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DataObjectManager Module /

Discuss the DataObjectManager module, and the related ImageGallery module.

Moderators: martimiz, UncleCheese, Sean, Ed, biapar, Willr, Ingo, swaiba

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14 Posts   2895 Views

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Samba Sam

Community Member, 85 Posts

12 February 2010 at 7:18pm

Hello,
On my home page I want to disply a large single testimonial image that randomly changes every time a visitor comes to the site.
Any suggestions on how to set that up. I can get as far as setting up testimonial data objects to create a gallery, I just don't know how to the display-a-singular-image randomly part.

Thanks in advance,
Sam

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patjnr

Community Member, 102 Posts

12 February 2010 at 9:07pm

Edited: 12/02/2010 9:09pm

Hi

a quick way (some thing like this)

in your Controller

	function MainShow(){
		$ThumbURL = DataObject::get('YourDataObject', '','Rand()','','1');
		return $ThumbURL;
	}


Template

<% control MainShow %>
    	
            <img src="$URL"  />
        
	<% end_control %>

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UncleCheese

Forum Moderator, 4102 Posts

13 February 2010 at 3:18am

Edited: 13/02/2010 3:19am

It's a little cleaner if you just return a single image. That way you don't need a control.

$ThumbURL = DataObject::get_one('YourDataObject', '',true,'Rand()');

<div>$MainShow</div>

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Samba Sam

Community Member, 85 Posts

14 February 2010 at 4:48pm

Thanks for the quick response, guys! Sam

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dhensby

Community Member, 253 Posts

15 February 2010 at 11:47am

Hmmm, depending on the scale of your site, sorting by RAND() is really bad. It's slow and really could cause problems if you have a lot of objects in the DB.

This is some code i use to get one random object:

function getRandomObject() {
                if ($do = DataObject::get('YourDataObject')) {
                        return $do->getRange(rand(0,$do->Count() - 1),1);
                }
        }

This uses php to pick a random object rather than MySQL.

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UncleCheese

Forum Moderator, 4102 Posts

15 February 2010 at 12:35pm

Looks like a lesser of two evils, here, guys. RAND() is hog on the DB side, no doubt, but getRange() isn't exactly the leanest function in the world, either. It creates a new set, and loops through the records it already has in memory, creating duplicates for the set matching your range.

If performance is really an issue, I think you might have to look outside of the Sapphire framework. For most sites, I think either of these solutions will be fine.

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Samba Sam

Community Member, 85 Posts

16 February 2010 at 3:35am

Edited: 16/02/2010 3:37am

Hi Folks,
So I can't get any of the previously suggested solutions to work.
Solution #1 (PatJnr) , I get no image, no code in template.

Solution #2 (Uncle Cheese) gives me the following error: Uncaught Exception: Object->__call(): the method 'fortemplate' does not exist on 'Testimonial'

Solution #3(Pigeon) I get a random number link (e.g., "#1") displaying with the following extra code inserted in the template:
<ul id="Menu1"><li onclick="location.href = this.getElementsByTagName('a')[0].href"><a href="">#1</a></li></ul>

Here is my code:
mysite/code/Testimonial.php

<?php
class Testimonial extends DataObject
{
static $db = array (
'Caption' => 'Varchar(50)'
);

static $has_one = array (
'TestimonialPage' => 'TestimonialPage',
'TestimonialImage' => 'Image'
);

public function getDOMThumbnail()
{
return $this->TestimonialImage()->CroppedImage(50,50);
}

function getCMSFields()
{
return new FieldSet(
new ImageField('TestimonialImage'),
new TextField('Caption','Caption')
);
}
}
?>
********************
mysite/code/TestimonialPage.php

<?php
class TestimonialPage extends Page {

static $has_many = array (
'Testimonials' => 'Testimonial'
);

function getCMSFields() {
$fields = parent::getCMSFields();
$manager = new ImageDataObjectManager(
$this,
'Testimonials',// Source name
'Testimonial',// Source class
'TestimonialImage',// File name on DataObject
array('Caption' => 'Caption'),
'getCMSFields'
);

$manager->setAllowedFileTypes(array('jpg'));
$manager->setBrowseButtonText("Upload (JPG only)");
$fields->addFieldToTab("Root.Content.Testimonials",$manager);
return $fields;
}

} /* end SiteTree */

class TestimonialPage_Controller extends Page_Controller {

/* example 2 */
function RandomTestimonial (){
$ImageURL = DataObject::get_one('Testimonial', '',true,'Rand()');
return $ImageURL; }
}

/* example 3 */
function getRandomObject() {
if ($do = DataObject::get('Testimonial')) {
return $do->getRange(rand(0,$do->Count() - 1),1);
}
}

} /* end Controller */
?>

************************
templates/layout/Testimonial.ss (example 2)
<div id="Mainbody">$RandomTestimonial</div>

templates/layout/Testimonial.ss (example 3)
<div id="Mainbody">$getRandomObject</div>

I wasn't sure if I was to give the object source name or class in the DataObject::get('Testimonial')) part. I tried doing both with no luck.

Anymore help would be greatly appreciated.
Thanks,
Sam

Avatar
bummzack

Community Member, 904 Posts

16 February 2010 at 4:13am

What you get by your function is the DataObject, not the image.
Either change your function to:

function RandomTestimonial (){
	if($dob = DataObject::get_one('Testimonial', '',true,'Rand()'))
		return $dob->TestimonialImage();

	return null;
} 

Or write something like this in your template:

<div id="Mainbody">$RandomTestimonial.TestimonialImage</div> 

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