I pieced together this code from a few tutorials and was very happy
with it until I realised it has a bit of a flaw! The code is placed in
the app model, and automatically adds a .html extension, and turns the
name field into a suitable URL. It also checks whether the slug is
unique, if it isn't it will add a number before the slug so that it is
unique. (If there is already a number there, then it will keep looping
until it finds a unique number). All of this is done automatically,
with no code in the controller/view as long as there is a "slug" and a
"name" field.
So what's the problem? Problem is, when something is updated (i.e.
edit action), it sees the slug is not unique and adds a number... I
have solved this by specifying the fields to save in each edit
controller, but thought there must be an easier way to stop the code
running for every edit function? The thing I like about this is that
it requires no real setting up in the controllers. I know what I want
to do in pseudocode in terms of an if/else statement somewhere, but
cannot see how I could add it?
Here is the code anyway:
<?php
class AppModel extends Model
{
function beforeValidate() {
$modelName = $this->name; // Put the model's name in an easier to
read variable
// If there's a slug field present, auto-populate it
if ($this->hasField('slug')) {
if (isset($this->data[$modelName]['name'])) {
// If the model has a name, use that to make its slug
$this->data[$modelName]['slug'] = $this->createSlug($this-
>data[$modelName]['name']);
} else {
// Otherwise, use anything that'll give it a unique
identifier as it's easier for absolutely everything to use slugs -
less exceptions to the rules make for simplicity. I'm going to
serialise the data (turn the array into a string) and make an MD5 sum
of it (turn that into a few random-looking hex digits). Hopefully
this should be unique. I'd be worried if it wasn't.
$this->data[$modelName]['slug'] = md5(serialize($this->data
[$modelName]));
}
}
return TRUE; // Go ahead and validate the data
}
function createSlug ($string, $id=null) {
// Turn names such as "It's wrinkled!" into slugs such as "its-
wrinkled"
$slug = strtolower($string); // Make the string lowercase
$slug = str_replace('\'', '', $slug); // Take out apostraphes.
CakePHP takes care of escaping strings before putting them into SQL
queries. This is purely for aesthetic purposes - changing "that-s-
cool" into "thats-cool"
$slug = ereg_replace('[^[:alnum:]]+', '-', $slug); // Turn any group
of non-alphanumerics into a single hyphen
$slug = trim($slug, '-'); // Remove unnecessary hyphens from
beginning and end
$slug = $slug.".html"; // add html extension so pages appear static.
// Now loop through slugs, if there is an identical one - add a
number at the beginning.
$i = 0;
$params = array ();
$params ['conditions']= array();
$params ['conditions'][$this->name.'.slug']= $slug;
if (!is_null($id)) {
$params ['conditions']['not'] = array($this->name.'.id'=>$id);
}
while (count($this->find ('all',$params))) {
if (!preg_match ('/-{1}[0-9]+$/', $slug )) {
// trim .html extension so that number can be added:
$slug = substr_replace($slug ,"",-5);
// now reattach .html after number
$slug .= '-' . ++$i.'.html';
} else {
$slug = preg_replace ('/[0-9]+$/', ++$i, $slug );
}
$params ['conditions'][$this->name . '.slug']= $slug;
}
return $slug;
}
}
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