#read: for magma reader

[Sebastian Sastre]

Never mind. The #distinct: message was introducing the nose here. Now it
seems to work fine. Anybody see any problem with that #read: implementation
to be able to count magma things?

	thanks, 

Sebastian Sastre


> -----Mensaje original-----
> De: magma-bounces at lists.squeakfoundation.org 
> [mailto:magma-bounces at lists.squeakfoundation.org] En nombre 
> de Sebastian Sastre
> Enviado el: Martes, 12 de Febrero de 2008 12:40
> Para: magma at lists.squeakfoundation.org
> Asunto: #read: for magma reader
> 
> Hi there,
> 
> 	I have a kind of object stored on magmacollections 
> which has been indexed by an attribute which returns N dates. 
> I've made an index which is pretty much like MaKeywordIndex 
> but for DateAndTimes.
> 
> 	It works well. Now I need a metric on those objects to 
> score them regarding to the number of ocurrences of the dates 
> they will be found on the odb. So I have:
> 
> scoringLevel
> 	"Answers the quantity of dates of some relevance for 
> the receiver."
> 
> 	^ ((self elements where:[:reader|
> 		(reader 
> 			read: #relevantDates
> 			from: (Date today subtractDays: self 
> daysBack) asDateAndTime 
> 			to: DateAndTime now)])
> 				distinct: true) size
> 
> 	by now I've set 2 years by answering 360*2 in daysBack 
> but what if I want the socing for whole thing?
> 
> 	I've tried #read: without parameters other than the 
> index name but then I've realized is not implemented in magma 
> reader. I wish I can do something to count occurrences of my 
> query like:
> 
> scoringLevel
> 	"Answers the quantity of dates of some relevance for 
> the receiver."
> 
> 	^ ((self elements where:[:reader|
> 		reader read: #relevantDates])
> 			distinct: true) size
> 
> 
> So taking a look in the reader and indexes I figured I put in 
> my *MagmaExtensions this method:
> 
> MagmaCollectionReader>>read: attributeSymbol
> 	"Answers a MaLargeCollectionReader with access to all 
> its elements.
> 	NOTE: warning, is the whole thing, use smartly"
> 
> 	^ [:index| 
> 		self
> 			readIndex: index
> 			fromHash: index lowestPossibleKey 
> 			toHash: index highestPossibleKey] value: (self
> indexNamed: attributeSymbol)
> 
> 	But this it's returning a MaClause and no a reader as 
> expected? Any clue on whats happening?
> 
> 	thanks,
> 
> Sebastian Sastre
> 
> 
> 
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