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Paginate categories inside collection

Is it possible to paginate categories that are stored inside a collection item?

For example:

  • I have a collection called Flooring Industries, which could be made up of things like Hotels, Retail, Education, etc.
  • Each Flooring Industry collection has flooring 'categories' attached to it e.g. Retail might have flooring line categories such as Lines, Stripes, Squares, etc.

I need to show each industry, and its associated categories.

On an example page, Andover and Fernlea are flooring lines (Perch categories) attached to the Serviced Offices collection. I would like to paginate the categories here.

I initially thought that if I paginate the collection this would work, but instead, Perch paginates the collection item. e.g. something like the following would paginate Hotels, Retail, Education, rather than Lines, Stripes, Squares:

perch_collection('Flooring Catalogue Industries', [
    'filter'        => 'name_link',
    'match'         => 'eq',
    'value'         => perch_get('level3'),
    'template'      => 'flooring_catalogue/industries/industry_categories.html',
    'paginate'      => true,
    'count'         => 1,
]);

So what I need to do is paginate the categories inside this collection.

My guess is that:

  1. I might have missed something obvious and this is easily achieved, or…
  2. I might need to do something with a callback

Any suggestions appreciated!
Jay George

Jay George 2 points

  • 2 years ago
Hussein Al Hammad

Hussein Al Hammad 105 points
Registered Developer

2 years ago

Hello Jay,

I initially thought that if I paginate the collection this would work, but instead, Perch paginates the collection item

perch_collection() gets you Collection items. perch_categories() gets you Categories. So if you need to paginate Categories, you ultimately need to use perch_categories().

What you can do in this case is retrieve the Collection items with perch_collection() and use the skip-template option. Grab all the used categories in PHP, then use them to filter the categories with perch_categories().

$items = perch_collection('Flooring Catalogue Industries', [
'skip-template' => true,
]);

// grab the categories from $items

// use perch_categories() to output the categories (paginated and filtered)
Jay George

Jay George 2 points

2 years ago

Thanks, Hussein! That makes sense.

I'm currently stuck on how to grab just the categories from the array. So I have this:

$items = perch_collection (
    'Flooring Catalogue Industries', [
        'skip-template' => true,
        'filter'        => 'slug',
        'match'         => 'eq',
        'value'         => perch_get('level3'),
    ]
);

…which gets me the correct collection record for the page.

How would I drill down further, just to grab the categories from that collection?

Thanks again for your help
Hussein Al Hammad

Hussein Al Hammad 105 points
Registered Developer

2 years ago

You can check what you have with:

print '<pre>';
print_r($items);
print '</pre>';

Something roughly like this should do the trick:

$categories = array();

// Loop through $items
foreach($items as $item) {
    // loop through categories if exist for $item
    if(isset($item['categories'])) {
        foreach($item['categories'] as $cat) {
            $categories[] = $cat;
        }
    }
}


// remove duplicates
$categories = array_unique($categories);


// display categories
perch_categories([
    'filter' => 'catPath', // or catID depending on what you get in $items
    'match' => 'in',
    'value' => implode(',', $categories),
    'paginate' => true
]);

Here $item['categories'] refers to $item['field_id']. So assuming your categories field has the id categories:

<perch:categories id="categories" label="Categories" set="flooring" />
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