[Swift] Force required attrs to be defined with unwrapRequired

Fix #2116
Removal of forced unwrapping, replaced by required attributes in constructor

Author: fabdslv

modules/swagger-codegen/src/main/resources/swift/Models.mustache

@@ -137,9 +137,22 @@ class Decoders {
             // Decoder for {{{classname}}}
             Decoders.addDecoder(clazz: {{{classname}}}.self) { (source: AnyObject) -> {{{classname}}} in
                 let sourceDictionary = source as! [NSObject:AnyObject]
+                {{#unwrapRequired}}
+                let instance = {{classname}}({{#requiredVars}}{{^-first}}, {{/-first}}{{#isEnum}}{{name}}: {{classname}}.{{datatypeWithEnum}}(rawValue: (sourceDictionary["{{baseName}}"] as? String) ?? "")! {{/isEnum}}{{^isEnum}}{{name}}: Decoders.decode(clazz: {{{baseType}}}.self, source: sourceDictionary["{{baseName}}"]!){{/isEnum}}{{/requiredVars}})
+                {{#optionalVars}}
+                {{#isEnum}}
+                instance.{{name}} = {{classname}}.{{datatypeWithEnum}}(rawValue: (sourceDictionary["{{baseName}}"] as? String) ?? "")
+                {{/isEnum}}
+                {{^isEnum}}
+                instance.{{name}} = Decoders.decodeOptional(clazz: {{{baseType}}}.self, source: sourceDictionary["{{baseName}}"])
+                {{/isEnum}}
+                {{/optionalVars}}
+                {{/unwrapRequired}}
+                {{^unwrapRequired}}
                 let instance = {{classname}}(){{#vars}}{{#isEnum}}
-                instance.{{name}} = {{classname}}.{{datatypeWithEnum}}(rawValue: (sourceDictionary["{{baseName}}"] as? String) ?? ""){{#unwrapRequired}}{{#required}}!{{/required}}{{/unwrapRequired}} {{/isEnum}}{{^isEnum}}
-                instance.{{name}} = Decoders.decode{{^unwrapRequired}}Optional{{/unwrapRequired}}{{#unwrapRequired}}{{^required}}Optional{{/required}}{{/unwrapRequired}}(clazz: {{{baseType}}}.self, source: sourceDictionary["{{baseName}}"]{{#unwrapRequired}}{{#required}}!{{/required}}{{/unwrapRequired}}){{/isEnum}}{{/vars}}
+                instance.{{name}} = {{classname}}.{{datatypeWithEnum}}(rawValue: (sourceDictionary["{{baseName}}"] as? String) ?? "") {{/isEnum}}{{^isEnum}}
+                instance.{{name}} = Decoders.decodeOptional(clazz: {{{baseType}}}.self, source: sourceDictionary["{{baseName}}"]){{/isEnum}}{{/vars}}
+                {{/unwrapRequired}}
                 return instance
             }{{/model}}
 			{{/models}}

modules/swagger-codegen/src/main/resources/swift/model.mustache

@@ -21,15 +21,26 @@ public class {{classname}}: JSONEncodable {
 {{#vars}}
 {{#isEnum}}
     {{#description}}/** {{description}} */
-    {{/description}}public var {{name}}: {{{datatypeWithEnum}}}{{^unwrapRequired}}?{{/unwrapRequired}}{{#unwrapRequired}}{{^required}}?{{/required}}{{#required}}!{{/required}}{{/unwrapRequired}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}
+    {{/description}}public var {{name}}: {{{datatypeWithEnum}}}{{^unwrapRequired}}?{{/unwrapRequired}}{{#unwrapRequired}}{{^required}}?{{/required}}{{/unwrapRequired}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}
 {{/isEnum}}
 {{^isEnum}}
     {{#description}}/** {{description}} */
-    {{/description}}public var {{name}}: {{{datatype}}}{{^unwrapRequired}}?{{/unwrapRequired}}{{#unwrapRequired}}{{^required}}?{{/required}}{{#required}}!{{/required}}{{/unwrapRequired}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}
+    {{/description}}public var {{name}}: {{{datatype}}}{{^unwrapRequired}}?{{/unwrapRequired}}{{#unwrapRequired}}{{^required}}?{{/required}}{{/unwrapRequired}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}
 {{/isEnum}}
 {{/vars}}
 
+{{^unwrapRequired}}
     public init() {}
+{{/unwrapRequired}}
+{{#unwrapRequired}}
+    public init({{#requiredVars}}{{^-first}}, {{/-first}}{{name}}: {{#isEnum}}{{datatypeWithEnum}}!{{/isEnum}}{{^isEnum}}{{datatype}}!{{/isEnum}}{{/requiredVars}}) {
+        {{#vars}}
+        {{#requiredVars}}
+        self.{{name}} = {{name}}
+        {{/requiredVars}}
+        {{/vars}}
+    }
+{{/unwrapRequired}}
 
     // MARK: JSONEncodable
     func encodeToJSON() -> AnyObject {