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In this customization, we are adding product order limits, so you can set the maximums and minimums that customers can buy.

You might not want your customers to over-order a promotion so you can set a maximum. Or if you need to save on shipping costs you can set a minimum so they purchase in multiples.

Normally this is a feature that you have to pay for by installing an app, but in this video I’m going to show how to add it to your store for free.

Compatible Themes: This code should work on all free Shopify themes (Dawn, Refresh, Craft, Studio, Publisher, Crave, Origin, Taste, Colorblock, Sense, Ride, Spotlight).

Create metaobject and metafields

Create quantity_rule metaobject with fields name, increment, min, and max
- required
- integer, min value 1
Create Product metafield quantity_rule with metaobject type quantity_rule
Create Variant metafield quantity_rule with metaobject type quantity_rule
Create metaobject entries

Edit Theme Code

Edit settings_schema.json

  {
    "name": "Custom Quantity Rules",
    "settings": [
      {
        "type": "checkbox",
        "id": "use_quantity_rules",
        "label": "Enable custom quantity rules",
        "default": false
      },
      {
        "type": "checkbox",
        "id": "use_total_product_quantity",
        "label": "Use total product quantity",
        "info": "Add the total of all variant quantities together",
        "default": false
      }
    ]
  }

Edit main-cart-items.liquid and cart-drawer.liquid

Replace item.variant.quantity_rule with quantity_rule

Add the following code:

{%- if settings.use_quantity_rules -%}
  {%- if settings.use_total_product_quantity -%}
    {% assign quantity_rule = item.product.metafields.custom.quantity_rule.value %}
    {% assign total_product_quantity = 0 %}
    {% assign global_max = item.product.metafields.custom.quantity_rule.value.max | plus: 0 %}
    {% for cart_item in cart.items %}
      {% if cart_item.product.id == item.product.id %}
        {% assign total_product_quantity = total_product_quantity | plus: cart_item.quantity %}
      {% endif %}
    {% endfor %}
    {% assign item_remaining_qty = global_max | minus: total_product_quantity %}
    {% assign max_for_variant = item.quantity | plus: item_remaining_qty %}
    {% if max_for_variant > global_max %}
      {% assign max_for_variant = global_max %}
    {% endif %}
   {% else %}
     {% assign quantity_rule = item.product.selected_or_first_available_variant.metafields.custom.quantity_rule.value %}
  {% endif %}
{% else %}
  {% assign quantity_rule = item.variant.quantity_rule %}
{% endif %}

Replace the input max max="{{ quantity_rule.max }}" with:

{% if settings.use_total_product_quantity %}
  max="{{ max_for_variant }}"
{% else %}
  max="{{ quantity_rule.max }}"
{% endif %}

Edit main-product.liquid

Replace product.selected_or_first_available_variant.quantity_rule with quantity_rule