appwrite/docs/examples/1.4.x/server-rest/examples/databases/create-relationship-attribute.md

POST /v1/databases/{databaseId}/collections/{collectionId}/attributes/relationship HTTP/1.1 Host: HOSTNAME Content-Type: application/json X-Appwrite-Response-Format: 1.4.0 X-Appwrite-Project: 5df5acd0d48c2 X-Appwrite-Key: 919c2d18fb5d4...a2ae413da83346ad2

{ "relatedCollectionId": "[RELATED_COLLECTION_ID]", "type": "oneToOne", "twoWay": false, "key": , "twoWayKey": , "onDelete": "cascade" }