script.liquid

{% comment %}
  Run the task manually to get the list of your publications and their IDs
{% endcomment %}

{% if event.topic == "mechanic/user/trigger" or event.preview %}
  {% capture query %}
    query {
      publications (first: 30 ) {
        nodes {
          name
          id
        }
      }
    } 
  {% endcapture %}

  {% assign result = query | shopify %}

  {% action "echo" result %}
{% endif %}

{% if event.topic == "shopify/inventory_levels/update" or event.preview %}
  {% capture query %}
    query {
      inventoryLevel(id: {{ inventory_level.admin_graphql_api_id | json }}) {
        item {
          variant {
            displayName
            inventoryQuantity
            legacyResourceId
            product {
              legacyResourceId
              {% if options.must_belong_to_collection_id -%}
                inCollection(id: "gid://shopify/Collection/{{options.must_belong_to_collection_id}}")
              {%- endif %}
              {% if options.must_be_published_to_publication_id -%}
                publishedOnPublication(publicationId: "gid://shopify/Publication/{{options.must_be_published_to_publication_id}}")
              {%- endif %}
            }
          }
        }
      }
    }
  {% endcapture %}

  {% assign result = query | shopify %}

  {% if event.preview %}
    {% capture result_json %}
      {
        "data": {
          "inventoryLevel": {
            "item": {
              "variant": {
                "displayName": "Short sleeve t-shirt - L / Red",
                "inventoryQuantity": 0,
                "legacyResourceId": "1234567890",
                "product": {
                  "legacyResourceId": "1234567890"
                  {% if options.must_belong_to_collection_id -%}
                    , "inCollection" : "true"
                  {%- endif %}
                  {% if options.must_be_published_to_publication_id -%}
                    , "publishedOnPublication": "true"
                  {%- endif %}                
                }
              }
            }
          }
        }
      }
    {% endcapture %}

    {% assign result = result_json | parse_json %}
    {% action "echo" result %}
  {% endif %}

  {% assign product_qualifies = false %}

  {% assign variantNode = result.data.inventoryLevel.item.variant %}

  {% if options.must_belong_to_collection_id != blank and options.must_be_published_to_publication_id != blank  %}
    {% error "You can only filter by collection or publication, not both." %}
  {% endif %}

  {% if options.must_belong_to_collection_id == blank and options.must_be_published_to_publication_id == bank %}
    {% assign product_qualifies = true %}
  {% elsif options.must_belong_to_collection_id and variantNode.product.inCollection %}
    {% assign product_qualifies = true %}
  {% elsif options.must_be_published_to_publication_id and variantNode.product.publishedOnPublication %}
    {% assign product_qualifies = true %}
  {% endif %}
  
  {% if variantNode.inventoryQuantity == 0 and product_qualifies %}
    {% assign variant_admin_url = "https://" | append: shop.domain | append: "/admin/products/" | append: variantNode.product.legacyResourceId | append: "/variants/" | append: variantNode.legacyResourceId %}

    {% assign subject = options.email_subject__required     | replace: "VARIANT_TITLE", variantNode.displayName | replace: "VARIANT_ADMIN_URL", variant_admin_url %}
    {% assign body = options.email_body__multiline_required | replace: "VARIANT_TITLE", variantNode.displayName | replace: "VARIANT_ADMIN_URL", variant_admin_url %}

    {% action "email" %}
      {
        "to": {{ options.email_recipient__email_required | json }},
        "subject": {{ subject | json }},
        "body": {{ body | strip | newline_to_br | json }},
        "reply_to": {{ shop.customer_email | json }},
        "from_display_name": {{ shop.name | json }}
      }
    {% endaction %}
  {% endif %}  
{% endif %}