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Last active December 14, 2015 09:09
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How to write a #Json #Reads which replaces a key by another one and prunes the original branch ? #play2.1 #scala
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solution.scala
val reads = __.json.update( // copies the full JSON
(__ \ "_id").json.copyFrom( (__ \ 'id).json.pick ) // adds _id
) andThen (__ \ "id").json.prune) // and after removes id
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