[CAY-788] prefetch can set state to modified

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2 branch, 2.0 branch, 3.0
• Fix Version/s: 3.0M1
• Component/s: Core Library
• Environment: cayenne-2.0.2, java 5, a mac, PostgreSQL and Derby
• Assignee: Tore Halset
• Reporter: Tore Halset
• Created: 08/May/07 09:36
• Updated: 09/Nov/08 01:14
• Resolved: 17/Jun/07 20:59

Description

I have a situation where adding a prefetch to a simple select query set the persistence state to "modified" even though they are not modified. Here are the stacktrace to where the state are set to modified:

at myapp.data.A.setPersistenceState(A.java:47)
at org.apache.cayenne.access.ObjectStore.registerDiff(ObjectStore.java:167)
at org.apache.cayenne.access.DataContext.propertyChanged(DataContext.java:1838)
at org.apache.cayenne.CayenneDataObject.writeProperty(CayenneDataObject.java:227)
at org.apache.cayenne.access.PrefetchProcessorNode.linkToParent(PrefetchProcessorNode.java:90)
at org.apache.cayenne.access.ObjectTreeResolver$DisjointProcessor.startDisjointPrefetch(ObjectTreeResolver.java:359)
at org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:167)
at org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:180)
at org.apache.cayenne.access.ObjectTreeResolver.resolveObjectTree(ObjectTreeResolver.java:87)
at org.apache.cayenne.access.ObjectTreeResolver.synchronizedObjectsFromDataRows(ObjectTreeResolver.java:69)
at org.apache.cayenne.access.DataDomainQueryAction.interceptObjectConversion(DataDomainQueryAction.java:328)
at org.apache.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:116)
at org.apache.cayenne.access.DataDomain.onQuery(DataDomain.java:746)
at org.apache.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:217)
at org.apache.cayenne.access.DataContextQueryAction.execute(DataContextQueryAction.java:54)
at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:1387)
at org.apache.cayenne.access.DataContext.performQuery(DataContext.java:1376)

Here are the query:
DataContext ctxt = createDataContext();
SelectQuery query = new SelectQuery(A.class);
query.addPrefetch(A.B_PROPERTY);
List daos = ctxt.performQuery(query);

The relationship is a one-to-one and the primary key are compond of one String and 3 ints.