Peter.
Thank you very much.
On Aug 14, 2010, at 12:27 AM, Peter Ammon wrote:
> 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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