I'm hoping I can get a bit of direction on this, hopefully I'm just missing something obvious.

I'm trying to integrate the sortable data object functionality. I have in my

/mysite/_config
SortableDataObject::add_sortable_classes(array('Link'));

I've run the flush and the new SortOrder column was created fine.

Nothing happens on the front end though.

So I've added this to the template, /themes/mytheme/templates/Includes/Links.ss
{$Links.BeginSortableUL}
<% if Links %>
<% control Links %>
{$LI}
<% if ExternalLink %>
<a href="$ExternalLink" target="_blank">$LinkTitle</a>
<% else %>
<a href="$Link.Link">$LinkTitle</a>
<% end_if %>
<br />
{$_LI}
<% end_control %>
<% end_if %>
{$Links.EndSortableUL}

Still no changes.

So then I thought maybe I need to use add_sortable_many_many_relation, because it is.
From /mysite/Page.php
   
static $has_many = array(
'Blocks' => 'Block',
'Links' => 'Link'
);

$tablefield = new DataObjectManager(
$this,
'Links',
'Link',
array(
// 'LinkedPage' => 'Internal Link',
// 'ExternalLink' => 'External Link',
'LinkTitle' => 'Link Text'
),
'getCMSFields_linkPopup'
);
$fields->addFieldToTab('Root.Content.Links', $tablefield);

/mysite/LinkPage.php
<?php
class Link extends DataObject{

static $db = array(
'ExternalLink' => 'Text',
'LinkTitle' => 'Text'
);

static $has_one = array(
'Page' => 'Page',
'Link' => 'SiteTree'
);

function getCMSFields(){

return new Fieldset(
new TreeDropdownField('LinkID','Internal Link','SiteTree'),
new TextField('ExternalLink','External Link (overrides internal link)'),
new TextField('LinkTitle')
);
}
}
?>

So I change my _config.php to
SortableDataObject::add_sortable_many_many_relation('Page','Link');
or also try
SortableDataObject::add_sortable_classes(array('Link'));
SortableDataObject::add_sortable_many_many_relation('Page','Link');
as I'm not quite sure what the correct syntax is.

Then I get this error (with either of the above entries in _config.php):

Fatal error: Uncaught exception 'ReflectionException' with message 'Class does not exist' in /public_html/aston/sapphire/core/Object.php:385 Stack trace: #0 /public_html/aston/sapphire/core/Object.php(385): ReflectionClass->__construct('') #1 /public_html/aston/sapphire/core/Object.php(543): Object::uninherited_static(NULL, 'extensions') #2 /public_html/aston/dataobject_manager/code/SortableDataObject.php(19): Object::add_extension(NULL, 'SortableDataObj...') #3 /public_html/aston/dataobject_manager/code/SortableDataObject.php(52): SortableDataObject::add_sortable_class(NULL) #4 /public_html/aston/mysite/_config.php(40): SortableDataObject::add_sortable_many_many_relation('Page', 'Link') #5 /var/tmp/silverstripe-cache-home1-resolut1-public_html-aston/manifest-main(8249): require_once('/home1/resolut1...') #6 /public_html/aston/sapphire/core/ManifestBuilder.php(74): require_once('/var/tmp/silver...') #7 /home1/resolut1 in /public_html/aston/sapphire/core/Object.php on line 385

This on a otherwise blank screen.

I'm using 2.4.2, and I flush the front and db regularly.

Any help would be much appreciated!

Hi Uncle Cheese!

First off, I'm a big fan, thanks for all the great modules you've crafted.

I tried it without the code in the template and I still can't get anything to happen on the front end, I must be missing something obvious.

This is my _config.php code now:
SortableDataObject::add_sortable_classes(array('Link'));

Then my frontend template is
<% if Links %>
<% control Links %>
<% if ExternalLink %>
<a href="$ExternalLink" target="_blank">$LinkTitle</a>
<% else %>
<a href="$Link.Link">$LinkTitle</a>
<% end_if %>
<br />
<% end_control %>
<% end_if %>

This is where I originally got the templating code:
http://doc.silverstripe.org/modules:sortabledataobject

Originally I followed the instructions that make more sense for the current setup from
http://doc.silverstripe.org/modules:dataobjectmanager
under the 'Activate Drag and Drop Sorting'

I don't see any changes on the front end.

When I add /sort to the url, I get 'Page not Found'. I'm sure that it gets as far as the add_sortable_classes function in the SortableDataObject.php file.

I'm not sure what else I should do to make this start working?

Thanks so much for you earlier response!

Thanks for replying Ryan-

I'm not using any custom functions to get this dataobject, just this:

<?php
class Link extends DataObject{

static $db = array(
'ExternalLink' => 'Text',
'LinkTitle' => 'Text'
);

static $has_one = array(
'Page' => 'Page',
'Link' => 'SiteTree'
);

function getCMSFields(){

return new Fieldset(
new TreeDropdownField('LinkID','Internal Link','SiteTree'),
new TextField('ExternalLink','External Link (overrides internal link)'),
new TextField('LinkTitle')
);
}
}
?>

Oh wow, doh!

You're right it is working effortlessly on the backend, probably has been this whole time.

Thanks for your patience, and the great modules!