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quantity_rule

Available as variant.quantity_rule. The object is always present: min defaults to 1, max is nil when there is no configured maximum, and the current Sellerlane catalog contract always exposes increment = 1.

Quantity input

{% assign rule = variant.quantity_rule %}
<input
  type="number"
  name="quantity"
  min="{{ rule.min }}"
  step="{{ rule.increment }}"
  {% if rule.max %}max="{{ rule.max }}"{% endif %}
>

For the default rule, the effective values are:

min = 1
max = nil
increment = 1

For a rule with min = 5, max = 100, and the current increment = 1, valid line quantities are the integers from 5 through 100.

Validate with the form tag

{% assign variant = product.selected_or_first_available_variant %}
{% assign rule = variant.quantity_rule %}


{% form 'product', product %}
  <input type="hidden" name="id" value="{{ variant.id }}">
  <input
    type="number"
    name="quantity"
    value="{{ rule.min }}"
    min="{{ rule.min }}"
    step="{{ rule.increment }}"
    {% if rule.max %}max="{{ rule.max }}"{% endif %}
  >
  <button type="submit">Add to cart</button>
{% endform %}

HTML attributes improve the buyer experience, but the cart backend remains authoritative for configured minimum and maximum order quantities, including requests submitted without this HTML. Sellerlane does not yet persist or validate a custom increment; do not document or render a step other than the Drop’s current value of 1.

Quantity rules are universal catalog rules in Sellerlane. B2B catalog-specific quantity contexts are intentionally unavailable.

Properties

PropertyDescription
quantity_rule.incrementCurrent purchase step; always 1 until catalog and cart APIs support custom increments.
quantity_rule.maxMaximum purchasable quantity, or nil when there is no maximum.
quantity_rule.minMinimum purchasable quantity.

Property list is generated from the storefront engine (QuantityRuleDrop), so it always matches what your theme can use. Use {{ variant.quantity_rule | json }} only as a curated debug snapshot; it can omit lazy or otherwise public properties.