const relationships = [
  {
     externalId: 'some_relationship',
     sourceExternalId: 'some_source_external_id',
     sourceType: 'asset' as const,
     targetExternalId: 'some_target_external_id',
     targetType: 'event' as const
  }
];
const createdRelationships = await client.relationships.create(relationships);

from cognite.client.data_classes import Relationship
flowrel1 = Relationship(
    external_id="flow_1",
    source_external_id="source_ext_id",
    source_type="asset",
    target_external_id="target_ext_id",
    target_type="event",
    confidence=0.1,
    data_set_id=1234
)
flowrel2 = Relationship(
    external_id="flow_2",
    source_external_id="source_ext_id",
    source_type="asset",
    target_external_id="target_ext_id",
    target_type="event",
    confidence=0.1,
    data_set_id=1234
)
res = client.relationships.create([flowrel1,flowrel2])

List<Asset> assetUpsertList = //list of Asset; 
List<Event> eventUpsertList = //list of Event; 
List<TimeseriesMetadata> timseriesUpsertList = //list of TimeseriesMetadata; 
List<SequenceMetadata> sequenceUpsertList = // list of SequenceMetadata; 

List<Relationship> relationshipList = new ArrayList<>(); 

//EVENT AND ASSET 
relationshipList.add( 
     Relationship.newBuilder() 
          .setStartTime(Instant.now().toEpochMilli()) 
          .setEndTime(Instant.now().toEpochMilli()) 
          .setSourceType(Relationship.ResourceType.EVENT) 
          .setSourceExternalId(eventUpsertList.get(0).getExternalId()) 
          .setTargetType(Relationship.ResourceType.ASSET) 
          .setTargetExternalId(assetUpsertList.get(0).getExternalId()) 
          .setConfidence(ThreadLocalRandom.current().nextFloat()) 
          .build()); 

//TIME_SERIES AND ASSET 
relationshipList.add( 
     Relationship.newBuilder() 
          .setStartTime(Instant.now().toEpochMilli()) 
          .setEndTime(Instant.now().toEpochMilli()) 
          .setSourceType(Relationship.ResourceType.TIME_SERIES) 
          .setSourceExternalId(timseriesUpsertList.get(1).getExternalId()) 
          .setTargetType(Relationship.ResourceType.ASSET) 
          .setTargetExternalId(assetUpsertList.get(1).getExternalId()) 
          .setConfidence(ThreadLocalRandom.current().nextFloat()) 
          .build()); 

//SEQUENCE AND EVENT 
relationshipList.add( 
     Relationship.newBuilder() 
          .setStartTime(Instant.now().toEpochMilli()) 
          .setEndTime(Instant.now().toEpochMilli()) 
          .setSourceType(Relationship.ResourceType.SEQUENCE) 
          .setSourceExternalId(sequenceUpsertList.get(2).getExternalId()) 
          .setTargetType(Relationship.ResourceType.EVENT) 
          .setTargetExternalId(eventUpsertList.get(2).getExternalId()) 
          .setConfidence(ThreadLocalRandom.current().nextFloat()) 
          .build()); 

List<Relationship> upsertRelationshipsList = client.relationships() 
          .upsert(relationshipList); 

curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/relationships \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "externalId": "<string>",
      "sourceExternalId": "<string>",
      "targetExternalId": "<string>",
      "startTime": 1730204346000,
      "endTime": 1730204346000,
      "confidence": 0.5,
      "dataSetId": 4503599627370496,
      "labels": [
        {
          "externalId": "my.known.id"
        }
      ]
    }
  ]
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{cluster}.cognitedata.com/api/v1/projects/{project}/relationships",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'items' => [
        [
                'externalId' => '<string>',
                'sourceExternalId' => '<string>',
                'targetExternalId' => '<string>',
                'startTime' => 1730204346000,
                'endTime' => 1730204346000,
                'confidence' => 0.5,
                'dataSetId' => 4503599627370496,
                'labels' => [
                                [
                                                                'externalId' => 'my.known.id'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{cluster}.cognitedata.com/api/v1/projects/{project}/relationships"

	payload := strings.NewReader("{\n  \"items\": [\n    {\n      \"externalId\": \"<string>\",\n      \"sourceExternalId\": \"<string>\",\n      \"targetExternalId\": \"<string>\",\n      \"startTime\": 1730204346000,\n      \"endTime\": 1730204346000,\n      \"confidence\": 0.5,\n      \"dataSetId\": 4503599627370496,\n      \"labels\": [\n        {\n          \"externalId\": \"my.known.id\"\n        }\n      ]\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://{cluster}.cognitedata.com/api/v1/projects/{project}/relationships")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    {\n      \"externalId\": \"<string>\",\n      \"sourceExternalId\": \"<string>\",\n      \"targetExternalId\": \"<string>\",\n      \"startTime\": 1730204346000,\n      \"endTime\": 1730204346000,\n      \"confidence\": 0.5,\n      \"dataSetId\": 4503599627370496,\n      \"labels\": [\n        {\n          \"externalId\": \"my.known.id\"\n        }\n      ]\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "items": [
    {
      "externalId": "<string>",
      "sourceExternalId": "<string>",
      "targetExternalId": "<string>",
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000,
      "startTime": 1730204346000,
      "endTime": 1730204346000,
      "confidence": 0.5,
      "dataSetId": 4503599627370496,
      "labels": [
        {
          "externalId": "my.known.id"
        }
      ]
    }
  ]
}

{
  "error": {
    "code": 409,
    "message": "Could not authenticate.",
    "missing": [
      {}
    ],
    "duplicated": [
      {}
    ]
  }
}

{
  "error": {
    "code": 409,
    "message": "Could not authenticate.",
    "missing": [
      {}
    ],
    "duplicated": [
      {}
    ]
  }
}

{
  "error": {
    "code": 409,
    "message": "Could not authenticate.",
    "missing": [
      {}
    ],
    "duplicated": [
      {}
    ]
  }
}