loopback/test/fixtures/simple-integration-app/common/models/customer.json

{
  "name": "customer",
  "base": "PersistedModel",
  "properties": {
    "name": {
      "type": "string",
      "required": true
    }
  },
  "relations": {
    "profile": {
      "type": "hasOne",
      "model": "profile"
    }
  }
}