Galaxia, Games, MPOGs, Programming, Ruby on Rails, Technology, Web Programming

Using “type” in Ruby on Rails

<![CDATA[By default Rails applies special meaning to certain fields in a database table. One of these fields is "type". The type fields is used by Rails to create a "single table inheritance model". This sounds fairly complicated and is best explained with an example:

Imagine a forum system. A forum will have threads and replies. Threads and replies are different and have different functionality, but certainly share a lot of characteristics. So you might create a class message with two sub classes: replies and threads.

In Rails you can store all these in one messages table with a type field set to either reply" or thread. When you load a message it will actually create either a reply or thread object (in stead of a message object). When you create a new object it stores it in the messages table with the correct type.

This is ideal for Galaxia. In fact it's the model I used all along – I just had to write the functionality myself.

Single Table Inheritance, OOP, MVC, Ruby, Rails]]>

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s