Despite reading and re-reading tutorial http://doc.silverstripe.org/framework/en/tutorials/2-extending-a-basic-site I can't see what I missed... but I think it's probably fairly fundamental...

I want to add a field (Jack) to my page type. So page.php says:

class Page extends SiteTree {

	private static $db = array();

	private static $has_one = array('SingleImage' => 'Image'								
	);
	
function getCMSFields() {
		$fields = parent::getCMSFields();
		$fields->addFieldToTab('Root.Jack',$uploadField = new UploadField($name = 'Jack', $title = 'JackRussell'));
		return $fields;
	}
}

And on my page I call the image:

$Jack

Can upload image in CMS using field 'Jack'. But no image on the page?!

Did I miss anything?

Hi Arthur,

Your has_one relation is named "SingleImage", but you're passing the name "Jack" to the form field (the first parameter). You need to either rename your has_one from "SingleImage" to "Jack", or pass "SingleImage" as the first parameter when you create the UploadField.

The same in the template: you're trying to get a relation named "Jack" when this doesn't exist - "SingleImage" is what the relation is named, so either use $SingleImage in the template or rename the has_one to "Jack".

Hope this helps,
Loz

Sweet! That cracked it!

Silly mistake of mine -- thanks for your help!

Now trying to get three image positions that client can load random images into!

class Page extends SiteTree {

	private static $db = array(							   
	);

	private static $has_one = array (
									 'JackLeft' => 'Image',
									 'JackCenter' => 'Image',
									 'JackRight' => 'Image'
	);
	
function getCMSFields() {
		$fields = parent::getCMSFields();
		$fields->addFieldToTab('Root.Jack Left',$uploadField = new UploadField($name = 'JackLeft', $title = 'Dr Jack Russell (left column)'));
		$fields->addFieldToTab('Root.Jack Center',$uploadField = new UploadField($name = 'JackCenter', $title = 'Dr Jack Russell (page center)'));
		$fields->addFieldToTab('Root.Jack Right',$uploadField = new UploadField($name = 'JackRight ', $title = 'Dr Jack Russell (right column)'));
		return $fields;
	}
}

And on Page.ss:

<div id="jack" class="row">
	<div class="col_3 first">$JackLeft</div>
	<div class="col_3">$JackCenter</div>
	<div class="col_3 last">$JackRight</div>
</div>

But no image? Also I need to get rid of 'alt' tag on these because it shows "assets/" when an image is not loaded... client will only use one position per page.

Any tips?