sorting by key1 inside of key2

Greetings,

I have a collection of Transaction objects.  They have instance variables of category and payee.

A category might be “Office Expense”  and a payee might be “Costco” or “Amazon”.

I want to sort by categories and then payees.

Office Expense, Amazon…..
…..
….
….
Office Expense, Costco
….
…
…

Here is some of my code:



sorted := trans asSortedCollection:  [:a :b | (a category) < (b category)].

sorted do:  [ :tr |  | cat pay |
              cat := tr category.
              pay := tr payee.
       
              stream nextPutAll: (tr myPrintFormat2).



How do I make the sort block sort on both keys?

Sincerely,

Joe.





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On Thu, Jul 7, 2016 at 10:58 AM, Joseph Alotta <[hidden email]> wrote:
Just guessing...
    [:a :b | (a category) = (b category)
                    ifFalse: [ (a category) < (b category) ]
                    ifTrue: [ (a payee) < (b payee)]].

cheers -ben
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thank you, ben!!


> On Jul 6, 2016, at 11:17 PM, Ben Coman [via Smalltalk] <[hidden email]> wrote:
>
> [:a :b | (a category) = (b category)
>                     ifFalse: [ (a category) < (b category) ]
>                     ifTrue: [ (a payee) < (b payee)]].