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Programming

General topics of interest to software development.

A Reflection of the Technologies I Built Things With

Sometimes, a random event triggers a walk back down memory lane. That moment came for me the other day when I came across a CDR containing the code I ever wrote the first 15 years of my programming career. For just over 30 years, I've been building software professionally and I have kept backups of nearly everything I've ever written. What somewhat surprised me as I looked through all this old code is the breadth of machines, operating systems, and languages I touched along the way. As I thought on this list, I wondered what all I made use of during my career and wondered what that list might look like, so I set out to compile just such a list. If I used the language, operating system, or platform and built a complete application that was deployed and used… read more


Dynamic Routing in Rails Revisited

Ever since my original post [Creating Dynamic Routes at runtime in Rails 4](/ramblings/creating-dynamic-routes-at-runtime-in-rails-4), I have been digging into Rails routing more and more. I've gotten a lot of feedback on the post itself as well as comments in the IRC #rubyonrails channel with an over abundance of passionate pleas not to do routing this way in Rails. But it seems a lot of people desire do to it this way and I have even been inspired to put a gem together to do it. A few days ago, I introduced a refactored version at 0.1.1 and then two days later, a radically refactored version at 0.2.2. Let's talk about this gem and why it's upsetting some Rails purists. This is a long post and describes a bit of my journey from a good solution to a slightly… read more


Creating Dynamic Routes at runtime in Rails 4

I was working on a fairly simple site that has a content management component to it and wanted to find a way to dynamically generate the routes to the pages that were managed on the back-end by the site authors. This article presents an alternative to the usual approach of creating a catch-all route in the routes.rb by generating specific routes to each and every page. ## Preamble Sometimes, its faster to re-invent the wheel than to figure out thousands of lines of other people's code. Rails is great in that way -- you can look at the ecosystem and find lots of great pre-existing solutions or you can roll your own in very short order when the requirements are clear and precise. Such is the situation I found myself in while trying to get one of the… read more


Adding Google Analytics script to Sprockets

Today, I wanted to add Google Analytics for tracking my website's usage history. Rails 4.0 has an excellent assets pipeline that generally works well out of the box with little fuss, but when you try to do something outside adding another require to the "assets/javascripts/application.js.coffee" file, it gets a little more complicated to implement. Here, I show you exactly how to add Google Analytics as a coffeescripted script that is only loaded in the production environment. ## Preamble One of the things I _don't_ do is use sprockets' "require_tree ." directive because this tends to pick up everything I have in the assets folders for every rendering and that's just not necessary. Even though uglifier and sprockets does a good job of compressing and minifying the javascript code, I rarely need more than a handful of those assets on the… read more


Gems you should consider for every Rails projects

Ruby on Rails provides a lot of great functionality out of box, but there are a few gems I almost always add to my new Rails projects. Here are some of those gems I practically cannot live without. ## HAML Templates ~~~ text gem 'haml' ~~~ I know many developers who say "HTML is a perfectly good DSL for HTML" and I used to follow in this mantra myself until one day I had to work on a new Rails project that already had HAML in use. There's a lot to be said for "less is more" when the clutter of punctuation and inconsistently indented code is replaced by the stripped down, well-indented code. When you inherit a ERB-based project that is full of conditional flow and Ruby code embedded in the view files, you really start to appreciate the… read more


Implementing Ruby jobs in the background

I needed a way to kick off a background job that was triggered by an end-user on my Ramaze-backed website and could run for almost two hours! This article brings together all the elements to get the job done. ## Preamble (a.k.a. Ramblings) I can hear you exclaiming, "Two hours!? Are you nuts? You really don't want to do that on a web application," and you would be correct; I did not. But alas, my users wanted it and they waved money in front of my face to get it done. What's a poor sap like me to do but to comply? So, what is this crazy task that needs to run so urgently it couldn't wait until a midnight cronjob task to kick it off? Well, the task is basically exporting data from the live production database to a… read more


One ActiveRecord Model Acting as a List and Tree

Occasionally, Rails can appear to make your life extremely easy while silently throwing you a curve-ball. I needed a model that required a hierarchy while also preserving order of the records. Although fairly straightforward to set up and start immediately using, there are a couple of "gotchas" to watch out for and this article covers those pitfalls and shows how to apply the cool new "dirty attributes" feature in ActiveRecord. ## The Problem I am working on a content management system (CMS) where I want the pages to have a hierarchical structure that turns into a menu with sub-menus. The content manager needs to also be able to order these pages so that the menu structure renders in the desired order. ## The Solution Two plugins jumped to mind almost immediately: **acts_as_tree** and **acts_as_list**. The tree plugin will manage the… read more


Ultraviolet gives new life to Syntax highlighting

I am tired of Google's Syntax highlighter.  If I accidentally switch to Visual mode in the editor and do some edits and switch back to HTML mode, then I lose the class="code" moniker and I have to go through the entire post and fix. Another drawback I have with Google Syntax highlighter is that the page renders without highlighting and then all the code listings change to syntax highlighted text a few moments later. Introducing [Ultraviolet][1], a syntax highlighter supporting over 50 syntaxes and any [TextMate][2] theme.  Ultraviolet is based on [Oniguruma][3], a regular expression library that comes standard with Ruby 1.9. Ultraviolet requires a little more effort for me to cut and paste, but I am definitely much happier with the end results and Wordpress no longer mungs my posts. Only real complaint I have is that I can't… read more


Ramaze and ActiveRecord

Thanks to the great folks on IRC over at Freenode#ramaze, I was able to not only get Ramaze working with Erubis and Activerecord for a pseudo apples to apples comparison of Rails vs. Ramaze performance benching, but I was also able to get Apache 2.2.9 talking to Passenger to Ramaze. This quick post will take you through the basics. ## Environment This post will guide you through setting up the following environment on Ubuntu Intrepid (8.10): * [Apache 2.2.9][1] * [Passenger 2.0.6][2] * [ActiveRecord 2.2.2][3] * [Ramaze 2009.01][4] * [Erubis 2.6.2][5] * [MySql 5.0.67 (assumed installed)][6] To get started: ~~~ bash sudo apt-get install apache2 passenger sudo passenger-install-apache2-module ~~~ Install the Rack, Ramaze, Activerecord, and Erubis gems ~~~ bash sudo gem install rack, ramaze, activerecord, erubis ~~~ ## Establishing Project Now create your first ramaze project with: ~~~ bash ramaze… read more


Initial release of Elemental

I am happy to announce the initial release of Elemental 0.1.1. Elemental provides enumerated collection of elements that allow you to associate ruby symbols to arbitrary "display" values, thus allowing your code to think symbolically and unambiguously while giving you the means to easily display what end-users need to see. Additionally, symbols are associated with ordinal values, allowing easy storage/retrieval to persistent stores (databases, files, marshalling, etc) by saving the  Element#value as appropriate (String by default, Fixnum if you "persist_ordinally"). The primary aim of Elemental is to collect and abstract literals away from your code logic. There's an old programmer's wisdom that you should not encode your logic using literal values, especially those the end-user is exposed to. Complete details provided in README.txt http://github.com/mwlang/elemental/tree/master http://rubyforge.org/projects/elemental/ From Gem: ~~~ bash sudo gem install elemental ~~~ From Source: ~~~ bash gem install… read more


Rails has and belongs to many (habtm) demystified

Every time I have to implement a many-to-many relationship between Rails models, I seem to have to figure out how to do it effectively all over again. Especially as Rails seems to evolve the relational hooks with better support and elegance. Here, I will show a has_and_belongs_to_many strategy that works well for me. Along the way, I'll expose a few other minor tricks, such as adding a custom inflector for pluralizing your model or not adding the ID column on a table declaration. The following Browser Edit form is what we're going for. That is, having a list of Operating Systems to check off while editing a Browser object: ![Editing Browser View][1] First, the models: What I wanted, was a way to declare browsers (Firefox, Explorer, Opera, etc.) and associate them with one or more operating systems (OS X, Windows,… read more


Converting Oddmuse Wiki to Edgewall Trac

Our company began long ago with wiki's, but we chose the Oddmuse wiki way back when. These days, we're heavy users of Trac wiki because of its integrated ticket support system. So what to do with all those old wiki's that folks have stopped using and reading. The Oddmuse wikis still hold valuable data, but they have since become an administrative overhead to keep around, so I decided to convert them all to Edgewall's Trac. To get started, I needed to know how to get the data into Trac. The following links gave me an API I could utilize to create trac pages and content: * [Trac Data Models][1] * [The Data model Python code][2] Great! Except there's one small problem. I don't really know python all that well, even though I did do a bit of Zope development, oh,… read more


A model-free wizard

Maybe I'm taking the whole MVC thing too far, but I've been reading and learning both Ruby and Rails at a fairly fast clip and just when I thought I was getting the hang of what goes in models, views, and controllers respectively, along comes The Advanced Recipe for Rails book with a recipe for implementing a wizard that threw me for a loop here. This implementation just so happens to be based off acts_as_state_machine, which plugs into your model classes. And of course, the acts_as_wizard plugin wasn't too far behind! Well, asking myself whether the wizard logic *should* be allowed to bleed over into the model prompted me to see just how hard it was to build a wizard in a web interface anyhow (this is my first attempt at a multi-step workflow bit on the web). Most of… read more


Handling Date Entries

Separate inputs for a single Date Entry? pop-up Calendars? Enforce one way (i.e. enter in "mm/dd/yyyy" format)? What happened to the end-user perspective? User input parsing and validation is classic computer science and usability fodder, yet we seem to get ever more clever at making it more cumbersome to enter a date than to get a date! (I'll leave the pun implications to the reader...) ## The Rails Way Separating inputs into month, day, year drop down lists makes the user click three times with mouse (or worse, type, tab, type, tab, type. It looks cool and minimizes programming effort to get a guaranteed valid date entry, but before Rails came along, I haven't seen this entry style in practice since the days of IBM 3270 terminal applications! At least in those old applications, there was a predictive key parser… read more


Conway's Game of Life in CoffeeScript

I was recently invited by Jonathan Wallace to a local Code Retreat where the developers were going to tackle Tim Conway's famous Game of Life  Unfortunately, I was unable to attend, but the whole idea sparked my own self-exploration into both CoffeeScript and Middleman, which I had little practice and practical experience with.  You can find the resulting code in its entirety at https://github.com/mwlang/life_with_coffeescript I learned some interesting things about CoffeeScript along the way as well as DOM manipulation and JavaScript performance issues that are worth sharing. In case you have not seen the game of life before, below is a screen shot of the game in action with a world that is 25 x 25.   The above shows a simple form that allows the size of the world grid to be changed… read more