Does the Composite API Support Chatter Feed Elements?

Question:

Is there official documentation that lists the REST API resources supported by the Composite API? I attempted to use the Composite API with a request body that included two operations: a PATCH request to update a Case record and a POST request to create a new Chatter feed element. However, when including the Chatter feed element API (/services/data/v59.0/chatter/feed-elements), I received an error indicating that the resource does not exist, even though the request works fine when fired separately.

Here is the request body I used:

POST_URL: {{_endpoint}}/services/data/v59.0/composite

{
    "allOrNone": true,
    "compositeRequest": [
        {
            "method": "PATCH",
            "url": "/services/data/v59.0/sobjects/Case/500al00000Ht0vH",
            "referenceId": "caseUpdate",
            "body": {
                "Status": "Working"
            }
        },
        {
            "method": "POST",
            "url": "/services/data/v59.0/chatter/feed-elements",
            "referenceId": "newFeedElement",
            "body": {
                "body": {
                    "messageSegments": [
                        {
                            "type": "Text",
                            "text": "When should we meet for planning?"
                        }
                    ]
                },
                "feedElementType": "FeedItem",
                "subjectId": "500al00000Ht0vH" // Your valid Case ID
            }
        }
    ]
}

I got the following response:

{
    "compositeResponse": [
        {
            "body": [
                {
                    "errorCode": "PROCESSING_HALTED",
                    "message": "The transaction was rolled back since another operation in the same transaction failed."
                }
            ],
            "httpHeaders": {},
            "httpStatusCode": 400,
            "referenceId": "caseUpdate"
        },
        {
            "body": [
                {
                    "errorCode": "NOT_FOUND",
                    "message": "The requested resource does not exist"
                }
            ],
            "httpHeaders": {},
            "httpStatusCode": 404,
            "referenceId": "newFeedElement"
        }
    ]
}

If I try to fire /services/data/v59.0/chatter/feed-elements separately, it works fine and adds Chatter posts to the Case.

Answer:

The Composite API in Salesforce does not support all REST resources. According to the official documentation, it is designed to work with specific resources only.

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the Composite API is supported for the following resources:

1. All sObject resources (/services/data/vXX.X/sobjects/), such as creating, updating, or deleting sObjects, including handling rows by External ID. However, sObject Blob Get operations are excluded from Composite API support.
   
2. The Query resource (/services/data/vXX.X/query/?q=soql), which allows for executing SOQL queries.
   
3. The QueryAll resource (/services/data/vXX.X/queryAll/?q=soql), which includes querying for all records, including soft-deleted records.
   
4. The sObject Collections resource (/services/data/vXX.X/composite/sobjects), available from API version 43.0 onward, which allows bulk operations on sObjects.

However, the Chatter feed elements API (/services/data/v59.0/chatter/feed-elements) is not supported by the Composite API. This is because Chatter feed elements are not included in the list of resources that can be processed as part of a composite request.

When you attempt to include the Chatter feed element API in the composite request, it results in the error “The requested resource does not exist”, because the resource is not compatible with the Composite API. To successfully post Chatter feed elements, you must call the Chatter API separately, outside of the composite request.

Conclusion:

While the Composite API is a powerful tool for performing multiple operations in a single request, it has specific limitations regarding the supported resources. Chatter feed elements and certain other APIs are not supported, so they must be handled in separate requests. It’s crucial to check the official documentation to verify which resources are compatible with the Composite API when designing your integrations.

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