---
title: "logFeedbackAttachment(sentiment:issues:desiredOutput:)"
framework: foundationmodels
role: symbol
role_heading: Instance Method
path: "foundationmodels/languagemodelsession/logfeedbackattachment(sentiment:issues:desiredoutput:)"
---

# logFeedbackAttachment(sentiment:issues:desiredOutput:)

Logs and serializes a feedback attachment that can be submitted to Apple.

## Declaration

```swift
@discardableResult final func logFeedbackAttachment(sentiment: LanguageModelFeedback.Sentiment?, issues: [LanguageModelFeedback.Issue] = [], desiredOutput: Transcript.Entry? = nil) -> Data
```

## Parameters

- `sentiment`: An optional sentiment rating about the model’s output (positive, negative, or neutral).
- `issues`: An array of specific issues identified with the model’s response. Defaults to an empty array.
- `desiredOutput`: An optional transcript entry showing what the desired output should have been.

## Mentioned in

Prompting an on-device foundation model

## Return Value

Return Value A Data object containing the JSON-encoded feedback attachment that can be submitted to Feedback Assistant.

## Discussion

Discussion This method creates a structured feedback attachment containing the session’s transcript and any provided feedback information. The attachment can be saved to a file and submitted to Apple using Feedback Assistant. If an error occurred during a previous response, any rejected entries that were rolled back from the transcript are included in the feedback data. let session = LanguageModelSession() let response = try await session.respond(to: "What is the capital of France?")

// Create feedback for a helpful response let feedbackData = session.logFeedbackAttachment(sentiment: .positive)

// Or create feedback for a problematic response let feedbackData = session.logFeedbackAttachment(     sentiment: .negative,     issues: [         LanguageModelFeedback.Issue(             category: .incorrect,             explanation: "The model provided outdated information"         )     ],     desiredOutput: Transcript.Entry.response(...) ) If your desiredOutput is a string, use Transcript.Entry.response(_:) to turn your desired output into a Transcript entry: let text = Transcript.TextSegment(content: "The capital of France is Paris.") let segment = Transcript.Segment.text(text) let response = Transcript.Response(segments: [segment]) let entry = Transcript.Entry.response(response) If your desiredOutput is a Generable type, turning that into a Transcript entry is slightly different: let customType = MyCustomType(...) // A generable type. let structure = Transcript.StructuredSegment(schemaName: String(describing: Foo.self), content: customType.generatedContent) let segment = Transcript.Segment.structure(structure) let response = Transcript.Response(segments: [segment]) let entry = Transcript.Entry.response(response) Finally, if you’d like to submit the feedback to Apple, write your feedback to a .json file and include the file as an attachment to Feedback Assistant. You can include one or many feedback attachment in the same file: let allFeedback = feedbackData + feedbackData2 + feedbackData3 let url = URL(fileURLWithPath: "path/to/save/feedback.json") try allFeedback.write(to: url)

## See Also

### Generating feedback

- [logFeedbackAttachment(sentiment:issues:desiredResponseContent:)](foundationmodels/languagemodelsession/logfeedbackattachment(sentiment:issues:desiredresponsecontent:).md)
- [logFeedbackAttachment(sentiment:issues:desiredResponseText:)](foundationmodels/languagemodelsession/logfeedbackattachment(sentiment:issues:desiredresponsetext:).md)
- [LanguageModelFeedback](foundationmodels/languagemodelfeedback.md)