PropertyName

@Retention(value = RetentionPolicy.RUNTIME)
@Target(value = [ElementType.METHOD, ElementType.FIELD])
annotation PropertyName

Marks a field to be renamed when serialized.

Kotlin Note

Here is an example of a class that can both be written into and read from Firestore whose foo property will be stored into and read from a field named my_foo in the Firestore document:

data class Pojo(@get:PropertyName("my_foo") @set:PropertyName("my_foo") var foo: String? = null) {
  constructor() : this(null) // Used by Firestore to create new instances
}

If the class only needs to be written into Firestore (and not read from Firestore) then the class can be simplified as follows:

data class Pojo(@get:PropertyName("my_foo") val foo: String? = null)

Summary

abstract fun value(): String!