perch:different inside perch:related

In case you're wondering why I would need to do this, it's because the various filters are in a hierarchy. Types depend on size, sizes depend on brand:

                <div class="prodCat">
                    <?php if (perch_get('cat') !== 'ring-and-pinion') {echo '<a href="/products?cat=ring-and-pinion">';} ?><h5 class="icon-chevron-right">Ring & Pinion</h5><?php if (perch_get('cat') !== 'ring-and-pinion') {echo '</a>';} ?>
                    <?php if (perch_get('cat') === 'ring-and-pinion') { ?>
                    <div>
                        <div class="sort">
                            <span>Differential Brand</span>
                            <ul><?php 
                                PerchSystem::set_var('sort_curr_url', '/products?cat=ring-and-pinion&brand='); 
                                if (perch_get('brand')) { PerchSystem::set_var('sort_curr_slug', perch_get('brand')); }
                                perch_collection('Sort - Differential Brand'); 
                            ?></ul>
                        </div>
                        <?php if (perch_get('brand')) { ?>
                        <div class="sort">
                            <span>Gear Size</span>
                            <ul><?php 
                                PerchSystem::set_var('sort_curr_url', '/products?cat=ring-and-pinion&brand='.perch_get('brand').'&size='); 
                                if (perch_get('size')) { PerchSystem::set_var('sort_curr_slug', perch_get('size')); }
                                perch_collection('Ring & Pinion - Family',[
                                    'filter' => 'differential_brand.slug',
                                  'match'  => 'eq',
                                  'value'  => perch_get('brand'),
                                    'template'=>'_get/_rp-gear_sizes.html',
                                ]); 
                            ?></ul>
                        </div>
                        <?php if (perch_get('size')) { ?>
                        <div class="sort">
                            <span>Gear Type</span>
                            <ul><?php 
                                PerchSystem::set_var('sort_curr_url', '/products?cat=ring-and-pinion&brand='.perch_get('brand').'&size='.perch_get('size').'&type='); 
                                if (perch_get('type')) { PerchSystem::set_var('sort_curr_slug', perch_get('type')); }
                                perch_collection('Ring & Pinion - Family',[
                                    'filter' => [
                                        [
                                            'filter' => 'differential_brand.slug',
                                          'match'  => 'eq',
                                          'value'  => perch_get('brand'),
                                        ],
                                        [
                                            'filter' => 'gear_size.slug',
                                          'match'  => 'eq',
                                          'value'  => perch_get('size'),
                                        ],
                                    ],
                                    'template'=>'_get/_rp-gear_types.html',
                                ]); 
                                ?></ul>
                        </div>
                        <?php } } ?>
                    </div>
                    <?php } ?>
                </div>

Do you mean sort the perch:related? I thought the only sort option for that was sort="custom". I added that, no change. Also tried:

                                perch_collection('Ring & Pinion - Family',[
                                    'filter'=>'differential_brand.slug',
                                  'match'=>'eq',
                                  'value'=>perch_get('brand'),
                                    'template'=>'_get/_rp-gear_sizes.html',
                                    'sort'=>'differential_brand.slug',
                                    'sort-order'=>'ASC',
                                ]); 

No change, and it seems using the perch:related dot syntax for the sort ID doesn't do anything either, as changing the order from ASC to DESC made no change.

perch:related seems to output in alphabetical order, so they are in order. It's outputting items with the same slug in order, even with different in place.

Yes, that's right. Is different supposed to work inside of perch:related?

If I use skip-template and put the results in an array, can I compare the [gear_size] array somehow, remove duplicates, and then output the templated results? These items will always be related to only one gear size, so if they have identical [gear_size] arrays, then the duplicates can be removed. This is just beyond my PHP abilities. Here's what the array looks like. You can see the last two items have identical [gear_size] arrays.

Array
(
    [0] => Array
        (
            [_id] => 68
            [title] => Ford 8.8"
            [_title] => Ford 8.8"
            [slug] => ford-8-8
            [ring_gear_diameter] => 
            [ring_gear_bolts] => 12 - 7/16"X20 RH
            [cover_bolts] => 10
            [carrier_breaks] => N/A
            [pinion_shaft_diameter] => 1.625"
            [spline] => 28
            [differential_brand] => Array
                (
                    [0] => 26
                )

            [gear_size] => Array
                (
                    [0] => 34
                )

            [gear_type] => Array
                (
                    [0] => 41
                )

            [_sortvalue] => 1002
        )

    [1] => Array
        (
            [_id] => 67
            [title] => Ford 8”
            [_title] => Ford 8”
            [slug] => ford-8
            [ring_gear_diameter] => 8.0"
            [ring_gear_bolts] => 10 - 7/16"X20 RH
            [cover_bolts] => N/A
            [carrier_breaks] => N/A
            [pinion_shaft_diameter] => 1.88"
            [spline] => 25
            [differential_brand] => Array
                (
                    [0] => 26
                )

            [gear_size] => Array
                (
                    [0] => 31
                )

            [gear_type] => Array
                (
                    [0] => 41
                )

            [_sortvalue] => 1003
        )

    [2] => Array
        (
            [_id] => 43
            [title] => Ford 9"
            [_title] => Ford 9"
            [slug] => ford-9
            [ring_gear_diameter] => 9.0"
            [ring_gear_bolts] => 10 - 7/16"X20 RH
            [cover_bolts] => N/A
            [carrier_breaks] => N/A
            [pinion_shaft_diameter] => 1.312"
            [spline] => 28
            [differential_brand] => Array
                (
                    [0] => 26
                )

            [gear_size] => Array
                (
                    [0] => 28
                )

            [gear_type] => Array
                (
                    [0] => 41
                )

            [_sortvalue] => 1004
        )

    [3] => Array
        (
            [_id] => 44
            [title] => Ford 9" PRO
            [_title] => Ford 9" PRO
            [slug] => ford-9-pro
            [ring_gear_diameter] => 9.0"
            [ring_gear_bolts] => 10 - 7/16"X20 RH - 10 - 1/2"X20 RH
            [cover_bolts] => N/A
            [carrier_breaks] => N/A
            [pinion_shaft_diameter] => 1.312" / 1.5"
            [spline] => 28 / 35
            [differential_brand] => Array
                (
                    [0] => 26
                )

            [gear_size] => Array
                (
                    [0] => 28
                )

            [gear_type] => Array
                (
                    [0] => 42
                )

            [_sortvalue] => 1005
        )

)

If anyone has any ideas what that might look like...I'm all ears. :)

Shane,

for each Ring & Pinion - Family item, how many gear_sizes are assigned? From your skip-template result, it looks as if only one gear_size is selected for each item?

Yes Duncan, that's correct. Each item will only have one gear size related.

Duncan, you're absolutely right, I can't believe I didn't realize that! I don't think it's possible to compare the related content outside of perch:related, though. This isn't working:

<perch:if different="gear_size.slug"><perch:related id="gear_size" collection="Sort - Gear Size" label="Gear Size" size="m"><perch:template path="content/sort/sort_cat.html" /></perch:related></perch:if>

Doesn't output anything at all. I think the dot syntax only works in page functions. Drew, can you weigh in here to let us know if that should work? Would be great to be able to do this!

Scratch that, this works!

<perch:if different="gear_size"><perch:related id="gear_size" collection="Sort - Gear Size" label="Gear Size" size="m"><perch:template path="content/sort/sort_cat.html" /></perch:related></perch:if>

Thanks for the help!

Ah, yes, that would work!

I didn't think the dot syntax would work - it's down to fact that the related item could have multiple entries. Multiple entries would affect your solution too, but if you know it will only have one, you should be OK. You can also use max="1" to force it to only accept one entry.

Good idea. Thanks again, Duncan!