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+--- Thread: [Solution] Extending libraries: proper locations for the Classname and MY_Classname library files (/showthread.php?tid=24249)
[Solution] Extending libraries: proper locations for the Classname and MY_Classname library files - El Forum - 11-04-2009
[eluser]aidehua[/eluser]
This is probably second nature to most of you, but I've just spent an hour trying to figure it out so I thought I'd post it here in case it might save someone else five minutes down the line.
(I was using Simon Maddox's Twitter class (available at http://github.com/simonmaddox/codeigniter-twitter), but I think this would apply to any library class in CodeIgniter.)
First up I downloaded the class file (Twitter.php) and saved it in my application/libraries folder.
I was able to load it successfully from the controller in the usual way:
Code:
$this->load->library('twitter');But then I wanted to extend the class a little bit, so I created a new class and called it MY_Twitter.php (as documented at http://ellislab.com/codeigniter/user-guide/general/creating_libraries.html).
I saved my new class in the application/libraries folder.
I then tried to load the extended library from the controller, again as per the documentation, in the normal way:
Code:
$this->load->library('twitter');This returned an error: "Unable to load the requested class: Twitter"
After much experimenting, I found the solution: I moved the Twitter.php file out of the application/libraries folder, and into the system/libraries folder, so that I now had:
codeigniter/system/libraries/Twitter.php
codeigniter/application/libraries/MY_Twitter.php
It now works just fine.
I wonder if the documentation might make more explicit the following point:
"3rd-party" library classes should be saved in the system/libraries folder. (Extensions to 3rd-party library classes, using the MY_ prefix, should be saved in the application/libraries folder.
PS This post is about library classes in general, not specifically about this Twitter class. But, for what it's worth, my new class looked like this:
Code:
<?
class MY_Twitter extends Twitter {
/* Edit the user and pass variables as appropriate */
public $user = '[twitterusername]';
public $pass = '[password]';
function get_current_status($status){
/* Returns the user's current status message and the date/time it was created */
$status = $this->user_timeline($this->user,2);
return array(
'text'=>$status[0]->text,
'created_at'=>$status[0]->created_at
);
}
function tweet($thetweet){
/* Makes tweeting as easy as saying tweet("Oh what a lovely morning") */
$this->auth($this->user,$this->pass);
$this->update($thetweet);
}
}[Solution] Extending libraries: proper locations for the Classname and MY_Classname library files - El Forum - 11-04-2009
[eluser]pistolPete[/eluser]
Extending a class using the MY_ prefix is reserved to core classes only: http://ellislab.com/codeigniter/user-guide/general/core_classes.html
If you need to extend a library which resides in ./application/libraries/ you either need to autoload the base class or use standard PHP require().
[Solution] Extending libraries: proper locations for the Classname and MY_Classname library files - El Forum - 11-04-2009
[eluser]aidehua[/eluser]
Thanks for clarifying.
Are you saying you advise AGAINST putting a 3rd-party library (like, in my example, Simon Maddox's Twitter.php) into ./system/libraries/?
Or, if taking the require() route, do you mean requiring the Someclass.php file from within the MY_Someclass.php file, like this?
Code:
<?php
require ('Someclass.php');
class MY_Someclass extends Someclass{
function someFunction(){
}
}Then presumably in the controller you'd have to load the MY_ class rather than the original:
Code:
$this->load->library('MY_Someclass');