angular-http-recursive-fetch.js

/**
 * @param {*} class         Class of instance
 * @param {*} root          Data holder instance
 * @param {*} relationName  name of Meta relation, gets mapped to e.g. Single, List
 */
SomeService.prototype.fetchRecursive = function (clazz, root, relationName) {
    let vm = this;
    let deferred = this.$q.defer();
    let service = this.$injector.get(clazz.serviceInstanceId());
    let relation = clazz.getAttributeByName(relationName);
    service
        .getListItems(relation, root.id)
        .then(function(response){
            vm.$q
                .all(response.data.map((child) => {
                    if (!root.hasOwnProperty(relation.name)) {
                        root[relation.name] = [];
                    }
                    root[relation.name].push(child);
                    child.parent = root;
                    let childClass = vm.metaContainer.getFromUniquesById(child.xmiid);
                    return vm.fetchRecursive(childClass, child, relationName);
                }))
                .then(() => {
                    deferred.resolve(root);
                }, (err) => {
                    deferred.reject(err);
                });
        });
    return deferred.promise;
};