Update data

This page shows you how to update documents in a collection. The REST request accepts an optional branch field. Omitting it writes to the default branch, main; a tag or alias is not a valid write target.

If the collection contains managed embedding vector fields, update the configured source text fields instead of sending direct vector values for managed embedding fields.

from lambdadb import LambdaDB

with LambdaDB(
    project_api_key="YOUR_API_KEY",
    base_url="YOUR_BASE_URL",
    project_name="YOUR_PROJECT_NAME",
) as client:
    coll = client.collection("my_collection")
    docs = [
        {"id": "33201222", "title": "LambdaDB", "text": "LambdaDB is the vector lake for AI memory ... "},
        {"id": "33201223", "url": "https://en.wikipedia.org/wiki/Winamp", "title": "Winamp v2", "text": "Winamp v2 is a media player for Windows, macOS and Android, originally developed by Nullsoft."},
    ]
    coll.docs.update(docs=docs)

Python: LambdaDB supports context manager usage. __enter__ returns the client, and __exit__ calls client.close() (closing the SDK-owned HTTP client) and makes the client unusable after the with block. If you don’t use with, call client.close() when you’re done. If you pass a custom client=/async_client=, you own closing it.

import { LambdaDBClient } from "@functional-systems/lambdadb";

const client = new LambdaDBClient({
  projectApiKey: "YOUR_API_KEY",
  baseUrl: "YOUR_BASE_URL",
  projectName: "YOUR_PROJECT_NAME",
});
await client.collection("my_collection").docs.update({
  docs: [
    { id: "33201222", title: "LambdaDB", text: "LambdaDB is the vector lake for AI memory ... " },
    { id: "33201223", url: "https://en.wikipedia.org/wiki/Winamp", title: "Winamp v2", text: "Winamp v2 is a media player for Windows, macOS and Android." },
  ],
});

package main

import (
  "context"
  "log"
  lambdadb "github.com/lambdadb/go-lambdadb"
)

func main() {
  ctx := context.Background()
  client := lambdadb.New(
    lambdadb.WithBaseURL("YOUR_BASE_URL"),
    lambdadb.WithProjectName("YOUR_PROJECT_NAME"),
    lambdadb.WithAPIKey("YOUR_API_KEY"),
  )
  docs := []map[string]interface{}{
    {"id": "33201222", "title": "LambdaDB", "text": "LambdaDB is the vector lake for AI memory ... "},
    {"id": "33201223", "title": "Winamp v2", "text": "Winamp v2 is a media player for Windows, macOS and Android."},
  }
  _, err := client.Collection("my_collection").Docs().Update(ctx, lambdadb.UpdateDocsInput{Docs: docs})
  if err != nil {
    log.Fatal(err)
  }
}

LAMBDADB_PROJECT_API_KEY="YOUR_API_KEY"

curl -X POST \
  "$BASE_URL/projects/$PROJECT_NAME/collections/{collectionName}/docs/update" \
  -H 'content-type: application/json' \
  -H "x-api-key: $LAMBDADB_PROJECT_API_KEY" \
  -d '{
    "branch": "candidate",
    "docs": [
      {
        "id": "33201222",
        "title": "LambdaDB",
        "text": "LambdaDB is the vector lake for AI memory ... "
      },
      {
        "id": "33201223",
        "url": "https://en.wikipedia.org/wiki/Winamp",
        "title": "Winamp v2",
        "text": "Winamp v2 is a media player for Windows, macOS and Android, originally developed by Justin Frankel and Dmitry Boldyrev by their company Nullsoft, which they later sold to AOL, who sold to Radionomy in January 2014."
      }
    ]
  }'

The cURL example writes to the candidate branch. Remove branch to write to main.

Each document in a payload must contain an id field to uniquely identify a document to update. For a partitioned collection, a document in the __default__ partition with a matching id value is updated if the partition field is not provided.

Update limits

Metric	Limit
Max payload size	6MB
Max length for a document ID	512 characters
Max vector dimensions	4,096
Max document size	5MB

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