Hi all, I'm trying to introduce Optics to an existing Android project [...]

# arrow

[ivanmorgillo]

Hi all, I'm trying to introduce Optics to an existing Android project [...]

[ivanmorgillo]

I went through the usual setup:
I added kapt, I added the dependencies:

implementation(platform("io.arrow-kt:arrow-stack:1.0.1"))
    implementation("io.arrow-kt:arrow-core")
    implementation("io.arrow-kt:arrow-optics")

[ivanmorgillo]

I added the classes:

@optics
sealed class ContactInformation {
    companion object {}

    data class Email(val value: String) : ContactInformation()

    @optics
    sealed class Phone : ContactInformation() {
        companion object {}

        @optics
        data class MobilePhone(val number: String) : Phone() { companion object }

        @optics
        data class OfficePhone(val number: String) : Phone() { companion object }

        @optics
        data class HomePhone(val number: String) : Phone() { companion object }
    }

    data class HomeAddress(val street: String) : ContactInformation()
    object Pigeon : ContactInformation()
}

@optics
data class UserProfile(val name: String, val contact: ContactInformation) { companion object }

[ivanmorgillo]

I should be able to do this now right?

UserProfile.contact.phone.modify(joe) { MobilePhone("1234567890") }

[ivanmorgillo]

I'm afraid the code generation does not happen 😞

[ivanmorgillo]

am I missing something?

[Luke]

try adding kapt "io.arrow-kt:arrow-meta:<version>", it worked for me

[Luke]

kapt "io.arrow-kt:arrow-meta" will work with arrow-stack I guess

[stojan]

Yup, Optics still needs kapt and the arrow-meta dependency included

https://arrow-kt.io/docs/optics/#basic-setup

[ivanmorgillo]

ok, if I add this

implementation("io.arrow-kt:arrow-optics:1.0.1")
    kapt("io.arrow-kt:arrow-meta:1.0.1")

it works 👍

this instead

implementation(platform("io.arrow-kt:arrow-stack:1.0.1"))
implementation("io.arrow-kt:arrow-core")
implementation("io.arrow-kt:arrow-optics")

is not enough 👎

[ivanmorgillo]

the documentation is a bit misleading tho

[ivanmorgillo]

thanks @Luke @stojan

[Ties]

I got it working under maven 🙂 also don't forget to call assemble to actually generate the code