Mechanic
đŸ“Ŗ Shopify REST Deprecation
  • â›Šī¸Introduction
  • 🤓Hire a Mechanic developer
  • đŸ’¯status.mechanic.dev
  • đŸ“ŖShopify is deprecating the REST API
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  • 🧑‍đŸ’ģ"I need help with my custom task!"
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  • Resources
    • âŦ‡ī¸Install Mechanic
    • 🧑‍đŸ’ģTask library
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        • Auto-tag orders by originating staff member
        • Maintain a tag for orders processed today
        • Auto-tag orders with their tracking numbers
        • Sync inventory for shared SKUs
        • Auto-tag products when their SKU(s) change
        • Auto-publish new products
        • Email a report of customers who haven't ordered in X days
        • Upgrading a Mechanic task: Adding a time delay
        • Email the customer when tracking numbers are added to their order
        • Adding an optional time delay to your Mechanic task
        • Delete all orders
        • Send an email when a specific product is shipped
        • Send recurring reminders about unpaid orders
        • Send an email when a product's price goes below its cost
        • Auto-tag customers by sales channel
        • Creating products in bulk
      • Creating a Mechanic webhook
      • Practicing writing tasks
      • Triggering tasks from a contact form
      • Creating scheduled CSV feeds
      • Fetching data from a shared Google sheet
    • 🏆Converting tasks from Shopify REST to GraphQL
      • Conversion: Single resource lookups
      • Conversion: Resource loops to paginated queries
      • Conversion: Connections from a resource
      • Conversion: Metafield lookups from a resource
      • Conversion: Resource lookups in task option fields
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    • Interacting with Shopify
      • Responding to events
        • Reconciling missing events
      • Reading data
        • âš ī¸Liquid objects
        • 🏆GraphQL in Liquid
        • Bulk operations
        • The Shopify action
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      • Shopify admin action links
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    • 🔆Policies
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      • Mechanic objects
        • Action object
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        • âš ī¸Shopify REST Admin API
          • đŸšĢArticle object
          • đŸšĢBlog object
          • đŸšĢCollection object
          • đŸšĢCustomer object
          • đŸšĢDiscount code object
          • đŸšĢDispute object
          • đŸšĢDraft order object
          • đŸšĢFulfillment object
          • đŸšĢFulfillment order object
          • đŸšĢFulfillment event object
          • đŸšĢGift card object
          • đŸšĢInventory item object
          • đŸšĢInventory level object
          • đŸšĢLine item object
          • đŸšĢLocation object
          • đŸšĢMetafields
            • Metafield object
            • Metafield representation object
            • Metafield collection object
          • đŸšĢOrder object
          • đŸšĢOrder risk object
          • đŸšĢPrice rule object
          • đŸšĢProduct object
          • đŸšĢProduct image object
          • đŸšĢRefund object
          • đŸšĢShipping zone object
          • đŸšĢShop object
          • đŸšĢTheme object
          • đŸšĢTheme asset object
          • đŸšĢTransaction object
          • đŸšĢVariant object
      • Mechanic tags
        • liquid
        • action
        • assign
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      • Mechanic code snippets
    • Shopify
      • Custom authentication
      • "Read all orders"
    • Webhooks
  • Techniques
    • Preventing action loops
    • Writing a high-quality task
    • Tagging Shopify resources
    • Debouncing events
    • Responding to action results
    • Working with external APIs
      • JSON Web Signatures
      • AWS request signatures
    • Finding a resource ID
    • Migrating templates from Shopify to Mechanic
    • Securing Mechanic webhooks
    • Monitoring Mechanic
  • FAQ
    • The app isn't loading. What do I do?
    • How do I stop a large batch of runs?
    • A Shopify event is missing. Where is it?
    • Does Mechanic have an affiliate program?
    • Can non-owners install Mechanic?
    • Can I replace Shopify's order emails with Mechanic?
    • Can I manually set Shopify permissions for Mechanic?
    • Does my theme need to be updated for Mechanic?
    • Do you have a plan for development stores?
    • Why don't I see any events in my task's activity?
    • Can I read data back from my webhook submission?
    • My task added a tag, but now the tag is missing – why?
    • How do I add an unsubscribe link to my emails?
    • How do I send images with my emails?
    • Can I re-send order confirmation emails with Mechanic?
    • Why am I seeing a different price than on the app store?
    • Do you have a Partner-friendly plan?
    • Why are my tasks delayed or not running?
    • My task is failing because of a permissions problem. Why?
    • How do I preview email attachments?
    • Can I query external APIs?
    • Why can't I access the Shopify API during preview mode?
    • How do marketing preferences work with Mechanic?
    • Can I send data to Google Sheets?
    • What's possible with timeline comments?
    • I'm getting a "query param length is too long" error when using GraphQL.
    • Can my Mechanic concurrency limit be raised?
    • What IP address does Mechanic use?
    • Can Mechanic read or manage customer subscriptions?
    • Why is everything harder now?
    • Can task content be translated into multiple languages?
    • Can I add a time delay to my task?
    • Can I add another store to my existing Mechanic subscription?
    • How can I reduce memory usage of my task?
    • How do I connect PayPal to Shopify with Mechanic?
    • How do I add a Shopify access scope to my task?
    • Can I have my Mechanic data retained for more (or less) than 15 days?
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  • đŸ“Ŗ Shopify REST Deprecation
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  • Inspecting the context
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  1. Techniques

Responding to action results

PreviousDebouncing eventsNextWorking with external APIs

Last updated 1 year ago

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Action runs are performed asynchronously, . This means their results aren't available to the Liquid task code that defined them.

To respond to action results, add a task subscription to the mechanic/actions/perform event topic. When a task includes this subscription, Mechanic will generate an event with that topic for every action that the task completes. This event will only ever be responded to by the task that generated it; it will never be sent to other tasks.

Common use cases:

  • Evaluating response codes or payloads

    • See

  • Evaluating the results of GraphQL mutations

  • Using content from generated

The does not generate mechanic/actions/perform events.

Inspecting the context

Events with the topic mechanic/actions/perform are, by nature, always . As such, their event variable contains a reference to the event's parent. This means a task may use event.parent.data to access all the data that informed the construction of the action in question. (Note that only the previous 5 generations of parents are available.)

A mechanic/actions/perform event also provides task runs with an action variable (containing the same information available in event.data). This variable contains the original (including its type, options, and meta information), and data from the run in which the action was performed.

Common sources of information for followup task runs:

  • action.options — the original options defined for the action

  • action.run.ok — true or false, indicating the action's success

  • action.run.result — the value (if any) generated by the action run

  • action.run.error — the error (if any) raised during the action run

  • action.meta — the given in the action's definition

It's important to specifically account for the mechanic/actions/perform topic when writing a task script, minding the fact that improper composition could result in an infinite loop.

Mechanic will step in and forcibly fail subsequent task runs that contain results identical to their predecessors.

Example

mechanic/user/trigger
mechanic/actions/perform
{% if action.run.ok == false %}
  {% action "email" %}
    {
      "to": "admin@example.com",
      "subject": "Action failure",
      "body": {{ "Alert!<br><br>" | append: action.run.error | json }}
    }
  {% endaction %}
{% elsif event.topic contains "trigger" %}
  {% action %}
    {
      "type": "cache",
      "options": ["set", "foo", "bar"],
      "meta": {
        "mode": "first"
      }
    }
  {% endaction %}
{% elsif action.meta.mode == "first" %}
  {% capture mutation %}
    mutation {
      tagsAdd(id: "gid://shopify/Customer/1234567890", tags: ["processed"]) {
        userErrors { field, message }
      }
    }
  {% endcapture %}

  {% action %}
    {
      "type": "shopify",
      "options": {{ mutation | json }},
      "meta": {
        "mode": "second"
      }
    }
  {% endaction %}
{% elsif action.meta.mode == "second" %}
  {% action "echo", "done" %}
{% endif %}

This example cycles between three different modes of operation, depending on the recorded in the action definition. And, by checking on action.run.ok at the very beginning, the task is also able to "break" into failure-handling mode, in which an email is sent to an administrator.

like all Mechanic runs
HTTP
Working with external APIs
Shopify
Files
Echo action
child events
action object
meta information
meta information