Weather-Dependent Pricing

Add a Pricing Module

Create a custom pricing adapter that adjusts prices based on weather conditions. This demonstrates how to extend Unchained's pricing system with external APIs.

import { ProductPricingDirector, ProductPricingAdapter } from "meteor/unchained:core-pricing";
import fetch from "isomorphic-unfetch";
            
const PRODUCT_TAG_SAUSAGE = "sausage";
const SAUSAGE_THRESHOLD_CELSIUS = 20;

class WeatherDependentBarbequeSausagePricing extends ProductPricingAdapter {
  static key = "shop.unchained.wd-bbq-sausage-pricing";
  static version = "1.0";
  static label = "Calculate the price of a sausage 🌭🌦";
  static orderIndex = 3;

  static isActivatedFor({product}) {
    if (
      product.tags &&
      product.tags.length > 0 &&
      product.tags.indexOf(PRODUCT_TAG_SAUSAGE) !== -1
    ) {
      return true;
    }
    return false;
  }

  async calculate() {
    const { currency, quantity } = this.context;
    try {
      const response = await fetch(
        "https://community-open-weather-map.p.rapidapi.com/weather?q=zurich,ch&units=metric", 
        {
          headers: {
            "x-rapidapi-key": "2a849e288dmsh59370f28a9102f6p1c881cjsn28010ce8ff58",
            "x-rapidapi-host": "community-open-weather-map.p.rapidapi.com",
            "useQueryString": true
          }
        }
      );
      if (response.status === 200) {
        const { main } = await response.json();
        const { temp} = main;
        if (temp) {
          if (temp > SAUSAGE_THRESHOLD_CELSIUS) {
            console.log("🌭 -> High season, sausage pricy!!"); 
            this.result.addItem({
              currency,
              amount: 100 * quantity,
              isTaxable: true,
              isNetPrice: true,
              meta: { adapter: this.constructor.key }
            });
          }
        }
      }
    } catch (e) {
      console.error('🌭 -> Failed while trying to price weather dependent');
    }

    return super.calculate();
  }
}

ProductPricingDirector.registerAdapter(WeatherDependentBarbequeSausagePricing);

Craft the Query

query getProduct {
  product(slug: "🌭") {
    _id
    texts {
      title
    }
    ... on SimpleProduct {
      catalogPrice {
        price {
          amount
          currency
        }
      }
    }
  }
}