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https://www.shopify.com/partners/blog/89205510-how-to-use-all_products-in-a-shopify-theme

{% for product in collections['the-celebration-collection'].products%}
{{ product.title }}

  {% if product.title == 'Belle of the Ball' %}
    222
  {% endif %}

{% endfor %}

——

{% assign products = product.metafields.product.related | split: ',' %}
{% for item in products %}
    {% assign prod = all_products[item] %}
      <li>
        <label>
          <a href="{{prod.url}}" class="swatch">
            <div   {% if product.url == prod.url %} class="color_swatch_active" {% else %} class="color_swatch" {% endif %} title="{{prod.title }}"><img src="{{ prod.featured_image | img_url: '110x' }}" alt="{{ prod.title }}" /></div>
          </a>
        </label>
      </li>
{% endfor %}