How to Display Shopify Variants on Collections Pages

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Summary

Issue: Shopify collection pages fail to display product variants due to incorrect Liquid template modifications in main-collection.liquid.
Root Cause: Misuse of content_for and incorrect variant loop implementation.
Impact: Broken collection pages, rendering errors, and missing variant data.

Root Cause

  • Incorrect content_for Usage: The content_for 'block', type: 'filters' block was mistakenly modified, causing Shopify to look for a non-existent blocks/filters.liquid file.
  • Variant Loop Misplacement: The variant loop was added within the product loop, breaking the product-grid rendering logic.
  • Class and Data Attribute Errors: Added variant-specific classes and attributes (--variant{{ forloop.index0 }}, data-variant-id) without proper handling.

Why This Happens in Real Systems

  • Lack of Shopify Liquid Documentation: Developers often assume Liquid behaves like PHP or other templating languages.
  • Overcomplication of Loops: Nesting loops without understanding Shopify’s rendering context leads to broken templates.
  • Theme-Specific Limitations: Ritual theme v3.2.1’s product-grid snippet does not natively support variant-level rendering.

Real-World Impact

  • Broken Collection Pages: Users cannot browse products, leading to lost sales.
  • Rendering Errors: Shopify throws errors for missing files (blocks/filters.liquid, snippets/product-grid.liquid).
  • Maintenance Overhead: Debugging custom Liquid code without proper documentation increases technical debt.

Example or Code (if necessary and relevant)

{% paginate collection.products by products_per_page %}
  {% for product in collection.products %}
    
  • 
      {% for variant in product.variants %}
        
    
          {{ variant.title }} - {{ variant.price | money }}
        
    
      {% endfor %}
      {% render 'product-card', product: product %}
    
    • 
  {% endfor %}
{% endpaginate %}

    How Senior Engineers Fix It

    • Isolate Variant Data: Render variants within the product card snippet (product-card.liquid) instead of the collection loop.
    • Use Proper Snippets: Replace content_for with direct render calls for filters and product cards.
    • Leverage Shopify APIs: Use product.selected_or_first_available_variant for default variant display.

    Why Juniors Miss It

    • Overlooking Shopify’s Rendering Context: Juniors assume nested loops work universally, ignoring Shopify’s theme architecture.
    • Ignoring Documentation: Failure to consult Shopify’s Liquid documentation or theme-specific guides.
    • Lack of Modular Thinking: Modifying core templates without creating reusable snippets or sections.

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