Nested JSONAPI Relationships

convert-json.js

function convertRestliEntityToJsonApiDocument(entity, included = []) {
  let [ type, id ] = entity.urn.split(':');
  let attributes = {};
  let relationships = {};
  let resource = { type, id, attributes, relationships };
  let document = { data: resource, included };

  Object.keys(entity).forEach(key => {
    let value = entity[key];
    if ( key === 'urn') return;
    else if (typeof value !== 'object' || value === null) { attributes[key] = value; }
    else if (!value.hasOwnProperty('urn')) {
      let type = 'time-span';
      let id = `${value.unit}:${value.duration}`;
      
      relationships[key] = { data: { type, id } };
      included.push({
        type,
        id,
        attributes: value
      });
    }
    else {
      let resource = convertRestliEntityToJsonApiDocument(value, included);
      included.push(resource.data);
      relationships[key] = { data: { type: resource.data.type, id: resource.data.id } };
    }
  });

LI-sample.js

rawPayload = {
  urn: 'a:1',
  title: 'foo title',
  series: {
    urn: 'b:2',
    publishFrequency: {
      duration: '1',
      unit: 'WEEK'
    },
    description: 'my desc'
  }
}

nested-relationships-json-api.json

{
  data: {
      "id": "8348",
      "type": "aggregated-season-calc-field",
      "attributes": {},
      "relationships": {
           "defaultSettings": {
               "data": { "id": "8348", "type": "default-setting" }
            },
       },
  },
  "included": [
    {
      "type": "default-setting",
      "id": "8348",
      "attributes": {
          "startDate": "2020-12-07",
          "endDate": "2030-12-10",
          "aaaScheduleId": "4",
          "xamortScheduleId": "4",
          "rosEndDate": "2016-12-10",
       },
      "relationships": {
         "expenseSchedule": {
            "data": { "type": "aaa-schedule", "id": "1" }
          }
       }
    }
  ]
}