Renders related products from collections the of the current product in random order.

Shopify Random Related Products.liquid

{%- liquid

assign max_products         = 9
assign excluded_collections = 'frontpage,all' | split: ','

assign related_collection_1 = false
assign related_collection_2 = false
assign related_collection_3 = false
assign related_collection_4 = false
assign related_collection_5 = false

for _collection in product.collections
    unless excluded_collections contains _collection.handle
        if related_collection_1 == false
            assign related_collection_1 = _collection
        elsif related_collection_2 == false
            assign related_collection_2 = _collection
        elsif related_collection_3 == false
            assign related_collection_3 = _collection
        elsif related_collection_4 == false
            assign related_collection_4 = _collection
        elsif related_collection_5 == false
            assign related_collection_5 = _collection
        endif
    endunless
endfor

assign product_handles_str = ''
assign min                 = 1
assign max                 = 10
assign diff                = max | minus: min

if related_collection_1
    for _product in related_collection_1.products 
        assign chance = "now" | date: "%N" | modulo: diff | plus: min
        if _product.handle == product.handle
            continue
        endif
        if product_handles_str contains _product.handle
            continue
        endif
        if chance >= 5
            assign product_handles_str = product_handles_str | append: ',' | append: _product.handle
        else
            assign product_handles_str = product_handles_str | prepend: _product.handle | prepend: ','
        endif
    endfor
endif

if related_collection_2
    for _product in related_collection_2.products 
        assign chance = "now" | date: "%N" | modulo: diff | plus: min
        if _product.handle == product.handle
            continue
        endif
        if product_handles_str contains _product.handle
            continue
        endif
        if chance >= 5
            assign product_handles_str = product_handles_str | append: ',' | append: _product.handle
        else
            assign product_handles_str = product_handles_str | prepend: _product.handle | prepend: ','
        endif
    endfor
endif

if related_collection_3
    for _product in related_collection_3.products 
        assign chance = "now" | date: "%N" | modulo: diff | plus: min
        if _product.handle == product.handle
            continue
        endif
        if product_handles_str contains _product.handle
            continue
        endif
        if chance >= 5
            assign product_handles_str = product_handles_str | append: ',' | append: _product.handle
        else
            assign product_handles_str = product_handles_str | prepend: _product.handle | prepend: ','
        endif
    endfor
endif

if related_collection_4
    for _product in related_collection_4.products 
        assign chance = "now" | date: "%N" | modulo: diff | plus: min
        if _product.handle == product.handle
            continue
        endif
        if product_handles_str contains _product.handle
            continue
        endif
        if chance >= 5
            assign product_handles_str = product_handles_str | append: ',' | append: _product.handle
        else
            assign product_handles_str = product_handles_str | prepend: _product.handle | prepend: ','
        endif
    endfor
endif

if related_collection_5
    for _product in related_collection_5.products 
        assign chance = "now" | date: "%N" | modulo: diff | plus: min
        if _product.handle == product.handle
            continue
        endif
        if product_handles_str contains _product.handle
            continue
        endif
        if chance >= 5
            assign product_handles_str = product_handles_str | append: ',' | append: _product.handle
        else
            assign product_handles_str = product_handles_str | prepend: _product.handle | prepend: ','
        endif
    endfor
endif


assign related_products = false

if product_handles_str != ''
    
    assign first_char = product_handles_str | slice: 0
    if first_char == ','
        assign product_handles_str = product_handles_str | remove_first: ','
    endif

    assign related_handles_str     = ''
    assign rendered_count          = 0
    assign product_handles_array   = product_handles_str | split: ','
    assign min                     = 1
    assign max                     = product_handles_array | size
    assign diff                    = max | minus: min
    assign loops                   = 1000
    if max <= max_products
        assign loops = 100
    endif

    for i in (1..loops)
        assign pluck   = "now" | date: "%N" | modulo: diff | plus: min
        assign _handle =  product_handles_array | slice: pluck, 1
        
        if rendered_count >= max_products
            break
        endif
        if related_handles_str contains _handle
            continue
        endif

        assign related_handles_str = related_handles_str | append: ',' | append: _handle
        assign rendered_count          = rendered_count | plus: 1

    endfor

    assign first_char = related_handles_str | slice: 0
    if first_char == ','
        assign related_handles_str = related_handles_str | remove_first: ','
    endif

    assign related_products = related_handles_str | replace: '[', '' | replace: ']', '' | replace: '"', '' | split: ','
endif

-%}
{%- if related_products -%}
<section>
    {%- for _handle in related_products -%}
        {%- assign _product = all_products[_handle] -%}
        {%- comment -%} DO WHAT YOU WANT HERE WITH "_product" {%- endcomment -%}
    {%- endfor -%}
</section>
{%- endif -%}