You can get the left and right expressions, etc. by calling through to super:
NSComparisonPredicate *superPredicate = [super
predicateWithSubpredicates:subpredicates];
NSExpression *lhs = [superPredicate leftExpression], *rhs = [superPredicate
rightExpression];
...
You would return a new predicate constructed from from the pieces of super's
predicate, except substitute in your own modifier.
-Peter
On Aug 13, 2010, at 3:12 PM, Gustavo Pizano wrote:
> 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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