Hi there,

I just wan't to know if it's possible to extend Silverstripe in one way:

In every Silverstripe installation you've the opporturnity to change the text e.g. in this way:

$Content.FirstSentence

$Content.LimitWordCountXML(10, read more)

Now, I need a custom function like

$Content.MyFancyFunction

I know this was possible if I will hack "sapphire/core/model/fieldtypes/Text.php" but this is not the way i wan't to go.
I've tried to "extend" with the Object::add_extension() method but in this case I will lose "$this->value" in my custom class because it has to extend from "Extension" and can not extend from the "Text"-Class.

Is there a way to do this without hacking the Silverstripe core?

You should be able to use the Extension class. You would then refer to your "$this->value" as you would in a subclass as $this->owner->value. $this->owner gives you the class the extension has been applied to.

The other option is to make a FirstSentence function in your Page.php and instead of using $Content use $FirstSentence in the template.

function FirstSentence() {
$content = $this->Content;

// do whatever you want
$text = ....;

return $text;

Thanks, Willr that's it.

I know your second option but I need in my case the "extension". :-)