Learn OOP with Perl

[cybersiddhu]

Scope

• Object oriented concepts such as class, object, attribute, method, polymorphism,inheritance, delegation etc.
• Only in the context of Perl using Moose and modern perl.
• Have to learn class composition which is Moose concept called Roles.

  Learning material

• Use the online modern perl book particularly the object oriented chapters.
• Also read the Moose tutorials in the manual.
• Search google there are plenty of tutorials around.

  Deliverables

• Design three classes, CD,Artist and Tracks.
• Create attribute, methods and relations between them.
• Write a perl library with these classes.
• Write a perl script to perform CRUD operations on them.
• Create Animal class. Create Bird,Duck,Lion,Tiger,Cat classes and inherit from Animal.
• Create a Speak Moose Role so that each animal can make sound using that. Use that Role to compose all animal classes.
• Write a script to demonstrate the Animal classes.
• Include them in the perl library previously created.
• Make a github repository of code and send the link.

[biodavidjm]

In order to learn OOP in Perl, I will export my itunes music database available through a XML file to a PostgreSQL database. The task will be broken in the following units:

1) Class XML_parser: it should take any XML file, parse it, and extract all the music information contained in the xml file. It should be design in a OO way, with the idea to be extended to any xml file from any music library provider.

2) Classes for music elements. I will create classes that will be able to extract the data from the XML_parser and be sent to the database. I will create the classes Band, Album, Song, Fan and Show, with all the required methods to manipulate the data.

3) Insert the data in the database by using DBI, which will allow the insertion the data in any data management system (PostgreSQL, oracle,...)

I'll work on 1) and 2) simultaneously. I also need to create a folder with this project's code somewhere in this project.

[biodavidjm]

2) Classes for music elements. Tasks

• [x] Create the skeleton with the attributes and methods for the Music Classes (Band, Album, Song, Fan and Show).
• [x] Learn and complete the methods on every class.
• [x] Learn the concept of unit tests and provide them.

[cybersiddhu]

Here is an example that might help https://gist.github.com/cybersiddhu/66f08564932973e55bc9 It shows

• Basics of using perl array and Moose's native attribute concepts.
• Basics of writing documentation using pod, should be present with every code.
• Basics of writing test with perl. It's good idea to write automated tests to test your classes instead of throwaway and ad-hoc perl scripts.

[biodavidjm]

The Perl Moose classes and unit test is available at the music_database project.