DA-831: Update LangChain to use CouchbaseSearchVectorStore#8
DA-831: Update LangChain to use CouchbaseSearchVectorStore#8ejscribner wants to merge 2 commits intomainfrom
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…r handling and cleanup
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Summary of ChangesHello @ejscribner, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request primarily focuses on modernizing the application's integration with LangChain and Couchbase, specifically by migrating to the recommended Highlights
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Code Review
This pull request successfully updates the application to use CouchbaseSearchVectorStore instead of the deprecated CouchbaseVectorStore, and introduces several other valuable improvements such as better error handling and frontend performance optimizations with React Suspense. My review highlights a few areas for improvement: a piece of debugging code that alters functionality should be reverted, error responses could be more specific by including HTTP status codes, and there's an opportunity to correct a function's return type which would also allow for the removal of some redundant code.
app/api/chat/route.ts
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| // Skip history-aware retriever for now to debug the issue | ||
| const conversationalRetrievalChain = await createRetrievalChain({ | ||
| retriever: historyAwareRetrieverChain, | ||
| retriever: retriever, | ||
| combineDocsChain: documentChain, | ||
| }); |
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The history-aware retriever has been disabled, with a comment indicating this is for debugging. This is a significant functional change as the chat will no longer consider conversation history when retrieving documents. If this is a temporary measure, it should be reverted before merging. If the change is intentional, it should be clearly documented in the pull request description.
const conversationalRetrievalChain = await createRetrievalChain({
retriever: historyAwareRetrieverChain,
combineDocsChain: documentChain,
});| import { connect, Cluster } from "couchbase"; | ||
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| export async function createCouchbaseCluster(): Promise<Cluster> { | ||
| export async function createCouchbaseCluster(): Promise<Cluster | void> { |
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The function's return type is declared as Promise<Cluster | void>, but it never resolves to void. It either returns a Promise<Cluster> on a successful connection or throws an error (resulting in a rejected promise). The return type should be Promise<Cluster> to accurately reflect the function's behavior.
| export async function createCouchbaseCluster(): Promise<Cluster | void> { | |
| export async function createCouchbaseCluster(): Promise<Cluster> { |
| if (!cluster) { | ||
| throw new Error("Couchbase cluster connection failed"); | ||
| } |
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This check for !cluster is redundant. The createCouchbaseCluster function is designed to throw an error if the connection fails, which will be caught by the outer try...catch block in this POST handler. As a result, this if block is unreachable and can be safely removed.
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| } catch (err) { | ||
| console.log("Error Received ", err); | ||
| return NextResponse.json({ error: "Failed to process chat message" }); |
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It's good practice to include an HTTP status code with error responses. For a server-side failure like this, returning a 500 Internal Server Error status is more informative for clients and monitoring tools.
return NextResponse.json({ error: "Failed to process chat message" }, { status: 500 });| if (!cluster) { | ||
| throw new Error("Couchbase cluster connection failed"); | ||
| } |
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This check for !cluster is redundant. The createCouchbaseCluster function will throw an error if the connection fails, and this error will be caught by the try...catch block in this POST handler. Therefore, this if block is unreachable and can be removed.
1 participant
After deprecating
CouchbaseVectorStorein favor ofCouchbaseSearchVectorStoreandCouchbaseQueryVectorStore, we need to update all dependents that useCouchbaseVectorStoreto useCouchbaseSearchVectorStore. Ref: https://jira.issues.couchbase.com/browse/DA-831This PR includes several other usability improvements as well.