How to use the breeze-client.FetchStrategy.FromLocalCache function in breeze-client

getUser(username: string) {

        // Already fetched, then query locally
        let alreadyFetched = this.fetchedUsers.indexOf(username) > -1;

        let query = EntityQuery
            .from("Users")
            .expand("ResourcePoolSet")
            .where("UserName", "eq", username);

        // From server or local?
        if (alreadyFetched) {
            query = query.using(FetchStrategy.FromLocalCache);
        } else {
            query = query.using(FetchStrategy.FromServer);
        }

        return this.executeQuery(query)
            .map((response: any) => {

                // If there is no result
                if (response.results.length === 0) {
                    return null;
                }

                var user = response.results[0];

                // Add to fetched list
                if (!alreadyFetched) {

if (this.dataService.currentUser.isAuthenticated()) {
            query = query.expand("User, UserResourcePoolSet, ElementSet.ElementFieldSet.UserElementFieldSet, ElementSet.ElementItemSet.ElementCellSet.UserElementCellSet");
        } else {
            query = query.expand("User, ElementSet.ElementFieldSet, ElementSet.ElementItemSet.ElementCellSet");
        }

        var userNamePredicate = new Predicate("User.UserName", "eq", resourcePoolUniqueKey.username);
        var resourcePoolKeyPredicate = new Predicate("Key", "eq", resourcePoolUniqueKey.resourcePoolKey);

        query = query.where(userNamePredicate.and(resourcePoolKeyPredicate));

        // From server or local?
        if (!fetchedEarlier) {
            query = query.using(FetchStrategy.FromServer);
        } else {
            query = query.using(FetchStrategy.FromLocalCache);
        }

        return this.dataService.executeQuery(query)
            .map((response: any): any => {

                // If there is no cmrp with this Id, return null
                if (response.results.length === 0) {
                    return null;
                }

                // ResourcePool
                var resourcePool = response.results[0];

                // Todo Is there a better way of doing this? / coni2k - 25 Feb. '17
                // Events handlers
                resourcePool.ElementSet.forEach((element: Element) => {

getUser(username: string) {

        // Already fetched, then query locally
        let alreadyFetched = this.fetchedUsers.indexOf(username) > -1;

        let query = EntityQuery
            .from("Users")
            .expand("ResourcePoolSet")
            .where("UserName", "eq", username);

        // From server or local?
        if (alreadyFetched) {
            query = query.using(FetchStrategy.FromLocalCache);
        } else {
            query = query.using(FetchStrategy.FromServer);
        }

        return this.executeQuery(query)
            .map((response: any) => {

                // If there is no result
                if (response.results.length === 0) {
                    return null;
                }

                var user = response.results[0];

                // Add to fetched list
                if (!alreadyFetched) {