Peter hello, first of all thanks for the reply.
So yes, I need to cross a to-many relationship. let me see if I got this
straight because my mind was heading in that same direction you commented, just
I didn't know what to use or what was the name of the artifact, in this case
the NSComparasionPredicateModifier.
So due the fact that I already have overwritten NSPredicateEditorRowTemplate to
enlarge the Floating-Decimal NSTextfield of the right expression, I would take
that approach first, overwriden the predicateWithSubpredicates method and
doing the following:
- (NSPredicate *)predicateWithSubpredicates:(NSArray *)subpredicates{
NSPredicate * predicate = [NSComparasionPredicate
predicateWithLeftExpression:(NSExpression *)lhs
rightExpression:(NSExpression*)rhs modifier: NSAllPredicateModifier
type:(NSPredicateOperatorType)type options:NSCaseInsensitivePredicateOption];
}
I don't know what lhs, rhs and type must be. should I pass [[self
leftExpresions] objectAtIndex:0] and also for the rightExpresion? or does it
comes from the subpredicates parameter?.
sorry I got little confused there... :(
Thx
Gustavo
On Aug 13, 2010, at 11:49 PM, Peter Ammon wrote:
>
> On Aug 13, 2010, at 8:45 AM, Gustavo Pizano wrote:
>
>> Hello all once again.
>>
>> I have been searching but I hadn't found something useful, so please before
>> if you know a place I can look at let me know.
>>
>> I have these 3 Entities
>>
>> ExpenditureGroup:
>> name
>> icon.
>> -----------------------
>> toExpenditures. ->>
>>
>>
>> Expenditure
>> creationDate
>> location
>> total
>> --------------------
>> toExpenditureGroup ->
>> toExpenditureDetails ->>
>>
>>
>> ExpenditureDetail
>> detailDescrb
>> subTotal
>> ----------------------
>> toExpenditure ->
>>
>> also I have an arrayController that fetches all the ExpenditureGroup
>> Entities called _expenditureGorupArrayController.
>>
>> in my predicate editor I added the NSPredicateEditorRowTemplates with key
>> paths for toExpenditures.location, toExpenditures.creationDate,
>> toExpenditures.total, toExpenditures.toExpenditrueDetails.detailDescrb and
>> finally toExpenditures.toExpenditureDetails.subTotal.
>>
>> I dunno if those last 2 are ok.. my guess NO.
>>
>> anyway, when I set the predicate, Im setting into the
>> _expenditureGroupArrayController setFilterPredicate, and pass the predicate
>> I just created, but nothing seems to work.
>
> Hi Gustavo,
>
> It looks like you want your predicate to cross a "to-many" relation. Is that
> right? If so, you need to create a predicate that has an
> NSComparisonPredicateModifier that knows how to cross to-many relations (that
> is, either NSAllPredicateModifier or NSAnyPredicateModifier).
>
> If you're using NSPredicateEditor to create the predicate, then the
> RowTemplate has to know to create a predicate with the right modifier.
> Unfortunately you cannot yet set that up in IB, but you can do it
> programmatically, by passing the right NSComparisonPredicateModifier to one
> of the initWith... methods on NSPredicateEditorRowTemplate (see its header).
>
> You can also subclass NSPredicateEditorRowTemplate and override
> -predicateWithSubpredicates: to create an NSPredicate with the proper
> modifier.
>
> Hope that helps, let me know if that's not clear,
> -Peter
>
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