update decodearray and encodearray method

MVMCore/MVMCore/Models/Model/ModelRegistry.swift

@@ -104,8 +104,31 @@ extension KeyedDecodingContainer where Key: CodingKey {
     }
     
     public func decodeArray<C:CodingKey>(codingKey: KeyedDecodingContainer<K>.Key, typeCodingKey: C) throws -> [Model] {
-        guard let models: [Model] = try decodeArrayIfPresent(codingKey: codingKey, typeCodingKey: typeCodingKey) else {
+        var unkeyedContainer: UnkeyedDecodingContainer?
-            return [Model]()
+        do {
+            unkeyedContainer = try nestedUnkeyedContainer(forKey: codingKey)
+        } catch {
+            throw ModelRegistry.Error.decoderErrorObjectNotPresent
+        }
+        var otherUnkeyedContainer = try nestedUnkeyedContainer(forKey: codingKey)
+        var attributes = [Model.Type]()
+        while !unkeyedContainer!.isAtEnd {
+            let meta = try unkeyedContainer!.nestedContainer(keyedBy: C.self)
+            let type = try meta.decode(String.self, forKey: typeCodingKey)
+            //get the type
+            guard let found = ModelRegistry.types[type] else {
+                throw ModelRegistry.Error.decoderErrorModelNotMapped
+            }
+            attributes.append(found)
+        }
+        var i = 0
+        var models = [Model]()
+        while !otherUnkeyedContainer.isAtEnd {
+            let foundModel = attributes[i]
+            if let model = try foundModel.mvmdecode(unkeyedContainer: &otherUnkeyedContainer) {
+                models.append(model)
+            }
+            i += 1
         }
         return models
     }
@@ -138,6 +161,10 @@ extension KeyedEncodingContainer where Key: CodingKey {
     
     public mutating func encodeArrayIfPresent(_ list:[Model]?, forKey key:KeyedEncodingContainer<K>.Key) throws {
         guard let models = list else { return }
-        try self.encodeArray(models, forKey: key)
+        do {
+            try self.encodeArray(models, forKey: key)
+        } catch {
+            return
+        }
     }
 }