[2.0] diverging implicit expansion for type play.api.libs.json.Writes[java.lang.String]

[Manuel Bernhardt]

Hi,

every time I attempt to use the built-in JSON library of Play, I get
bitten by the message above, get upset and use jerkson or whatever
else. Then I forget and some months try again...

So this time I'm writing a mail instead.

Does anyone have an idea what is going wrong?

https://gist.github.com/3513352

Thanks,

Manuel

[Will Sargent]

Take out the toJson calls, and use JsString.

Will.

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[Manuel Bernhardt]

Hi Will,

is there an implicit conversion I should have in scope then in order
to turn the Map into a JsValue? I tried to use toJson on the top-level
Map, but that's still leading to the same error
(https://gist.github.com/3513352). Without the toJson I get the wrong
type.

Thanks,

Manuel

[Sadache Aldrobi]

This issue is solved on master, you have a nicer Json constructor.

For prior versions, you can not transform a Map[String,Any] into JSON, you need to transform each field, or have a homogenous non Any Map.

www.sadekdrobi.com
ʎdoɹʇuǝ

[Manuel Bernhardt]

Thanks, building everything by hand via JsObject-s, JsArray-s etc is
cumbersome but works.