Read objects

Instead of querying your database, you can use an ID to retrieve individual objects.

Additional information

Collection (class) Name in Object CRUD Operations

Collections act like namespaces, so two different collections could have duplicate IDs between them.

Prior to Weaviate v1.14 you can manipulate objects without specifying the collection name. This method is deprecated. It will be removed in Weaviate v2.0.0.

Starting in v1.20, you can have multi-tenant datasets. When multi-tenancy is enabled, the tenant name is required.

Always include the collection name, and, when enabled, the tenant name.

Get an object by id

Use an ID to retrieve an object. If the id doesn't exist, Weaviate returns a 404 error.

Python Client v4

jeopardy = client.collections.get("JeopardyQuestion")

data_object = jeopardy.query.fetch_object_by_id("00ff6900-e64f-5d94-90db-c8cfa3fc851b")

print(data_object.properties)

Python Client v3

data_object = client.data_object.get_by_id(
    "00ff6900-e64f-5d94-90db-c8cfa3fc851b",
    class_name="JeopardyQuestion",
)

print(json.dumps(data_object, indent=2))

JS/TS Client v3

const jeopardy = client.collections.get('JeopardyQuestion')

const response = await jeopardy.query.fetchObjectById('ed89d9e7-4c9d-4a6a-8d20-095cb0026f54')

console.log(response?.properties)

JS/TS Client v2

result = await client.data
  .getterById()
  .withClassName('JeopardyQuestion')
  .withId('00ff6900-e64f-5d94-90db-c8cfa3fc851b')
  .do();

console.log(JSON.stringify(result, null, 2));

Java

Result<List<WeaviateObject>> result = client.data().objectsGetter()
  .withClassName("JeopardyQuestion")
  .withID("00ff6900-e64f-5d94-90db-c8cfa3fc851b")
  .run();

System.out.println(result.getResult());

Go

objects, err := client.Data().ObjectsGetter().
  WithClassName("JeopardyQuestion").
  WithID("00ff6900-e64f-5d94-90db-c8cfa3fc851b").
  Do(ctx)
if err != nil {
  // handle error
  panic(err)
}

for i, obj := range objects {
  fmt.Printf("object[%v]: %+v\n", i, *obj)
}

Retrieve the object's vector

Object vectors can be retrieved by specifying its return.

Python Client v4

jeopardy = client.collections.get("JeopardyQuestion")

data_object = jeopardy.query.fetch_object_by_id(
    "00ff6900-e64f-5d94-90db-c8cfa3fc851b",
    include_vector=True
)

print(data_object.vector["default"])

Python Client v3

data_object = client.data_object.get_by_id(
    "00ff6900-e64f-5d94-90db-c8cfa3fc851b",
    class_name="JeopardyQuestion",
    with_vector=True
)

print(json.dumps(data_object, indent=2))

JS/TS Client v3

const jeopardy = client.collections.get('JeopardyQuestion')

const response = await jeopardy.query.fetchObjectById('ed89d9e7-4c9d-4a6a-8d20-095cb0026f54',{
  includeVector: true
})

console.log(response?.properties)

JS/TS Client v2

result = await client.data
  .getterById()
  .withClassName('JeopardyQuestion')
  .withId('00ff6900-e64f-5d94-90db-c8cfa3fc851b')
  .withVector()
  .do();

console.log(JSON.stringify(result, null, 2));

Java

Result<List<WeaviateObject>> result = client.data().objectsGetter()
  .withClassName("JeopardyQuestion")
  .withID("00ff6900-e64f-5d94-90db-c8cfa3fc851b")
  .withVector()
  // handle error
  .run();

System.out.println(result.getResult());

Go

objects, err := client.Data().ObjectsGetter().
  WithClassName("JeopardyQuestion").
  WithID("00ff6900-e64f-5d94-90db-c8cfa3fc851b").
  WithVector().
  Do(ctx)
if err != nil {
  // handle error
  panic(err)
}

for i, obj := range objects {
  fmt.Printf("object[%v]: %+v\n", i, *obj)
}

Retrieve named vectors

Where named vectors are used, you can retrieve one or more of them by specifying their names.

Python Client v4

reviews = client.collections.get("WineReviewNV")  # Collection with named vectors
vector_names = ["title", "review_body"]

data_object = reviews.query.fetch_object_by_id(
    uuid=obj_uuid,  # Object UUID
    include_vector=vector_names  # Specify names of the vectors to include
)

# The vectors are returned in the `vector` property as a dictionary
for n in vector_names:
    print(f"Vector '{n}': {data_object.vector[n][:5]}...")

Python Client v3

# Unfortunately, named vectors are not suppored in the v3 API / Python client.
# Please upgrade to the v4 API / Python client to use named vectors.

JS/TS Client v3

const reviews = client.collections.get('WineReviewNV') // Collection with named vectors
const objectUuid = '' // Object UUID

const response = await reviews.query.fetchObjectById(objectUuid,{
  includeVector: ['title', 'review_body']
})

console.log(response?.vectors.title)       // print the title vector
console.log(response?.vectors.review_body) // print the review_body vector

JS/TS Client v2

// Example coming soon

Check object existence

To efficiently check if an object with a given id exists without retrieving it, make a HEAD request to the /v1/objects/ REST endpoint, or use the following client code:

Python Client v4

# generate uuid based on the key properties used during data insert
object_uuid = generate_uuid5({"name": "Author to fetch"})

authors = client.collections.get("Author")
author_exists = authors.data.exists(object_uuid)

print("Author exist: ", author_exists)

Python Client v3

exists = client.data_object.exists(
  "36ddd591-2dee-4e7e-a3cc-eb86d30a4303",
  class_name="Author",
)
print(exists)

JS/TS Client v3

import { generateUuid5 } from 'weaviate-client';

// generate uuid based on the key properties used during data insert
const object_uuid = generateUuid5(
  JSON.stringify({ name: "Author to fetch"})
)

const authors = await client.collections.get('Author')
const authorExists = await authors.data.exists(object_uuid)

console.log('Author exists: ' + authorExists)

JS/TS Client v2

const response = await client.data
  .checker()
  .withClassName('Author')
  .withId('df48b9f6-ba48-470c-bf6a-57657cb07390')
  .do();
console.log(response);

Go

package main

import (
  "context"
  "fmt"

  "github.com/weaviate/weaviate-go-client/v4/weaviate"
  "github.com/weaviate/weaviate-go-client/v4/weaviate/data/replication"  // for consistency levels
)

func main() {
  cfg := weaviate.Config{
    Host:   "localhost:8080",
    Scheme: "http",
  }
  client, err := weaviate.NewClient(cfg)
  if err != nil {
    panic(err)
  }

  exists, err := client.Data().Checker().
    WithClassName("MyClass").
    WithID("36ddd591-2dee-4e7e-a3cc-eb86d30a0923").
    WithConsistencyLevel(replication.ConsistencyLevel.ONE).  // default QUORUM
    Do(context.Background())

  if err != nil {
    panic(err)
  }
  fmt.Printf("%v", exists)
}

// The parameter passed to "WithConsistencyLevel" can be one of:
// * replication.ConsistencyLevel.ALL,
// * replication.ConsistencyLevel.QUORUM, or
// * replication.ConsistencyLevel.ONE.
//
// It determines how many replicas must acknowledge a request
// before it is considered successful.

Java

package io.weaviate;

import io.weaviate.client.Config;
import io.weaviate.client.WeaviateClient;
import io.weaviate.client.base.Result;
import io.weaviate.client.v1.data.replication.model.ConsistencyLevel;

public class App {
  public static void main(String[] args) {
    Config config = new Config("http", "localhost:8080");
    WeaviateClient client = new WeaviateClient(config);

    Result<Boolean> result = client.data().checker()
      .withClassName("MyClass")
      .withID("36ddd591-2dee-4e7e-a3cc-eb86d30a4303")
      .withConsistencyLevel(ConsistencyLevel.ONE)  // default QUORUM
      .run();

    if (result.hasErrors()) {
      System.out.println(result.getError());
      return;
    }
    System.out.println(result.getResult());
  }
}

// The parameter passed to `withConsistencyLevel` can be one of:
// * ConsistencyLevel.ALL,
// * ConsistencyLevel.QUORUM, or
// * ConsistencyLevel.ONE.
//
// It determines how many replicas must acknowledge a request
// before it is considered successful.

Related pages

• Connect to Weaviate
• How-to: Search
• How-to: Read all objects
• References: REST - /v1/objects

Questions and feedback

If you have any questions or feedback, let us know in the user forum.

• Technical questions
• Documentation feedback