Add additional swift4 initializer for initializing model object with …

…properties.

This change fixes this issue: swagger-api#6641

It adds an additional initializer which allows model objects to be initialized using the properties. For exxample, if we had this model:

    "ErrorInfo": {
      "type": "object",
      "properties": {
        "code": {
          "type": "integer",
          "format": "int32"
        },
        "message": {
          "type": "string"
        },
        "details": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "description": "Example Error object"
    },

This we generate an initializer for this model object like this:

    public init(code: Int?, message: String?, details: [String]?) {
        self.code = code
        self.message = message
        self.details = details
    }

modules/swagger-codegen/src/main/resources/swift4/model.mustache

@@ -64,6 +64,12 @@ open class {{classname}}: {{#parent}}{{{parent}}}{{/parent}}{{^parent}}Codable{{
     }
 {{/additionalPropertiesType}}
 
+    public init({{#vars}}{{name}}: {{{datatypeWithEnum}}}{{^required}}?{{/required}}{{#hasMore}}, {{/hasMore}}{{/vars}}) {
+        {{#vars}}
+        self.{{name}} = {{name}}
+        {{/vars}}
+    }
+
     // Encodable protocol methods
 
     public {{#parent}}override {{/parent}}func encode(to encoder: Encoder) throws {
@@ -79,7 +85,7 @@ open class {{classname}}: {{#parent}}{{{parent}}}{{/parent}}{{^parent}}Codable{{
     }
 
     // Decodable protocol methods
-    
+
     public {{#parent}}override {{/parent}}required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/AllPrimitives.swift

@@ -38,6 +38,33 @@ open class AllPrimitives: Codable {
     public var myStringEnumArray: [StringEnum]?
 
 
+    public init(myInteger: Int?, myIntegerArray: [Int]?, myLong: Int64?, myLongArray: [Int64]?, myFloat: Float?, myFloatArray: [Float]?, myDouble: Double?, myDoubleArray: [Double]?, myString: String?, myStringArray: [String]?, myBytes: Data?, myBytesArray: [Data]?, myBoolean: Bool?, myBooleanArray: [Bool]?, myDate: Date?, myDateArray: [Date]?, myDateTime: Date?, myDateTimeArray: [Date]?, myFile: URL?, myFileArray: [URL]?, myUUID: UUID?, myUUIDArray: [UUID]?, myStringEnum: StringEnum?, myStringEnumArray: [StringEnum]?) {
+        self.myInteger = myInteger
+        self.myIntegerArray = myIntegerArray
+        self.myLong = myLong
+        self.myLongArray = myLongArray
+        self.myFloat = myFloat
+        self.myFloatArray = myFloatArray
+        self.myDouble = myDouble
+        self.myDoubleArray = myDoubleArray
+        self.myString = myString
+        self.myStringArray = myStringArray
+        self.myBytes = myBytes
+        self.myBytesArray = myBytesArray
+        self.myBoolean = myBoolean
+        self.myBooleanArray = myBooleanArray
+        self.myDate = myDate
+        self.myDateArray = myDateArray
+        self.myDateTime = myDateTime
+        self.myDateTimeArray = myDateTimeArray
+        self.myFile = myFile
+        self.myFileArray = myFileArray
+        self.myUUID = myUUID
+        self.myUUIDArray = myUUIDArray
+        self.myStringEnum = myStringEnum
+        self.myStringEnumArray = myStringEnumArray
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -71,7 +98,7 @@ open class AllPrimitives: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/ErrorInfo.swift

@@ -17,6 +17,12 @@ open class ErrorInfo: Codable {
     public var details: [String]?
 
 
+    public init(code: Int?, message: String?, details: [String]?) {
+        self.code = code
+        self.message = message
+        self.details = details
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -29,7 +35,7 @@ open class ErrorInfo: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/GetAllModelsResult.swift

@@ -17,6 +17,12 @@ open class GetAllModelsResult: Codable {
     public var myVariableNameTest: VariableNameTest?
 
 
+    public init(myPrimitiveArray: [AllPrimitives]?, myPrimitive: AllPrimitives?, myVariableNameTest: VariableNameTest?) {
+        self.myPrimitiveArray = myPrimitiveArray
+        self.myPrimitive = myPrimitive
+        self.myVariableNameTest = myVariableNameTest
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -29,7 +35,7 @@ open class GetAllModelsResult: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/ModelWithIntAdditionalPropertiesOnly.swift

@@ -28,6 +28,9 @@ open class ModelWithIntAdditionalPropertiesOnly: Codable {
         }
     }
 
+    public init() {
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -38,7 +41,7 @@ open class ModelWithIntAdditionalPropertiesOnly: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/ModelWithPropertiesAndAdditionalProperties.swift

@@ -36,6 +36,17 @@ open class ModelWithPropertiesAndAdditionalProperties: Codable {
         }
     }
 
+    public init(myIntegerReq: Int, myIntegerOpt: Int?, myPrimitiveReq: AllPrimitives, myPrimitiveOpt: AllPrimitives?, myStringArrayReq: [String], myStringArrayOpt: [String]?, myPrimitiveArrayReq: [AllPrimitives], myPrimitiveArrayOpt: [AllPrimitives]?) {
+        self.myIntegerReq = myIntegerReq
+        self.myIntegerOpt = myIntegerOpt
+        self.myPrimitiveReq = myPrimitiveReq
+        self.myPrimitiveOpt = myPrimitiveOpt
+        self.myStringArrayReq = myStringArrayReq
+        self.myStringArrayOpt = myStringArrayOpt
+        self.myPrimitiveArrayReq = myPrimitiveArrayReq
+        self.myPrimitiveArrayOpt = myPrimitiveArrayOpt
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -54,7 +65,7 @@ open class ModelWithPropertiesAndAdditionalProperties: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/ModelWithStringAdditionalPropertiesOnly.swift

@@ -28,6 +28,9 @@ open class ModelWithStringAdditionalPropertiesOnly: Codable {
         }
     }
 
+    public init() {
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -38,7 +41,7 @@ open class ModelWithStringAdditionalPropertiesOnly: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)
 

samples/client/test/swift4/default/TestClient/Classes/Swaggers/Models/VariableNameTest.swift

@@ -18,6 +18,11 @@ open class VariableNameTest: Codable {
     public var _for: String?
 
 
+    public init(exampleName: String?, _for: String?) {
+        self.exampleName = exampleName
+        self._for = _for
+    }
+
     // Encodable protocol methods
 
     public func encode(to encoder: Encoder) throws {
@@ -29,7 +34,7 @@ open class VariableNameTest: Codable {
     }
 
     // Decodable protocol methods
-    
+
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: String.self)