[297]Remove implicit mapping when an explicit is present in the spec (#298)

* [297]Remove implicit mapping when an explicit is present in the spec * changelog

Author: JanC

CHANGELOG.md

@@ -9,6 +9,7 @@
 
 ### Fixed
 - Fixed compilation with Xcode 13 #282 @sroebert
+- Fixed duplicated switch cases when using explicit mappings in oneOf discriminator #297 @JanC
 
 ### Changed
 - Improved `CodeFormatter` efficiency #272 @zntfdr

Sources/SwagGenKit/CodeFormatter.swift

@@ -213,6 +213,7 @@ public class CodeFormatter {
 for (key, value) in discriminatorMapping {
 // TODO: could reference another spec
 let reference = Reference<Schema>(value)
+mapping.removeValue(forKey: reference.name)
 mapping[key] = getReferenceContext(reference)
 }
 }

Specs/TestSpec/generated/Swift/Sources/Models/SingleAnimal.swift

@@ -13,10 +13,6 @@ public enum SingleAnimal: Codable, Equatable {
 let container = try decoder.container(keyedBy: StringCodingKey.self)
 let discriminator: String = try container.decode("type")
 switch discriminator {
-case "Cat":
-self = .cat(try Cat(from: decoder))
-case "Dog":
-self = .dog(try Dog(from: decoder))
 case "cat":
 self = .cat(try Cat(from: decoder))
 case "dog":