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Convert datamapper.org site to Jekyll, Markdown
* rely on Maruku as Markdown processor (we're using a couple of MD extensions that are not available in vanilla MD). Signed-off-by: Alex Coles <[email protected]>
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‎.gitignore

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output/*
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---
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layout: default
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title: File Not Found
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---
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<h1>Sorry, that file could not be found</h1>
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<p>We recently switched hosts, so some older links no longer exist.</p>
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<p>Try the menu above or see the <a href="http://wiki.github.com/datamapper/dm-core">wiki</a>.</p>

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pygments: true
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permalink: none

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---
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layout: default
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{{ content }}

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---
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extension: html
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filter: erb
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en-us">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
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<title>DataMapper - <%= @page.title %></title>
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<title>DataMapper - {{ page.title }}</title>
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<link rel="stylesheet" href="/css/site.css" type="text/css" media="screen, projection" />
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<link rel="stylesheet" href="/css/coderay.css" type="text/css" media="screen, projection" />
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<link rel="stylesheet" href="/css/code.css" type="text/css" media="screen, projection" />
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<!--[if lt IE 7]> <link rel="stylesheet" href="css/ie_hacks.css" type="text/css" media="screen, projection" /> <![endif]-->
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<link rel="alternate" type="application/rss+xml" title="News and Notes feed" href="/news.rss" />
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</head>
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<body id="<%= @page.body_id %>">
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<body id="home">
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<div id="content">
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<div id="header">
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<h1><a href="/">DataMapper</a></h1>
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</ul>
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</div>
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<%= @content %>
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{{ content }}
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<div id="footer">
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<p>Copyright Dan Kubb, Sam Smoot <%= Time.now.year %></p>
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<p>Copyright Dan Kubb, Sam Smoot 2009</p>
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<p>Web Design by <a href="http://www.mr-eel.com/">Luke Matthew Sutton</a> - Community Maintained</p>
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‎_posts/2008-03-22-the_great_refactoring.markdown

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---
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layout: articles
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categories: articles
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title: The Great Refactoring
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created_at: 2008-03-22T15:55:50-05:00
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summary: Change is afoot
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author: afrench and ssmoot
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---
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{{ page.title }}
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================
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"Tip" DataMapper (hosted on [github](http://github.com/datamapper/dm-core)) is
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going through a dramatic re-factor. Here's a quick summary of the anticipated
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NEW public API.
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Not Just for Databases Anymore
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------------------------------
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DataMapper's class terminology will change and 'de-couple' itself from
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database-specific terminology. Gone are "database", "table", "column" and
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"join". Say hello to "Repository", "Resource", "Property", and "Link".
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"Why would you want to do that?", you ask. Ultimately it's because DataMapper
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will soon support different types of persistence layers, not just databases.
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It'll talk to all sorts of things like web services (REST and such), XML files,
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YAML files, non-relational databases, even custom file-types or services of your
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own design. Just implement an Adapter that conforms to a certain API and
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DataMapper could support any type of data store. No need for a completely
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separate library or anything.
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As an added benefit, DataMapper become more "RESTful". [Ryan Tomayko](http://tomayko.com/writings/rest-to-my-wife)
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has a very good explanation
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of REST that all should read entitled [How I Explained REST to My Wife](http://tomayko.com/writings/rest-to-my-wife).
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Model Definitions Are a Little Different
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----------------------------------------
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Since we're changing up the terminology, model definitions are going to change
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up a little bit. Here's what a Planet model would look like using the new API:
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{% highlight ruby linenos %}
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class Planet
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include DataMapper::Resource
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resource_names[:legacy] = 'dying_planets'
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property :name, String
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property :age, Integer
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property :core, String, :private => true
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end
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{% endhighlight %}
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A couple of things are going on here. First, DataMapper::Base and
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DataMapper::Persistence are gone and replaced with <%=
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doc('DataMapper::Resource') %>. Next `set_table_name` has been replaced with
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`resource_names` hash where you specify which arena play occurs in. After that
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we have a couple of Property definitions that look a little different.
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First off, Properties will no longer take `:symbols` for their types and instead
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take real constants like String, Integer, DateTime. Also on the docket are the
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ability to define your own custom types.
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Think about that for a minute. If developers are able to define their own custom
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types with their own materialization and serialization methods, DataMapper will
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be able to support all kinds of wild data-types like GIS information, network
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information, marshaled objects, JSON...pretty much anything a developer might
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need, or want.
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A Command-Line Interface
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------------------------
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Taking a lesson from web frameworks, DataMapper will sport an interactive
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command-line so that you can browse your resources without the need to load up
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the entire environment of your application. Here's an example session:
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{% highlight bash linenos %}
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$ dm mysql://root@localhost/great_musicians # connecting to a repository
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{% endhighlight %}
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An IRB session boots up...
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{% highlight ruby %}
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>> the_king = Person.first(:name => 'elvis')
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>> the_king.alive? # => maybe
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{% endhighlight %}
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This is very similar to `script/console` in Rails or `merb -i` in Merb, only it
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won't load up the entire environment of your application, just your DataMapper
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resources and their associations, methods, and such. If you prefer "fat models",
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this will constitute the core of your application.
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How This All Comes Together
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---------------------------
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This is the coolest new feature of DataMapper: we're skipping all the way from
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0.3.0 to 0.9! Get excited, contact the press, fire up the blogosphere! Its a
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huge jump and we're honestly concerned that people may not be able to handle it.
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Alright, so it's not _that_ big of a deal, but we're confident that all of this
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will get DataMapper so close to going 1.0 that we'll be able to taste it. To get
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there, DataMapper's more advanced features like single table inheritance,
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paranoia, and chained associations will be re-implimented to use all this new
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stuff, and then we're sure 0.9 will need a touch up or two.
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So close....so very very close...
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Stay tuned in to the [mailing list](http://groups.google.com/group/datamapper),
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check up on the [wiki](http://datamapper.org/), chat it up in
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[#datamapper](irc://irc.freenode.net/#datamapper) and watch
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[github commit messages](http://github.com/datamapper/dm-core/commits/master) for updates.

‎_posts/2008-03-29-spotlight_on_cpk.markdown

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---
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layout: articles
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categories: articles
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title: Spotlight on... Composite Keys
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created_at: 2008-03-29T19:09:07-05:00
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summary: When a Primary Key Just Isn't Enough
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author: afrench and ssmoot
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---
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{{ page.title }}
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================
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For those of us who have taken a course on database design in college or
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university, you may have run across a concept called 'Composite Primary Keys'
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(or sometimes 'Compound Keys' or 'Concatenated Keys', and abbreviated
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CPK(Composite Primary Keys)s). It's usually right before you tackle JOINs and
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right after you fight with the "surrogate key" or "primary key" concept.
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Boiling CPK(Composite Primary Keys)s down, they're just a way of identifying a
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row by multiple keys rather than one. So instead of an auto_incrementing
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"serial" primary key (as in `id`), you'd have a combination of `some_column` and
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`some_other_column` that would uniquely identify a row.
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CPK(Composite Primary Keys)s aren't as prevalent in the Rails world as Serial
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Keys (such as the auto-incrementing `:id` column), but if you're going to
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support legacy, integration or reporting databases or just de-normalized schemas
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for performance reasons, they can be invaluable. So sure, Surrogate Keys are a
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great convenience, but sometimes they just aren't an option.
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Let's briefly take a look at how a few ruby ORMs support Composite Primary Keys
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and then we'll talk about DataMapper's support for CPK(Composite Primary Keys)s.
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ActiveRecord
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------------
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In short, ActiveRecord doesn't support CPK(Composite Primary Keys)s without the
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help of an external library. [Dr. Nic Williams](http://drnicwilliams.com/about/)
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[Composite Keys](http://compositekeys.rubyforge.org/) is an effort to overcome
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this limitation.
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Sequel
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------
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Unlike ActiveRecord, Sequel supports CPK(Composite Primary Keys)s natively:
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{% highlight ruby linenos %}
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class Post < Sequel::Model
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set_primary_key [ :category, :title ]
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end
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post = Post.get('ruby', 'hello world')
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post.key # => [ 'ruby', 'hello world' ]
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{% endhighlight %}
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p(attribution). example compiled from <http://code.google.com/p/ruby-sequel/wiki/SequelModels>.
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DataMapper
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----------
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The latest DataMapper was designed from the ground up to support CPK(Composite Primary Keys)s:
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{% highlight ruby linenos %}
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class Pig
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include DataMapper::Resource
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property :id, Integer, :key => true
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property :slug, String, :key => true
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property :name, String
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end
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pig = Pig.get(1, 'Porky')
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pig.key # => [ 1, 'Wilbur' ]
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{% endhighlight %}
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We declared our keys by adding the `:key => true` to the appropriate properties.
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The order is important as it will determine the order keys are addressed
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throughout the system.
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Next, we mixed and matched the keys' types. `:id` is a Integer, but `:slug` is a
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String. DataMapper didn't flinch when we defined a key column as a String
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because it supports [Natural Keys](http://en.wikipedia.org/wiki/Natural_key) as
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well.
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Lastly, when retrieving rows via `get` and `[]` with a CPK(Composite Primary
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Keys), we supplied the keys in the order they were defined within our model. For
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example, we defined `:id` first, then `:slug` second; later, we retrieved Porky
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by specifying his `:id` and `:slug` in the same order. Additionally, when we
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asked Wilbur for his keys, he handed us an array in the order the keys were
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defined.
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We didn't need to mix in an external library to get support for CPK(Composite
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Primary Keys)s, nor did we need to call a `set_primary_key` method and then
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supply more than one key to it. DataMapper supports Composite Primary Keys
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intuitively and without compromise!
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In later "Spotlight On..." articles, we'll examine and demonstrate other
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DataMapper features or persistence concepts as well as compare similar features
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with other ORMs or libraries.
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Contribute a "Spotlight On..." Article
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--------------------------------------
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p(newRelease). Got something important to say? Want something explained a little<br>
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better or demonstrated? Contribute or request a "Spotlight On..." <br> article!
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Email the [DataMapper Mailing List](http://groups.google.com/group/datamapper) with the request or <br>
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contribution and we'll post it here.

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