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If a query returns a nested structure from a JSON(b) field, the empty field must be absent for the query to work. If the field is present and null
, there is a circe exception thrown.
Example query:
sql"SELECT address->'coordinates' FROM profile"
Definition of the Coordinates and Address types:
case class Coordinates(latitude: Double, longitude: Double)
case class Address(coordinates: Option[Coordinates])
Definition of the custom mapping:
given Meta[Coordinates] = new Meta(pgDecoderGet, pgEncoderPut)
given Meta[Address] = new Meta(pgDecoderGet, pgEncoderPut)
The query works for the following contents of the address
column:
NULL
{}
The query throws and exception for the following contents of the address
column:
{"coordinates":null}
The exception message is: io.circe.DecodingFailure$DecodingFailureImpl: DecodingFailure at : Got value 'null' with wrong type, expecting object
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