Generic customisation of case class ToString [duplicate]

Question

On this link: https://stackoverflow.com/a/4055850/82609

It explains that

case class Person(name: String, age: Int) { override def productPrefix = "person: " } // prints "person: (Aaron,28)" instead of "Person(Aaron, 28)" println(Person("Aaron", 28))

Is there a way to do something like mixing the case class with some trait do provide a better ToString than the default one?

I don't really like to not have the field names printed, and for large case classes it is sometimes hard to read the logs.

Is it possible to have an output like this?

Person( name="Aaron", age=28 )

rlegendi · Accepted Answer · 2013-07-05 15:08:32Z

15

How about overriding toString()? You can do that even in a specific trait (or each time at the level of the case class and calling an object function).

trait CustomToString { override def toString() = "do some reflection magic here" } case class Person(name: String, age: Int) extends CustomToString println(Person("Belä", 222))

edited Jul 5, 2013 at 15:08

answered Jul 5, 2013 at 14:00

rlegendi

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5 Comments

Sebastien Lorber Over a year ago

this is not a generic solution and I'd like to reuse it in many case classes

rlegendi Over a year ago

How about the updated answer?

Sebastien Lorber Over a year ago

I'll accept, but some answers are more appropriate in the "possible duplicate" link provided here: stackoverflow.com/questions/15718506/…

rlegendi Over a year ago

Yeah, surely you can do more with external libraries. First hit on Google for instance was this which is definitely what you're looking for: github.com/ymasory/labeled-tostring

piotr Over a year ago

I posted a solution using reflection at the bottom of: issues.scala-lang.org/browse/SI-3967

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