Product Order Limits (Minimum and Maximum) - Free Tutorial

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