ProductHint with allowUnknownKeys=false misbehaves

ProductHint with allowUnknownKeys=false misbehaves with pureconfig.loadConfig and pureconfig.loadConfigOrThrow.

I made a demo project to show the issue. Here is the relevant section. This code does not reference application.conf and should not try to pull in reference.conf.

implicit val hint: ProductHint[PureConfigFun] = ProductHint[PureConfigFun](allowUnknownKeys = false)
pureconfig.loadConfigOrThrow[PureConfigFun](Paths.get("pure.conf"))

Here is the error:

pureconfig.error.ConfigReaderException: Cannot convert configuration to a value of class PureConfigFun. Failures are:
  Other failures:
    -  UnknownKey(path,None)
    -  UnknownKey(file,None)
    -  UnknownKey(java,None)
    -  UnknownKey(os,None)
    -  UnknownKey(line,None)
    -  UnknownKey(user,None)
    -  UnknownKey(sun,None)
    -  UnknownKey(akka,None)
    -  UnknownKey(awt,None)

My app does not contain application.conf. Based on the error message, it looks like PureConfig compares against reference.conf, instead of just looking at pure.conf.

[melrief]

For the UnknownKeys errors, the issue is that the default fieldMapping is KebabCase. See the doc. But the keys in your configuration are CamelCase. To configure to use CamelCase as field mapping, change the hint to

implicit val hint: ProductHint[PureConfigFun] =
  ProductHint[PureConfigFun](
    allowUnknownKeys = false,
    fieldMapping = ConfigFieldMapping(CamelCase, CamelCase)
  )

And everything should work

sbt "runMain PureConfigTest2"
[info] Loading global plugins from /home/mariop/.sbt/0.13/plugins
[info] Loading project definition from /home/mariop/prog/pure-config-test/project
[info] Set current project to pure-config-test (in build file:/home/mariop/prog/pure-config-test/)
PureConfigFun(ConsoleConfig(true),FeedConfig(Port(9090)),ReplConfig(~),SpeciesDefaults(0,100,25,20),SshServer(localhost,/home/mariop,true,None,,Port(1101),repl))
[success] Total time: 16 s, completed Feb 26, 2017 6:18:56 PM

[melrief]

@mslinn I’m closing this as resolved