Bugfix/Chroma Metadata (#5552)

* update Chroma metadata handling with sanitization function

* Update packages/components/nodes/vectorstores/Chroma/core.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: HenryHengZJ

packages/components/nodes/vectorstores/Chroma/core.ts

@@ -5,6 +5,7 @@ import type {
     Collection,
     CollectionConfiguration,
     CollectionMetadata,
+    Metadata,
     Where
 } from 'chromadb'
 
@@ -145,7 +146,7 @@ export class Chroma extends VectorStore {
         const documentIds = options?.ids ?? Array.from({ length: vectors.length }, () => uuid.v1())
         const collection = await this.ensureCollection()
 
-        const mappedMetadatas = documents.map(({ metadata }) => {
+        const mappedMetadatas: Metadata[] = documents.map(({ metadata }) => {
             let locFrom
             let locTo
 
@@ -162,7 +163,7 @@ export class Chroma extends VectorStore {
 
             if (newMetadata.loc) delete newMetadata.loc
 
-            return newMetadata
+            return sanitizeMetadata(newMetadata)
         })
 
         await collection.upsert({
@@ -343,3 +344,27 @@ function ensureCollectionName(collectionName?: string) {
     }
     return collectionName
 }
+
+/**
+ * Sanitizes metadata to only include Chroma-compatible primitive values.
+ * Chroma metadata only supports boolean, number, string, and null values.
+ * Arrays and objects are JSON stringified to preserve the data.
+ */
+function sanitizeMetadata(metadata: Document['metadata']): Metadata {
+    const sanitized: Metadata = {}
+    for (const [key, value] of Object.entries(metadata)) {
+        if (value === null || typeof value === 'boolean' || typeof value === 'number' || typeof value === 'string') {
+            sanitized[key] = value
+        } else if (value !== undefined) {
+            try {
+                const stringified = JSON.stringify(value)
+                if (stringified !== undefined) {
+                    sanitized[key] = stringified
+                }
+            } catch {
+                // Skip values that cannot be stringified (e.g. circular references)
+            }
+        }
+    }
+    return sanitized
+}