hey! do you all use some kind of code style formatter for your kotlin projects? We’re looking into it and have found the spotless plugin but i really don’t like the way ktfmt formats data classes. I think:

data class Book (
 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 val id: Long? = null
)

is way easier to read than:

data class Book (
 @Id @GeneratedValue(strategy = GenerationType.IDENTITY) val id: Long? = null
)

What do you all use if anything?

I agree that the 1st is easier to read. The second makes it harder to read the field definition.

It is out of point but I think

entity class

is not suitable for

data class

. using

class

is better than

data class

because

entity class

use mutable property.

data class

use immutable property. also,

not nullable ID

is better then

nullable ID

so, I would write code like below.

data class Book (
 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 val id: Long = 0
)

If you use JPA, id will generate value automatically.

data class

 use immutable property.

@veluxer: There's nothing stopping you from using

var

instead, right?

It is up to developer. but I wouldn’t if I use data class for VO or DTO

This is sufficient for me. Activating the inspection for the formatting is quite useful. https://kotlinlang.org/docs/code-style-migration-guide.html

Thanks Michael! And also veluxer, thanks, I will do some reading on this 🙂

Seems like ktfmt or ktlint is what most people use. ktlint has a lot of flexibility but I hit issues with it all the time to work consistently. ktfmt works really well, but I can't really customize it. Personally I prefer, 0 customization and consistent code.