Event bridge rule to filter event for not empty array

Question

I have an EventBridge event in a pattern similar to below.

{
  "version": "0",
  "id": "816c9de5-517b-a18a-1190-e3e3c2f51f92",
  "detail-type": "ProductTableEvent",
  "source": "pi-data",
  "account": "751354400372",
  "time": "2022-07-07T05:58:26Z",
  "region": "eu-west-1",
  "resources": [],
  "detail": {
    "data": {
      "new": {
        "Gtin": "01234567",
        "NoIngredientsNeeded": 1,
        "DeliveryCostIncluded": 0,
        "MaximumOrder": 0,
        "ProductSegment": "Vardag",
        "StoreProducts": [],
      }
    }
  }
}

And I want to write an event pattern that get triggers when the storeProducts List is not empty.

As not empty is not same as checking for null, I cant use anything-but rule that checks for null. So none of the below rules works here.

  InsertProductRule:
    Type: 'AWS::Events::Rule'
    Properties:
      EventBusName: commerce
      EventPattern:
        source:
          - "my-source"
        detail
          data: 
            new:  
              StoreProducts:
                - exists: true
                - anything-but: []

Any idea how to do it?

Thank you very much!

Answer 1

You can use the following pattern:

{
  "source": ["pi-data"],
  "detail": {
    "data": {
      "new": {
        "StoreProducts": [{ "exists": true }]
      }
    }
  }
}

this will be triggered when StoreProducts is not an empty list.

---

When StoreProducts is an empty list:

When StoreProducts is not an empty list: