ice.fo.utils/Builder/addLastChildrenFoInstance.js

export default async function addLastChildrenFoInstance({
  $axios, parentId, componentId, props,
}) {
  const [{ data: newData }, { data: parentData }] = await Promise.all([
    $axios.request({
      url: '/adm/foInstance/save',
      method: 'post',
      data: {
        component: componentId,
        props,
        layout: null,
      },
    }),
    $axios.request({
      url: '/adm/foInstance/read',
      params: {
        id: parentId,
      },
    }),
  ]);

  const newInstance = newData.item;
  const parentInstance = parentData.item;

  const newInstanceId = newInstance.id;
  const parentChildrenIds = (parentInstance.instances || []).map((i) => i.id);

  // add/push new instance to last children
  parentChildrenIds.push(newInstanceId);

  await $axios.request({
    url: '/adm/foInstance/save',
    method: 'post',
    data: {
      instanceId: parentId,
      instances: parentChildrenIds.join(','),
    },
  });

  return newInstance;
}