In Kotlin, how do you refer to a variable from outside a scoping function when it has the same name as a field in the lambda receiver

user_2765615 0
Viewed 450

In Kotlin, using a scope function such as "with" that allows the this reference inside the block to reference the lambda result, is it possible to reference the outer class member when it has the same name as one of the fields in the result?

eg

data class Person(name: String)
...
class MyClass {
    var name = ""

    with(personRepository.getPerson(personId)) {
        // How do we set the class "name" member - "this.name" or just "name" refers to the scoped object?
        name = this.name // ???
    }

Obviously using a different variable name is the simple workaround but just wondering if there is a syntax for when the variables have the same name

class MyClass {
    var personName = ""
...
    with(personRepository.getPerson(personId)) {
        personName = this.name
    }
kotlin android
3 Answers

the this refers to the object that you pass. In order for you to refer to the context of your class you would need to use labels like below. Do note that this is an anti pattern. With scoping functions you would only want to apply logic on the object that you are passing or that is the receiver object in scoping functions like let and apply

class MyClass {
    var name: String = ""
    val person = Person("my name")

    fun setName() = with(person) {
       this@MyClass.name = person.name 
    }
}
user_86365650

I would suggest using let{} instead of with{}:

data class Person(name: String)
...
class MyClass {
    var name = ""

    personRepository.getPerson(personId).let {
    name = it.name
}
user_34668080

You can use a labeled this to refer to the variable in MyClass. Like this:

with(personRepository.getPerson(personId)) {
    this@MyClass.name = name
}
user_41374890
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