So does no one here use congomongo? On Sat, Jul 10, 2010 at 1:17 PM, Mark Engelberg <mark.engelb...@gmail.com> wrote: > Let's say I have a table called :table, and a column called :col, and > I want to go through all the records in the table and set the :col > value to 0. I had been doing it like this: > (defn update-db! [] > (doseq [entry (fetch :table)] > (update! :table entry (assoc entry :col 0)))) > > but the other day I noticed that this was mysteriously skipping over > certain records, and not everything was getting updated. So I > switched to this: > > (defn update-db! [] > (doseq [entry (doall (fetch :table))] > (update! :table entry (assoc entry :col 0)))) > > which worked just fine. I speculate that somehow the update process > screws with whatever iteration process that fetch uses to deliver the > records lazily. However, now my update process is limited by the > number of records I can hold in memory. > > So, is there some sort of recipe for updating all records without > first loading them all into memory? >
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