Reciprocal Data

[ptjedi]

Good evening,

I am trying to build a system that relates two pages (using a Page field) but assures that the related page also relates to the current page we're editing. Like if we were talking about synonyms.

Does anyone have a clue on how to achieve this?

Thanks!

[Soma]

Not sure if I understand right.

Edit:

If page field is limited to one page max you could also do this

if($page->related->related === $page){
// related page has this page also referenced
} else {
// it's not
}

Edit2:

corrected a previous example if multiple page field with better example

if(count($page->related)){
foreach($page->related as $rel){
       // check recursively if one of the related pages has this page in it's related pages 
	if($rel->related->has($page)){ 
		echo "<li>$rel->title</li>";// related page has this page also referenced
	} else {
		// it's not
	}
}
}

[diogo]

When you use a page field you can always relate the pages both ways. Only the way you call them is different.

You call B from A like this:

$page->pagefield

and A from B like this:

$pages->get('pagefield=$page')

where A is the page that has the page fieldType

[Soma]

Just rewrote my previous post multiple times... lol. Got little confused.

[ptjedi]

Thanks you both. I imagined something like that, and it will come handy when I am setting the template files for it.

However my question goes toward something that identifies in the backoffice that some page has been linked from another and therefore, holds a link to that page. Have any idea if this is feasable without touching core code?

[Soma]

Actually I'm recently working on a module that lists links to selected pages on a page field when on edit page after saving. Doing something else would be quite easy with one of the above methods. I'll have to pick it up see what I can share.

[apeisa]

Soma: sounds great. Make sure you support link abstract module links (those should be easier for you though).

[ptjedi]

Sounds great. Looking forward to test that module.

[Soma]

I quickly looked into it and created an additional hook for what you might after. There's my other already created ones you can also test and comment it if not needed.

It's a snippet I just posted here https://gist.github.com/2878361

Uncomment unwanted hooks int he init() method of the module.

The third hook...

$this->addHookAfter("InputfieldPageListSelect::render", $this, "findRelated");

does look for any pages that has the current edited page selected in a page select field. You can specify what field you want to attach it in the function findRelated(): $field_filter = "select_architect";

Let me know if it works for you.