If so can you check if any code is generated by ka...

# arrow

[simon.vergauwen]

If so can you check if any code is generated by kapt?

[Imran/Malic]

This is what I got in my gradle file:

kotlin
plugins{
...
id("kotlin")
id("kotlin-kapt")
}
...
dependencies {
...
kapt "io.arrow-kt:arrow-meta:$arrow_version"
implementation "io.arrow-kt:arrow-optics:$arrow_version"
...
}

I am not sure If I have a running kapt plugin. I never worked with it. Did I forget anything?

[Imran/Malic]

The issue so far is that I can only use it within one depth.

kotlin
// This compiles
val john = Employee( 
 name = "John Doe", 
 company = Company("Kategory",        Address("Functional city", 
Street(44, "lamda Street"))    ))
val employeeCompany: Lens<Employee, Company>  = arrow.optics.Employee.company
// this not
val employeeStreetName: 
Lens<Employee, String> = arrow.optics.Employee.company.street.name

[Imran/Malic]

I made it work by composing the data tree — one step at a time.

kotlin
val employeeCompany =    {emp:Employee, f: (Company) -> Company ->        Employee.company.modify(emp, f)    }val companyAddress=    {c:Company, f: (Address) -> Address ->      Company.address.modify(c, f)}val addressStreet=    {ad:Address, f: (Street) -> Street ->        Address.street.modify(ad, f)}val employeeAddress =    {e:Employee, f: (Address) -> Address ->        employeeCompany(e) { c:Company -> companyAddress(c, f)}    }val employeeStreet =    {e:Employee, f: (Street) -> Street ->        employeeAddress(e){ a:Address -> addressStreet(a, f) }    }

Is there a more concise version.

[Imran/Malic]

I made it work thanks anyways. 🙂

[pakoito]

@Imran/Malic you have to annotate all of the classes for optics, it doesn’t traverse the tree

[pakoito]

hmmmm

[raulraja]

That should not be necessary

[pakoito]

your example works too, I don’t think we have the extension function version so that works 🙂

[raulraja]

The companion should have the projected lenses composed as demonstrated in the docs

[raulraja]

It's possible that Meta is not called that way unless you are in the latest snapshot

[raulraja]

Check the docs for https://0-8-2.arrow-kt.io

[raulraja]

kapt "io.arrow-ktarrow annotations processor$arrow_version"

[raulraja]

And if you are in the snapshot is called just arrow-meta

[Imran/Malic]

I am in the snapshot @raulraja. And I annotated every data class with optics which was in the tree hierarchy. Still, I could not access the values. After a few hours, Idea resolved it magically, and I could do the computations as in the docs.
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