Shopify’s variant system works beautifully for straightforward products. T-shirts in different colors, shoes in different sizes, and similar product variations. But when trying to account for products with complex options like: dimensional calculations, manufacturing constraints, or interdependent options, variants start to fall apart.
This is where many businesses assume Shopify won’t work for them.
We ran into this with a rebar fabrication company that had never sold their products online before. All their orders came through phone calls or word-of-mouth: someone would describe what they needed, the shop would verify it was viable to manufacture, calculate dimensions, and quote a price. It worked, but it didn’t scale, and that’s where we came in.
Our goal wasn’t just to put their products on Shopify. It was to migrate their specialized manufacturing knowledge from living in people’s heads and in spreadsheets, into something customers could use on their own, with all the proper guardrails put in place automatically.
Creating an Intelligent Storefront
In the case of this business, each of their custom rebar shapes has specific constraints: some can handle two bends, others only one, and others allow for none at all. There were dimensional limits, varying thickness options by shape, and combinations that looked fine on paper but couldn’t actually be produced. Until we entered the picture, this had always served as a reason to continue doing everything by hand, because it was just simpler and more fail-safe.
Consider this example: A customer calls wanting a #4 rebar bent into a specific stirrup shape. Before they even finish describing it, the shop knows it won’t work – that 10mm thickness can’t handle that bend radius. But how do you encode that knowledge into a website?
Our goal was to integrate as much of their internal decision making process as possible into their storefront, and take e-commerce from a logistical nightmare into something that actually made their lives easier.
Variants as Tolerance Ranges
The crux of our solution to this problem began with making each custom rebar shape its own product.
Using JavaScript for real-time calculations, and Shopify’s AJAX API for dynamic pricing updates, we built a form that enforced different rules and provided different options based on which product was selected. That means that the variants didn’t represent exact lengths, they represented ranges, and the calculator handled all the complex math and business rules.
For example: if a customer needed a piece that totaled 14.2 inches after all the twists and turns were accounted for, the calculator was given length ranges as variants –14″, 14.5″, 15″ – and each time the length was adjusted, it just needed to round up to the nearest variant. The result was honest, responsive pricing without an overload of unnecessary information for the customer. Customer experience is where Shopify really excels, but sometimes it needs a helping hand.
The Customer Experience
The experience was now simple and streamlined: Pick the shape you need, enter your segment lengths, add any bends you might need within the parameters of your chosen shape (product). As each option is changed, you can see the total length and cost update in real time, so there are no surprises at the end of the shopping experience. The system picks the right variant automatically based on the tolerance range. Add to cart, or get immediate feedback if something’s outside of the limitations.
Customers didn’t need to understand the geometry or the manufacturing constraints. They just needed to know what they were trying to build, and the final cost. All the nitty gritty details were retained in line item details for the manufacturer via hidden inputs on the product page.
Shopify As A Team Member
If your products have complex rules that can’t be expressed as simple dropdown options, this pattern can make Shopify much more viable for your business than it might seem at first glance. With a competent and attentive agency to help you translate your internal business logic into custom code for your Shopify store, the platform goes from “just another Point of Sale to worry about”, to a self-regulating member of your team that expands your reach, reduces customer friction, and frees up valuable time for your company.
Does your business have products with complex rules that seem impossible to sell online?
Let’s talk about translating your internal logic into seamless customer experiences. Contact us to explore what’s possible.
