Ladislav Martincik - Personal website

Updates for Retaste.me

admin — Sat, 03 Jul 2010 10:45:14 +0000

Retaste.me was a few weeks not delivering any emails. I apologize for it. The site was constantly after 5 requests throttled by delicous. Last week I was finally able talk to delicious developer. He explained me why I got throttled that many times and what to do to prevent it. I applied all their advice and deployed new version of retaste.me app. I also added new look and feel for email and implemented delete functionality. Enjoy!

StackBuffer.com – awesome StackOverflow interface

admin — Fri, 02 Jul 2010 14:56:55 +0000

I have just released my new “exprimental” project. Its name is StackBuffer.com. StackBuffer.com is web interface for StackOverflow.com API based only on HTML5, CSS3 and JavaScript. There’s no backend. Here’s screenshot how it looks like:

StackBuffer | awesome StackOverflow interface

StackBuffer is open source project providing HTML5 and CSS3 interface for StackOverflow API. This project is actually experiment trying to prove that you can write only HTML5, CSS3 and JavaScript without need to do any backend programming. This app is targeted mostly to developers to see what can be done in short period of time with new HTML5 and CSS3. Consider it example application.

You can also find the description at stackapps.com: http://stackapps.com/questions/972/stackbuffer-awesome-stackoverflow-interface-html5-css3

I would appreciate very much any kind of feedback.

Hiring “Rock Stars” with the right life philosophy

admin — Thu, 26 Nov 2009 18:30:20 +0000

I’m working in a team of very smart and talented people, but from time to time I feel like it’s very contra-productive. All the discussion about the way the software should be written or designed. It’s exhausting and demotivating! The reason I’m writing about it is not that I need to only get it out of my head and share, but also the believe that I know why is it happening and how to change it.

All the smart and successful guys like Joel Spolsky will tell you that you should always hire the best you can. One reason is that A players will always want to hire A players. To my experience it feels little a bit wrong. I had an opportunity to work with very smart people (I mean technically and logically smart) and I love the chalenge to work with them, but there’s something that’s missing. The missing part is the philosophy of life.

In a past few years I’ve been thinking about the fact that I’ve been working with excellent people around the world and also with some other people which wasn’t actually that skilled or experienced. It turned out that I tend to work better with people with the same philosophy of life. There were people that actually wasn’t that good at their work skills but the way they connected with me helped the whole team/project to be more productive and successful.

I think Jason Fried also mentioned this fact many times, but I didn’t see it for some reason and long time it was just about hiring A’s or “Rock Stars”. Now I know that hiring ONLY smart people isn’t the way to go. Very pity it took me so long to figure this out, but I understand it now.

My advice is: “Hire the best you can but make sure they fit to your life and philosophy of life.” The same advice goes with joining new team or company.

Note: Photo from stock.xchng

Bootstraping Chef Server/Client with Sprinkle

admin — Thu, 26 Nov 2009 14:00:37 +0000

I like very much Chef tool for server configuration. I think it’s very good tool and every company doing web development should use it to bootstrap or configure their servers. But the sad truth is that before you can use Chef you need to prepare the machine with manual typing and configuration. And that’s what I don’t want to do. So I decided to change that by automating the Chef bootstrap with Sprinkle.

1) Download the code:

1	git clone git://github.com/lacomartincik/chef-bootstrap.git

2) Have ready your server or virtual machine
3) Create config file

1	cp config/config.yml.example config/config.yml

4) Set up the config with IP and user credentials

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server:
host: chef.server.local
ip: 192.168.0.1
user: deploy
password: deploy

client:
ip: 192.168.0.2
user: deploy
password: deploy

5) Run server/client bootstrap

1	./bin/chef-server

1	./bin/chef-client

Hope you find it useful. Any comments, recommendations always welcomed!

5 Mentors I admire and I follow

admin — Sun, 22 Nov 2009 15:59:41 +0000

I read a lot and I listen to audio books whenever I’m not able to read. Because I’m doing this almost 8 years I think it would be nice if I share with you what are the people that influenced me and my life. These mentors are also my day to day food helping me to overcome my challenges (I tend to use word challenge instead of problem) and motivate me whenever I need to. I highly recommend to all of you to have a look at them and if you like them try to follow them.

Brian Tracy (www.briantracy.com)

You can read a lot about Brian on his own website where he’s presenting himself with very professional language but also with a lot of sales-kind-of paragraphs which I really don’t like much. For me Brian Tracy is one of the best when it comes to motivating people and explaining whatever is happening in your life and how to change it to better. His voice and the way he presents stuff is just awesome.

Audible.com offers a lot of audio books from Brian Tracy. I like very much the “Luck Factor”. For me it was eyes opening. Also I’m listening to him most of the days I’m walking to the office to keep me motivated.

Tony Robbins (tonyrobbinstraining.com, www.tonyrobbins.com)

Tony Robbins is very popular life coach and he also calls himself “the why guy“. I’m following his blog at tonyrobbinstraining.com where he shares his thoughts mostly in video format. I really like the way he explains WHY the life is the way it is and what we can do about it. Notice how often he use smashing his hands to each other or says “I”. Full of win! One day I’m going to attend his seminar(s).

Tim Ferriss (www.fourhourworkweek.com)

Life hacker, author, enterpreneur, dancer, experimenter with life style. If you didn’t read Tim’s book “The 4-hour Work Week” go and buy it and read it. Very practical book which helped me to understand how much outsourcing can help you in your life. I’ve already outsourced many things I would before reading this book maybe never considered. Tim is also very frequent blogger and video author so don’t hesitate to follow his blog and twitter.

Kevin Rose (kevinrose.com)

He is the co-founder of Revision3, Pownce, WeFollow and the social-bookmarking website Digg. I really admire him because he’s very successful and shares his knowledge and wisdom. I really like video series called “Random” which he’s doing altogether with Tim Ferriss. I know that he’s also doing show called “Diggnation” but I’m not watching it.

Andrew Warner (mixergy.com)

I can’t miss one of the most active mentors on the web Andrew Warner founder of Mixergy.com collecting interviews of enterpreneurs and other successful people for all of us to learn from them. All the videos are great way how to learn from mistakes of others and find out how others are doing it. You should not miss any of these interviews!

Of course there are other mentors and successful people I’ve been following but these guys have been the most visible and helpful to me on my journey to understand life and it’s purpose.

Which are yours?

Replacing Ruby on Rails fixtures with Factories and Builders

admin — Sat, 04 Jul 2009 18:23:25 +0000

In my current job we were facing a well known problem called Fixtures. The term Fixtures in context of Ruby On Rails framework is the default way how the testing data are prepared/created before the tests run.

Here’s the list of important reasons why Fixtures are pain:

Hard to read (YAML format)
Hard to define edge cases
Almost impossible to modify after reaching certain size of fixtures

The only real reason for using fixtures which I can find is speed. So if you’re on small project or you really need to have tests running fast then the fixtures are good choice. But if you need to have easy to read tests with test data, possibility to easily modify them and having be able to define a lot of edge cases here’s one nice possible way to go called Design Patterns.

Factory patterns (http://en.wikipedia.org/wiki/Factory_pattern)
In these days people are already using Factory pattern as replacement for Fixtures and you can find plenty libraries to help you simplify the work:

FactoryGirl (http://thoughtbot.com/projects/factory_girl)
Foundry (http://github.com/jeremymcanally/foundry/tree/master)
Machinist (http://github.com/notahat/machinist)
ObjectDaddy (http://tasks.ogtastic.com/projects/show/object-daddy)

At the end we decided to go for FactoryGirl because it’s widely used which means there’s a lot of people to help us with answering questions and fixing bugs.

Example of FactoryGirl:

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Factory.define :invoice, :class => Invoice do |u|
u.created_at 2.days.ago
u.started_at 2.months.ago.beginning_of_month
u.ended_at 2.months.ago.end_of_month
end

Factory.define :invoice_with_billing_cycle, :parent => :invoice do |u|
u.association :billing_cycle, :factory => :billing_cycle_2_months_ago
end

Personally I also like very much Foundry by Jeremy McAnally. The only disadvantage is that it’s closely linked with Ruby On Rails named_scopes implementation.

Builder pattern (http://en.wikipedia.org/wiki/Builder_pattern)
This pattern isn’t yet widely used as Factory in Ruby On Rails community. I really don’t know why, but I didn’t find any article about using it so here we go.

I like to use this design pattern in situations when:

You need to create complex object structures (together with Factory)
You need to be flexible with creating many edge cases

The best thing about using Builder pattern is that you don’t need any library but just pure Ruby objects.

Example of Builder pattern in Ruby combined with Factory girl:

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class InvoiceBuilder

def initialize(invoice_factory, options = {})
@invoice_factory = invoice_factory
@options = options
self
end

def with_line_items(line_items)
@line_items = line_items
self
end

def create
invoice = Factory(@invoice_factory.to_sym, @options)
@line_items.each do |li|
li_factory, li_options = li
invoice.line_items << Factory(li_factory.to_sym,
li_options.merge(:invoice => invoice))
end
invoice
end

end

The code above shows very flexible way of using Builder pattern to chain your criteria as you need them. You can than write something like this:

1	InvoiceBuilder.new(:invoice_with_billing_cycle).with_line_items([ item1, item2 ]).create

Interesting articles to read:

Use builder pattern to create complex objects with relations (http://nat.truemesh.com/archives/000714.html)
Good points about testing from Jay Fields: http://blog.jayfields.com/2009/02/thoughts-on-developer-testing.html

Things to consider:

Try to keep your tests and Factories simple
Keep your data very close to your tests
Create complex structures with Builder pattern

Thanks for reading. Let me know what you think in comments. Any kind of feedback appreciated!

Using Null Object pattern with Ruby on Rails

admin — Fri, 23 Jan 2009 20:53:25 +0000

While back ago I’ve released plugin to implement Null Object Pattern. And I’ve decided to write about it. Mostly because people are not using it or don’t know it.

What it does?

Instead of using a null reference to convey absence of an object (for instance, a non-existent customer), one uses an object which implements the expected interface, but whose method body is empty. The advantage of this approach over a working default implementation is that a Null Object is very predictable and has no side effects.

Why should I use it?

You will not have to prevent your code from having null reference. For example you will not have to do this:
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print post.user.nil? ? 'Null user' : post.user.name

With Null Object pattern you write just print post.user.name and you’ll get default value for Null object defined for this attribute.
It’s very handy if you’re doing some kind of reporting that you don’t have to deal with null reference and you have object (in SQL row reference) instead.

To install the plugin

1	ruby script/plugin install git://github.com/lacomartincik/acts_as_nullobject.git

Let’s have a look how to use it
First you’ll need to define model to acts as null object:

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class User < ActiveRecord::Base
acts_as_nullobject :login => 'lacomartincik', :name => 'Ladislav Martincik'
end

Than whenever you call on User class method null_object you will get instance of NullUser class with default attributes defined in User:

1 2	>> User.null_object => NullUser...

Now if you define relationship between say Project and User like this:

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class Project < ActiveRecord::Base
belongs_to_with_nullobject :user
end

Than whenever you create new Project object with null reference to User you will get NullUser instance instead of nil:

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>> p = Project.new
>> p.user
=> NullUser

The project is available as plugin on http://github.com/lacomartincik/acts_as_nullobject.

Enjoy! Any suggestions, bug reports and comments welcomed!

Update: I had to rename plugin name from acts-as-nullobject to acts_as_nullobject otherwise it’s not going to work in Rails!

Testing your Flex app with new FunFX

admin — Wed, 14 Jan 2009 15:36:10 +0000

A few weeks ago I’ve started to dig in to new funfx gem to transform our old FunFx code and get benefit of new features that new FunFX is providing. The main reasons for moving to new code are:

Support for Firefox, so now we can run tests even on Linux boxes
Support for AdvancedDatagrid
Much better way to find components with :id and :automationName
Based on Watir so we can test also IE if needed
Visual recorder and component finder

Installation

You can install new funfx with just running on console command gem install funfx or you can download source code from GitHub. The funfx gem is dependent on Watir specific gem. Based on platform or preferences install either Watir (Win XP, Vista), SafariWatir (Mac OS X) or FireWatir (all platforms). NOTE: With FireWatir you’ll need to install Firefox Extension!

Installation Examples

- Using gems on Mac OS X

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sudo gem uninstall FunFX
sudo gem install funfx
sudo gem install safariwatir

- Using source code (you’ll need Git installed)

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sudo gem uninstall FunFX
git clone git://github.com/peternic/funfx.git
cd flex
./build.sh
cd ..
cd gem/
rake gem
rake install_gem
sudo gem install safariwatir

FunFX interface changes

Changing speed of your FunFX run
Old version was using class attribute on FunFX object like this:

1	FunFX.speed = 0.5 # half of second

New version has different class attribute name:

1	FunFX.fire_pause = 0.5

FunFX language/DSL changes
Basic components didn’t change, but arguments you’re passing changed from Hash-like style to simple arguments or vice versa.

- Finding component
For example to find component you can now use more than one identificator like :id, :automationName and so on.

Old style to find component:

1	@browser.text_area('myname')

New style:

1	@browser.text_area(:id => 'myname')

- Getting number of rows from DataGrid

Old style (as a result you will get concatenated string by comma):

1 2	@browser.data_grid('myname').tabular_data(:start => 0, :end => 2) => '1,Timothy Ferris,user'

New style (as a result you will get array of column values for each row):

1 2	@browser.data_grid('myname').values(0,2) => [['1','Timmothy Ferris','user']]

- How to find all supported methods and their arguments?
To find the right number of arguments and their meaning have a lot at elements.rb file or generate RDoc.

- Methods returning boolean
All methods returning boolean value now requires you to write question mark at the end of the method name.

Old style:

1	@browser.check_box(:id => 'myname').selected

New style:

1	@browser.check_box(:id => 'myname').selected?

- No CamelCase in method names
Old FunFX supported both styles for method calls; CamelCase and classic ruby style with underscore. New FunFX forces you to use only classic ruby style with underscore.

Old style:

1	@browser.check_box(:id => 'myname').currentState

New style:

1	@browser.check_box(:id => 'myname').current_state

Observations
Pros:

Code is much cleaner and is promising much stable way for writing FunFX tests.
Multiple browser’s and platforms support.
Easy way to find components.

Cons:

Recorder is not always useful in copy/paste scenario
Visual component finder is not able to find itemRenderers inside DataGrid (you have to go through tree manually)
Not much of documentation

Links and resources:
Old FunFX site: http://funfx.rubyforge.org/
Author and main contributor to FunFX: http://peternic.blogspot.com/
New FunFX GitHub repository: http://github.com/peternic/funfx/tree/master
RubyForget site: http://funfx.rubyforge.org/
Bug/Issue tracking: http://bekkopen.lighthouseapp.com/projects/20367-funfx/
Google Group: http://groups.google.com/group/funfx?pli=1

Becaming freelancer

admin — Sun, 14 Dec 2008 17:17:40 +0000

As of 31 of January, 2009 I’ll became available as freelancer for 3 days work per week. I’m interested in doing Ruby and Servers related projects. You can find my online CV at Linkedin.com. My Open source code can be found at Github.com. If you’re interested, please leave your details in comment and I’ll contact you back. Thank you