CODEWITHSUNDEEP
mongodbhaskell
r.sendecky
r.sendecky

Reputation: 10383

Haskell mongodb: object id as string

What is the correct way of retrieving object id as string? I am getting type errors and cant figure out how to cast it. Calling 'show' on it does not work.

Also, the other way round, if i have object id as string received from URL, for instance,how do I write it back to mongo. I don't understand how to convert it correctly.

Upvotes: 0

Views: 699

Answers (1)

Yuras
Yuras

Reputation: 13876

I assume you are using mongoDB driver. ObjectId has Show and Read instances. Example:

import Database.MongoDB
import Text.Read

main :: IO ()
main = do
  oid <- genObjectId
  putStrLn $ show oid
  print (readEither (show oid) :: Either String ObjectId)

Output:

51d16cec08d0cf312a000000
Right 51d16cec08d0cf312a000000

Upvotes: 2

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