On 04/05/2010, at 11:18 AM, Chuck Hill wrote:
> On May 3, 2010, at 5:38 PM, Baiss Eric Magnusson wrote:
>
>> I have an Owner, the Owner has many Transactions.
>>
>> <...>
>> In the pages Constructor I used:
>> ...
>> public ERXBatchingDisplayGroup<Transaction> curTrans;
>> ...
>> curTrans.queryBindings().setObjectForKey( … );
>> try {
>> curTrans.setObjectArray( theOwner.transactions() );
>> curTrans.qualifyDataSource();
>
> That looks... odd. Especially this part: curTrans.setObjectArray(
> theOwner.transactions() ) I'd expect to set ERXBatchingDisplayGroup up for
> Transaction and use a qualifier like "owner = $owner and date >= $startMonth
> and date < $endMonth" Passing in theOwner.transactions() is likely to remove
> a lot of the benefit.
>
>
> I don't use model (or wherever you are getting this from) display groups, so
> I don't know what do tell you. In code it would look something like this:
>
>
> dataSource = new EODatabaseDataSource(editingContext(),
> entityName());
>
>
> dataSource.fetchSpecification().setPrefetchingRelationshipKeyPaths(prefetchingRelationshipKeyPaths());
> dataSource.fetchSpecification().setRefreshesRefetchedObjects(
> refreshesRefetchedObjects() );
> dataSource.fetchSpecification().setIsDeep( true );
> dataSource().fetchSpecification().setQualifier(qualifier());
> displayGroup.setDataSource(dataSource);
> <...>
>> What do I need to do to set the data source, I thought that <setObjectArray>
>> was the way to do it, but no, it always crashes?
>
> I've sketched out what I do, but I lifted that from other pieces of code, so
> it is only a rough sketch.
Below is a another/similar sketch of usage of ERXBatchingDisplayGroup that I'm
using. I've had to adjust a little from what I do as I'm subclassing all of
ERXBatchingDisplayGroup, EOArrayDataSource, ERXDatabaseDataSource.
with regards,
--
Lachlan Deck
public ERXBatchingDisplayGroup getDisplayGroup()
{
if ( this.displayGroup == null )
{
this.displayGroup = new ERXBatchingDisplayGroup();
getDisplayGroup().setDelegate( new
MyDefaultDisplayGroupDelegate() );
EODataSource dataSource = null;
if ( hasObjects() )
{
EOArrayDataSource arrayDataSource = new
EOArrayDataSource(...);
arrayDataSource.setArray( getObjects() );
dataSource = arrayDataSource;
}
else
{
EOFetchSpecification spec = new EOFetchSpecification(
getEntityName(), getQualifier(), getSortOrderings() );
spec.setUsesDistinct( true );
spec.setRefreshesRefetchedObjects( false );
ERXDatabaseDataSource dbDataSource = new
ERXDatabaseDataSource(...);
dbDataSource.setFetchSpecification( spec );
dbDataSource.setRefreshesRefetchedObjects( false );
dataSource = dbDataSource;
}
getDisplayGroup().setDataSource( dataSource );
if ( getObjectsPerBatch().intValue() > 0 )
{
getDisplayGroup().setNumberOfObjectsPerBatch(
getNumberOfObjectsPerBatch() );
}
getDisplayGroup().fetch();
if ( getBatchIndex() != null ) // e.g., from query param
{
getDisplayGroup().setCurrentBatchIndex( getBatchIndex()
);
getDisplayGroup().fetch();
}
}
return this.displayGroup;
} _______________________________________________
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