For the partition-by solution to work, you have to ensure that the result set from the query is sorted by the foreign key:
(partition-by identity "aaabbbcccaaabbbcc") ;;=> ((\a \a \a) (\b \b \b) (\c \c \c) (\a \a \a) (\b \b \b) (\c \c)) (partition-by identity (sort "aaabbbcccaaabbbcc")) ;;=> ((\a \a \a \a \a \a) (\b \b \b \b \b \b) (\c \c \c \c \c)) On Monday, August 12, 2013 11:17:29 AM UTC-7, Colin Yates wrote: > > Great - thanks! > > > On 12 August 2013 19:07, Jonah Benton <jo...@jonah.com <javascript:>>wrote: > >> >> Sounds like a job for partition-by: >> >> http://clojuredocs.org/clojure_core/clojure.core/partition-by >> >> >> >> On Mon, Aug 12, 2013 at 1:55 PM, Colin Yates <colin...@gmail.com<javascript:> >> > wrote: >> >>> Is there such a thing as a lazy group-by for a sequence of elements when >>> the elements are sorted on the criteria used to group them? I can imagine >>> how one would look in a few lines of Clojure code but I am surprised there >>> isn't one already. >>> >>> My actual criteria is that I am pulling things from a database that live >>> on the "many" side of a one-many and I want to sort on the "one" FK. >>> >>> This is all based on the assumption that >>> http://clojuredocs.org/clojure_core/clojure.core/group-by is eager! >>> >>> -- >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clo...@googlegroups.com<javascript:> >>> Note that posts from new members are moderated - please be patient with >>> your first post. >>> To unsubscribe from this group, send email to >>> clojure+u...@googlegroups.com <javascript:> >>> For more options, visit this group at >>> http://groups.google.com/group/clojure?hl=en >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to clojure+u...@googlegroups.com <javascript:>. >>> >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com<javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "Clojure" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/clojure/yGP0Ac_CUkY/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
