function UpdateForeignKey(id, field, fieldValue) {
    var context = getContext();
    var coll = context.getCollection();
    var link = coll.getSelfLink();
    var response = context.getResponse();
    if (!id) throw new Error('The ID is undefined.');
    if (!field) throw new Error('The field is undefined.');
    if (!fieldValue) throw new Error('The fieldValue is undefined')
    var query = 'SELECT * FROM Devices hr WHERE hr.id = "' + id + '"';
    var run = coll.queryDocuments(link, query, {}, callback);


    function callback(err, docs) {
        if (err) throw err;
        if (docs.length > 0) UpdateDoc(docs[0]);
        else response.setBody('The document was not found.');
    }
    if (!run) {     throw new Error('The stored procedure could not be processed.');   }
    function UpdateDoc(doc) {
        switch (field) {
            case "Customer":
                 doc.CustomerId = fieldValue;
            case "Hub":
                doc.IoTHubId = fieldValue;
            case "Files":
                doc.FileId = fieldValue;
            case "Location":
                doc.LocationId = fieldValue;
            case "Attributes":
                doc.AttributesId = fieldValue;
            case "Key":
                doc.Key = fieldValue;
            case "Schedule":
                doc.DeviceId = fieldValue;
            case "Status":
                doc.Status = fieldValue;
            case "StatusCode":
                doc.StatusCode = fieldValue;


        }
        var replace = coll.replaceDocument(doc._self, doc, {},      function(err, newdoc) {
            if (err) throw err;
            response.setBody(newdoc);
        });
        if (!replace) {       throw new Error('The document could not be updated.');     }
    }
}