Auto-price products based on their compare-at prices, with Mechanic.

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Auto-price products based on their compare-at prices

Use this task when the pricing for your products can be automatically calculated by multiplying with compare-at prices.

Runs Occurs when a user manually triggers the task. Configuration includes multiplier when calculating price, required product tag, run automatically for product updates, run daily, and test mode.

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Documentation

Use this task when the pricing for your products can be automatically calculated by multiplying with compare-at prices.

Run this task manually to process your entire product catalog, optionally filtering by product tag. Or, choose to have this task run whenever products are updated, or run daily, at midnight in your store's local timezone.

Developer details

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That’s why we make it easy to configure automation without code, why we make it easy to tweak the underlying code once tasks are installed, and why we publish it all here for everyone to learn from.

(By the way, have you seen our documentation? Have you joined the Slack community?)

Open source
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Subscriptions
{% if options.run_automatically_for_product_updates__boolean %}
  shopify/products/update
{% endif %}

{% if options.run_daily__boolean %}
  mechanic/scheduler/daily
{% endif %}

mechanic/user/trigger
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Options
multiplier when calculating price (number, required), required product tag, run automatically for product updates (boolean), run daily (boolean), test mode (boolean)
Code
{% comment %}
  Preferred option order:

  {{ options.multiplier_when_calculating_price__number_required }}
  {{ options.required_product_tag }}
  {{ options.run_automatically_for_product_updates__boolean }}
  {{ options.run_daily__boolean }}
  {{ options.test_mode__boolean }}
{% endcomment %}

{% if options.multiplier_when_calculating_price__number_required < 0 %}
  {% error "Price multiplier must be at least 0. :)" %}
{% endif %}

{% if event.topic contains "shopify/products/" %}
  {% if event.preview %}
    {% capture product_json %}
      {
        "tags": {{ options.required_product_tag | json }},
        "variants": [
          {
            "id": 1234567890,
            "admin_graphql_api_id": "gid://shopify/ProductVariant/1234567890",
            "sku": "ABC123",
            "price": "999.00",
            "compare_at_price": "10.00"
          }
        ]
      }
    {% endcapture %}

    {% assign product = product_json | parse_json %}
  {% endif %}

  {% assign product_tags = product.tags | split: ", " %}
  {% if options.required_product_tag == blank or product_tags contains options.required_product_tag %}
    {% assign summaries = array %}
    {% assign mutations = array %}

    {% for variant in product.variants %}
      {% if variant.compare_at_price == blank %}
        {% continue %}
      {% endif %}

      {% assign compare_at_price = variant.compare_at_price | times: 1 %}
      {% assign price = variant.price | times: 1 %}
      {% assign desired_price = compare_at_price | times: options.multiplier_when_calculating_price__number_required %}

      {% if desired_price != price %}
        {% if options.test_mode__boolean %}
          {% assign summary = hash %}
          {% assign summary["id"] = variant.id %}
          {% assign summary["sku"] = variant.sku %}
          {% assign summary["compare_at_price"] = compare_at_price %}
          {% assign summary["current_price"] = price %}
          {% assign summary["desired_price"] = desired_price %}
          {% assign summaries[summaries.size] = summary %}
        {% else %}
          {% capture mutation %}
            productVariantUpdate{{ forloop.index }}: productVariantUpdate(
              input: {
                id: {{ variant.admin_graphql_api_id | json }}
                price: {{ desired_price | append: "" | json }}
              }
            ) {
              productVariant {
                price
                compareAtPrice
              }
              userErrors {
                field
                message
              }
            }
          {% endcapture %}

          {% assign mutations[mutations.size] = mutation %}
        {% endif %}
      {% endif %}
    {% endfor %}

    {% if options.test_mode__boolean %}
      {% if summaries != empty %}
        {% action "echo" summaries %}
      {% endif %}
    {% elsif mutations != empty %}
      {% action "shopify" %}
        mutation {
          {{ mutations | join: newline }}
        }
      {% endaction %}
    {% endif %}
  {% endif %}
{% elsif event.topic == "mechanic/user/trigger" or event.topic contains "mechanic/scheduler/" %}
  {% assign cursor = nil %}

  {% assign productVariants_query = nil %}
  {% if options.required_product_tag != blank %}
    {% assign productVariants_query = options.required_product_tag | json | prepend: "tag:" %}
  {% endif %}

  {% for n in (0..100) %}
    {% capture query %}
      query {
        productVariants(
          first: 250
          after: {{ cursor | json }}
          query: {{ productVariants_query | json }}
        ) {
          pageInfo {
            hasNextPage
          }
          edges {
            cursor
            node {
              id
              displayName
              price
              compareAtPrice
            }
          }
        }
      }
    {% endcapture %}

    {% assign result = query | shopify %}

    {% if event.preview %}
      {% capture result_json %}
        {
          "data": {
            "productVariants": {
              "edges": [
                {
                  "node": {
                    "id": "gid://shopify/ProductVariant/1234567890",
                    "displayName": "IPod Nano - 8GB",
                    "price": "999.00",
                    "compareAtPrice": "10.00"
                  }
                }
              ]
            }
          }
        }
      {% endcapture %}

      {% assign result = result_json | parse_json %}
    {% endif %}

    {% for productVariant_edge in result.data.productVariants.edges %}
      {% assign productVariant = productVariant_edge.node %}

      {% if productVariant.compareAtPrice == blank %}
        {% continue %}
      {% endif %}

      {% assign compare_at_price = productVariant.compareAtPrice | times: 1 %}
      {% assign price = productVariant.price | times: 1 %}
      {% assign desired_price = compare_at_price | times: options.multiplier_when_calculating_price__number_required %}

      {% if desired_price != price %}
        {% if options.test_mode__boolean %}
          {% action "echo" name: productVariant.displayName, compare_at_price: compare_at_price, current_price: price, desired_price: desired_price %}
        {% else %}
          {% action "shopify" %}
            mutation {
              productVariantUpdate(
                input: {
                  id: {{ productVariant.id | json }}
                  price: {{ desired_price | append: "" | json }}
                }
              ) {
                productVariant {
                  price
                  compareAtPrice
                }
                userErrors {
                  field
                  message
                }
              }
            }
          {% endaction %}
        {% endif %}
      {% endif %}
    {% endfor %}

    {% if result.data.productVariants.pageInfo.hasNextPage %}
      {% assign cursor = result.data.productVariants.edges.last.cursor %}
    {% else %}
      {% break %}
    {% endif %}
  {% endfor %}
{% endif %}
Task code is written in Mechanic Liquid, an extension of open-source Liquid enhanced for automation. Learn more
Defaults
Multiplier when calculating price
0.8
Test mode
true