in-memory workqueue service

Ok, it is a distributed service, so let’s find some more info about its distributed nature.

This is what we can find in beanstalkd FAQ:

Does beanstalk inherently support distributed servers?
Yes, although this is handled by the clients, just as with memcached. The beanstalkd server doesn’t know anything about other beanstalkd instances that are running.

Using the same argumentation I could say that FTP or any database server is also distributed if you only start more than one instance. The fact some server allows to create scalable and distributed solutions, doesn’t necessarily mean that they are distributed on their own.

Run Apple's QuickTime Player from the terminal

Sat, 16 May 2009 17:44:27 +0100

open -a “QuickTime Player” VIDEO_FILE

Grep in Project command for TextMate

Fri, 15 May 2009 10:42:53 +0100

Grep in Project command for TextMate

Escaping Params Containing Periods in Ruby on Rails

Fri, 03 Apr 2009 15:41:14 +0100

Escaping Params Containing Periods in Ruby on Rails:

:requirements => { :id => /.*/ }

How to run the Haml plugin generator in Rails Templates

Thu, 26 Mar 2009 15:03:29 +0000

Here is how to run Haml’s unorthodox plugin generator method using Rails Templates:

Here is a sample Rails Template for fun:

The best UNIX commands on the web

Thu, 26 Mar 2009 13:49:50 +0000

The best UNIX commands on the web

Freudian slip during copywriting

Wed, 11 Mar 2009 11:31:05 +0000

The alternative, and traditional method of ruinning software projects is called “waterfall”

Open Terminal Here in Finder

Wed, 25 Feb 2009 22:57:11 +0000

Open Terminal Here in Finder

Include custom actions from a module in a Merb controller

Fri, 23 Jan 2009 15:25:05 +0000

module Foo
  def self.included(base)
    base.show_action(:custom_action)
  end
  
  def custom_action
    "foo"
  end
end

Git SHA1 of HEAD in your Rails/Merb App

Mon, 19 Jan 2009 12:20:18 +0000

Git SHA1 of HEAD in your Rails/Merb App

Delete all removed files from git

Fri, 16 Jan 2009 11:46:41 +0000

git add -u
This deletes all removed files from git.

Skinny controllers with resources_controller and named_scope

Mon, 08 Dec 2008 13:52:00 +0000

resources_controller takes you a long way into simplifying your controllers. Still, whenever you need to add custom collection or member routes to your app you’re out in the wild again. This snippet of code uses a combination of ActiveRecord’s named_scopes and resources_controller to simplify those custom actions. With a bit more of abtraction it could be turned into library code that you test once and reuse as many times as you want in different codebases.

The cool thing is that we get seamless nested controllers if we need them, such as in /posts or /users/2/posts

Convention for ActiveRecord extensions

Tue, 25 Nov 2008 11:20:52 +0000

There’s not one but many ways of extending ActiveRecord. Some people do:

ActiveRecord::Base.send :include SomeModule

Which in turns includes or extends other modules.

Others extend first, and include internally. Others class_eval the hell out of everything.

There are a few gotchas to avoid, such as accidentally reloading the same modules (ie. in background tasks), which can cause havoc if your extensions uses method aliasing.

Looking at different approaches, I’ve come up with this draft of a convention.

Here’s the gist of it.

Get the current working directory of a process

Wed, 19 Nov 2008 13:43:31 +0000

pwdx PID

Build a bug tracker in 5 mins

Tue, 18 Nov 2008 16:38:00 +0000

Go to google docs, click new spread sheet
Click form, create your form with title, description, severity (1 minor .. 5 epic fail), who’s responsible in a dropdown and reported by.
Save your form
Add conditional colouring on severity
Add a completed/status column
Embed form onto a page/email form to bug hunters.

XP song

Sat, 15 Nov 2008 19:33:51 +0000

XP song

Adding comments to Tumblr

Wed, 12 Nov 2008 23:46:42 +0000

Adding comments to Tumblr