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clojure.walk should support records

Description

Problem: clojure.walk throws exceptions if used on records.

Current Patch: 0001-CLJ-1105-Support-records-in-clojure.walk.patch adds a special case for records.

See also: "faster, more flexible dispatch for clojure.walk" which could supersede this ticket.

Screened by: Alex Miller - I think this will likely be superseded by in the future, but this is a reasonable short-term step.

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Andy Fingerhut February 14, 2014 at 7:54 PM

This comment would probably get more visibility on CLJ-1239, given that this one is closed and is still open.

chouser February 14, 2014 at 7:50 PM

The way this patch behaves can be surprising compared to regular maps:

(clojure.walk/prewalk-replace {[:a 1] nil} {:a 1, :b 2})
;=> {:b 2}

(defrecord Foo [a b])
(clojure.walk/prewalk-replace {[:a 1] nil} (map->Foo {:a 1, :b 2}))
;=> #user.Foo{:a 1, :b 2}

Note how the [:a 1] entry is removed from the map, but not from the record.

I believe also demonstrates this behavior.

Nicola Mometto July 29, 2013 at 6:45 PM

clojure.walk is not required during bootstrapping, so I don't see why we couldn't just substitute clojure.walk with clojure.walk2 given that it only changes the internal implementation to a faster one

Stuart Sierra July 29, 2013 at 6:15 PM

Attachment 0001-CLJ-1105-Support-records-in-clojure.walk.patch is a minimal patch adding support for records without altering the design of clojure.walk.

Alex Miller July 26, 2013 at 4:18 PM

Update title and adjust description slightly to focus this ticket on being an enhancement to make clojure.walk work with records.

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Created November 8, 2012 at 2:20 PM
Updated February 14, 2014 at 7:54 PM
Resolved February 14, 2014 at 7:54 PM