Shows how we can map a network response object to a UI model & manually check for required fields.

Patient.kt

data class PatientDTO(
    @field:Json(name = "id")
    val id: String? = null,
    @field:Json(name = "firstName")
    val firstName: String? = null,
    @field:Json(name = "lastName")
    val lastName: String? = null
) {
    fun toPatient(): Patient {
        val id = this.id.orEmpty()
        val firstName = this.firstName.orEmpty()
        val lastName = this.lastName.orEmpty()

        if (id.isNotEmpty() && firstName.isNotEmpty() && lastName.isNotEmpty()) {
            return Patient(
                id = id,
                firstName = firstName,
                lastName = lastName
            )
        } else {
            throw InvalidJSONResponseError(this::class)
        }
    }
}