Invalid Query Key when using ReadAllQuery.addOrdering()

Question

Hi,
I have an object called Request mapped to the Request table and a field within it called creator which is mapped to the User object with a 1-1 mapping. the User object is mapped to the user table.
Now when I do addOrdering() with an expression as below and execute the ReadAllQuery, I get an exception which says "Invalid Query Key[lastName]".
raq.addOrdering(raq.getExpressionBuilder().get("creator").get("lastName").ascending());
where raq is an instance of ReadAllQuery.
Have anyone experienced this? Any help would be much appreciated.
Thank you,
Sanjay Mathew.

Answer 1

I double checked and the attribute names look ok.
Please see the code below:
SearchCriteria p_searchCriteria = new SearchCriteria();
sc.setSortAttribute (
"m_creatorUser.m_lastName,m_creatorUser.m_firstName");
sc.setSortOrder(SearchCriteria.ASCENDING);
ReadAllQuery raq = new ReadAllQuery(Request.class, queryExpression);
if (p_searchCriteria.getSortAttribute() != null &&
p_searchCriteria.getSortAttribute().trim().length() > 0) {
StringTokenizer st1 =
new StringTokenizer(p_searchCriteria.getSortAttribute(), ",");
while (st1.hasMoreTokens()) {
ExpressionBuilder eb = raq.getExpressionBuilder();
String sortattr = st1.nextToken();
StringTokenizer st2 = new StringTokenizer(sortattr, ".");
Expression orderexpr = null;
while (st2.hasMoreTokens()) {
String st2Str = st2.nextToken();
if (orderexpr == null)
orderexpr = eb.get(st2Str);
else
orderexpr = orderexpr.get(st2Str);
if (p_searchCriteria.getSortOrder() == null ||
(p_searchCriteria.getSortOrder() != null &&
p_searchCriteria.getSortOrder().equals(SearchCriteria.
ASCENDING))) {
orderexpr = orderexpr.ascending();
} else {
orderexpr = orderexpr.descending();
raq.addOrdering(orderexpr);
I tried creating the expression with hard coded attribute names as well like this:
raq.getExpressionbuilder().get("m_creatorUser").get("m_lastName").ascending()
In both cases I get "Invalid query key" exception.
Sanjay.