[vwnc] [vw 7.5 bug] SortedCollection.sortBlock not carried forward by #groupedBy:

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Hmmm. That's an interesting one. The groupedBy: operation does a self species withAll: for the sub-collections. That loses the sort block. We could do something like copyEmpty instead, but the problem is that that would break if you just used an interval. Perhaps intervals should implement copyEmpty to e.g. return an array? But there might be other cases as well, where self species ~= self class.

At 11:22 AM 1/26/2009, Paul Baumann wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
         boundary="_000_CD50A3C7334E0F47B37D6244B310A02806497CBF29atbpixmx02CPE_"

((1 to: 10) asSortedCollection: [:a :b | a > b])
    groupedBy: [:ea | ea even ]
 
 Dictionary (true->SortedCollection (2 4 6 8 10) false->SortedCollection (1 3 5 7 9) )
Notice that the grouped items are no longer in the requested (a > b) sequence. Here is an example of the problem that this causes:
 
(((1 to: 10) collect: [:ea | ea asValue])
        asSortedCollection: [:a :b | a value > b value])
            groupedBy: [:ea | ea value even ]
A collection of domain objects that was sorted by attribute value raised MNU #<= when grouped.
 
Paul Baumann
 

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Hmmm. That's an interesting one. The groupedBy: operation does a self species withAll: for the sub-collections. That loses the sort block. We could do something like copyEmpty instead, but the problem is that that would break if you just used an interval. Perhaps intervals should implement copyEmpty to e.g. return an array? But there might be other cases as well, where self species ~= self class.

At 11:22 AM 1/26/2009, Paul Baumann wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
         boundary="_000_CD50A3C7334E0F47B37D6244B310A02806497CBF29atbpixmx02CPE_"

((1 to: 10) asSortedCollection: [:a :b | a > b])
    groupedBy: [:ea | ea even ]
 
 Dictionary (true->SortedCollection (2 4 6 8 10) false->SortedCollection (1 3 5 7 9) )
Notice that the grouped items are no longer in the requested (a > b) sequence. Here is an example of the problem that this causes:
 
(((1 to: 10) collect: [:ea | ea asValue])
        asSortedCollection: [:a :b | a value > b value])
            groupedBy: [:ea | ea value even ]
A collection of domain objects that was sorted by attribute value raised MNU #<= when grouped.
 
Paul Baumann
 

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Hmmm. That's an interesting one. The groupedBy: operation does a self species withAll: for the sub-collections. That loses the sort block. We could do something like copyEmpty instead, but the problem is that that would break if you just used an interval. Perhaps intervals should implement copyEmpty to e.g. return an array? But there might be other cases as well, where self species ~= self class.

At 11:22 AM 1/26/2009, Paul Baumann wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
         boundary="_000_CD50A3C7334E0F47B37D6244B310A02806497CBF29atbpixmx02CPE_"

((1 to: 10) asSortedCollection: [:a :b | a > b])
    groupedBy: [:ea | ea even ]
 
 Dictionary (true->SortedCollection (2 4 6 8 10) false->SortedCollection (1 3 5 7 9) )
Notice that the grouped items are no longer in the requested (a > b) sequence. Here is an example of the problem that this causes:
 
(((1 to: 10) collect: [:ea | ea asValue])
        asSortedCollection: [:a :b | a value > b value])
            groupedBy: [:ea | ea value even ]
A collection of domain objects that was sorted by attribute value raised MNU #<= when grouped.
 
Paul Baumann
 

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