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mongodb returns count as a double: fix count function

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This commit is contained in:
Scott R. Parish 2010-03-09 15:18:11 -06:00
parent c1b8a21366
commit cbc5128d47
1 changed files with 4 additions and 3 deletions
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7
Database/MongoDB.hs
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@ -468,16 +468,17 @@ fromUpdateFlags flags = List.foldl (.|.) 0 $
flip fmap flags $ (1 `shiftL`) . fromEnum
-- | Return the number of documents in /FullCollection/.
count :: Connection -> FullCollection -> IO Int64
count :: Connection -> FullCollection -> IO Integer
count c col = countMatching c col empty
-- | Return the number of documents in /FullCollection/ matching /Selector/
countMatching :: Connection -> FullCollection -> Selector -> IO Int64
countMatching :: Connection -> FullCollection -> Selector -> IO Integer
countMatching c col sel = do
let (db, col') = splitFullCol col
res <- runCommand c db $ toBsonDoc [("count", toBson col'),
("query", toBson sel)]
return $ fromBson $ fromLookup $ List.lookup (s2L "n") res
let cnt = (fromBson $ fromLookup $ List.lookup (s2L "n") res :: Double)
return $ truncate $ cnt
-- | Delete documents matching /Selector/ from the given /FullCollection/.
delete :: Connection -> FullCollection -> Selector -> IO RequestID