Hi,
Am 06.01.2012 um 18:23 schrieb Chris McBride:
> (defrecord Person [name address])
>
> (def bob (map->Person {:name "bob"}))
>
> (prn (conj bob {:address "123 main st"})) ;#user.Person{:name
> "bob", :address "123 main st"}
> (prn (conj {:address "123 main st"} bob)) ;{:name "bob", :address
> nil}
>
>
> The first print statement behaves how I would expect, the second one
> does not. Why wouldnt it fill the address field on the map?
The address field on the record is nil. Hence it overwrites the address field
of the map. Think of merge. This has nothing to do with records. It's the same
with maps.
user=> (conj {:a nil} {:a 1})
{:a 1}
user=> (conj {:a 1} {:a nil})
{:a nil}
The fields in records are always there. Unlike maps where there are only the
keys you specified.
user=> (map->Person {:name "Meikel"})
#user.Person{:name "Meikel", :address nil}
Hope this helps.
Sincerely
Meikel
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