diff --git a/.snapshot/all/models.ts b/.snapshot/all/models.ts
index 8766559..732690a 100644
--- a/.snapshot/all/models.ts
+++ b/.snapshot/all/models.ts
@@ -14,6 +14,7 @@ export interface ICategory {
 
 export interface IProduct {
     category: $types.TypeOrUndefinedNullable<ICategory>;
+    colors: $types.TypeOrUndefined<string[]>;
     expireDate: $types.TypeOrUndefined<string>;
     externalId: $types.TypeOrUndefinedNullable<string>;
     id: $types.TypeOrUndefined<string>;
@@ -58,10 +59,11 @@ export class Category {
 
 export class Product {
     public category: $types.TypeOrUndefinedNullable<Category> = undefined;
+    public colors: string[] = [];
     public expireDate: $types.TypeOrUndefined<Date> = undefined;
     public externalId: $types.TypeOrUndefinedNullable<Guid> = undefined;
     public id: $types.TypeOrUndefined<Guid> = undefined;
-    public modifyDates: $types.TypeOrUndefined<Date[]> = undefined;
+    public modifyDates: Date[] = [];
     public name: $types.TypeOrUndefinedNullable<string> = undefined;
     public status: $types.TypeOrUndefined<ProductStatus> = undefined;
     private __product!: string;
@@ -69,6 +71,7 @@ export class Product {
     public static toDTO(model: Partial<Product>): IProduct {
         return {
             category: model.category ? Category.toDTO(model.category) : undefined,
+            colors: model.colors,
             expireDate: toDateOut(model.expireDate),
             externalId: model.externalId ? model.externalId.toString() : null,
             id: model.id ? model.id.toString() : Guid.empty.toString(),
@@ -81,6 +84,7 @@ export class Product {
     public static fromDTO(dto: IProduct): Product {
         const model = new Product();
         model.category = dto.category ? Category.fromDTO(dto.category) : undefined;
+        model.colors = dto.colors ? dto.colors : [];
         model.expireDate = toDateIn(dto.expireDate);
         model.externalId = dto.externalId ? new Guid(dto.externalId) : null;
         model.id = new Guid(dto.id);
diff --git a/__tests__/generators/utils/TypeSerializer.spec.ts b/__tests__/generators/utils/TypeSerializer.spec.ts
index 8a27b26..ec57b97 100644
--- a/__tests__/generators/utils/TypeSerializer.spec.ts
+++ b/__tests__/generators/utils/TypeSerializer.spec.ts
@@ -6,7 +6,7 @@ describe('TypeSerializer tests', () => {
             // Arrange
             // Act
             const result = new TypeSerializer({
-                type: 'MyType'
+                type: { name: 'MyType' }
             }).toString();
 
             // Assert
@@ -17,7 +17,7 @@ describe('TypeSerializer tests', () => {
             // Arrange
             // Act
             const result = new TypeSerializer({
-                type: 'MyType',
+                type: { name: 'MyType' },
                 isOptional: false
             }).toString();
 
@@ -25,23 +25,36 @@ describe('TypeSerializer tests', () => {
             expect(result).toEqual('MyType');
         });
 
-        test('isCollection should return collection optional type', () => {
+        test('isCollection should return collection of type', () => {
             // Arrange
             // Act
             const result = new TypeSerializer({
-                type: 'MyType',
+                type: { name: 'MyType' },
                 isCollection: true
             }).toString();
 
             // Assert
-            expect(result).toEqual('$types.TypeOrUndefined<MyType[]>');
+            expect(result).toEqual('MyType[]');
+        });
+
+        test('isCollection and isOptional should return collection of type', () => {
+            // Arrange
+            // Act
+            const result = new TypeSerializer({
+                type: { name: 'MyType' },
+                isCollection: true,
+                isOptional: true
+            }).toString();
+
+            // Assert
+            expect(result).toEqual('MyType[]');
         });
 
         test('isNullable should return nullable type', () => {
             // Arrange
             // Act
             const result = new TypeSerializer({
-                type: 'MyType',
+                type: { name: 'MyType' },
                 isNullable: true
             }).toString();
 
diff --git a/package.json b/package.json
index 4781dd1..f1382b9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@luxbss/gengen",
-    "version": "1.2.1",
+    "version": "1.2.2",
     "description": "Tool for generating models and Angular services based on OpenAPIs and Swagger's JSON",
     "bin": {
         "gengen": "./bin/index.js"
diff --git a/src/generators/ModelsGenerator.ts b/src/generators/ModelsGenerator.ts
index c480481..d237733 100644
--- a/src/generators/ModelsGenerator.ts
+++ b/src/generators/ModelsGenerator.ts
@@ -20,7 +20,7 @@ import { PathBuilder } from '../services/PathBuilder';
 import { lowerFirst } from '../utils';
 import { InterfacesGenerator } from './models-generator/InterfacesGenerator';
 import { TypeSerializer } from './utils/TypeSerializer';
-import { NULL_STRING, TYPES_NAMESPACE, UNDEFINED_STRING } from './utils/consts';
+import { ARRAY_STRING, NULL_STRING, TYPES_NAMESPACE, UNDEFINED_STRING } from './utils/consts';
 
 const TO_DTO_METHOD = 'toDTO';
 const FROM_DTO_METHOD = 'fromDTO';
@@ -166,8 +166,12 @@ export class ModelsGenerator {
                     kind: StructureKind.Property,
                     scope: Scope.Public,
                     name: objectProperty.name,
-                    type: new TypeSerializer(objectProperty).toString(),
-                    initializer: UNDEFINED_STRING
+                    type: new TypeSerializer({
+                        type: { name: objectProperty.type },
+                        isNullable: objectProperty.isNullable,
+                        isCollection: objectProperty.isCollection
+                    }).toString(),
+                    initializer: objectProperty.isCollection ? ARRAY_STRING : UNDEFINED_STRING
                 })
             ),
             this.getGuardProperty(objectModel.name)
@@ -229,14 +233,14 @@ export class ModelsGenerator {
         switch (property.kind) {
             case PropertyKind.Date:
                 if (property.isCollection) {
-                    return `${dtoProperty} ? ${dtoProperty}.map(toDateIn) : []`;
+                    return `${dtoProperty} ? ${dtoProperty}.map(toDateIn) : ${ARRAY_STRING}`;
                 }
 
                 return `toDateIn(${dtoProperty})`;
 
             case PropertyKind.Guid:
                 if (property.isCollection) {
-                    return `${dtoProperty} ? ${dtoProperty}.map(x => new ${property.type}(x)) : []`;
+                    return `${dtoProperty} ? ${dtoProperty}.map(x => new ${property.type}(x)) : ${ARRAY_STRING}`;
                 }
 
                 if (property.isNullable) {
@@ -247,19 +251,24 @@ export class ModelsGenerator {
 
             case PropertyKind.Identity:
                 if (property.isCollection) {
-                    return `${dtoProperty} ? ${dtoProperty}.map(x => new ${property.type}(x.id)) : []`;
+                    return `${dtoProperty} ? ${dtoProperty}.map(x => new ${property.type}(x.id)) : ${ARRAY_STRING}`;
                 }
 
                 return `${dtoProperty} ? new ${property.type}(${dtoProperty}.id) : ${UNDEFINED_STRING}`;
 
             case PropertyKind.Object:
                 if (property.isCollection) {
-                    return `${dtoProperty} ? ${dtoProperty}.map(x => ${property.type}.${FROM_DTO_METHOD}(x)) : []`;
+                    return `${dtoProperty} ? ${dtoProperty}.map(x => ${property.type}.${FROM_DTO_METHOD}(x)) : ${ARRAY_STRING}`;
                 }
 
                 return `${dtoProperty} ? ${property.type}.${FROM_DTO_METHOD}(${dtoProperty}) : ${UNDEFINED_STRING}`;
-        }
 
-        return dtoProperty;
+            default:
+                if (property.isCollection) {
+                    return `${dtoProperty} ? ${dtoProperty} : ${ARRAY_STRING}`;
+                }
+
+                return dtoProperty;
+        }
     }
 }
diff --git a/src/generators/angular/AngularServicesMethodGenerator.ts b/src/generators/angular/AngularServicesMethodGenerator.ts
index a1dadf2..3cf9764 100644
--- a/src/generators/angular/AngularServicesMethodGenerator.ts
+++ b/src/generators/angular/AngularServicesMethodGenerator.ts
@@ -101,7 +101,7 @@ export class AngularServicesMethodGenerator {
         const typeName = `${isModel ? `${MODELS_NAMESPACE}.` : ''}${type}`;
 
         return new TypeSerializer({
-            type: typeName,
+            type: { name: typeName },
             isCollection,
             isOptional
         }).toString();
diff --git a/src/generators/utils/TypeSerializer.ts b/src/generators/utils/TypeSerializer.ts
index 110a706..0d5a3a1 100644
--- a/src/generators/utils/TypeSerializer.ts
+++ b/src/generators/utils/TypeSerializer.ts
@@ -2,11 +2,16 @@ import { IInterfacePropertyModel } from '../../models/InterfaceModel';
 import { TYPES_NAMESPACE } from './consts';
 import { typeOrUndefined } from './typeOrUndefined';
 
+interface IType {
+    name: string;
+    isInterface?: boolean;
+}
+
 interface ITypeSerializerOptions {
     isCollection?: boolean;
     isNullable?: boolean;
     isOptional?: boolean;
-    type: string;
+    type: IType;
 }
 
 export class TypeSerializer {
@@ -14,20 +19,23 @@ export class TypeSerializer {
         return new TypeSerializer({
             isCollection: param.isCollection,
             isNullable: param.isNullable,
-            type: param.dtoType
+            type: {
+                name: param.dtoType,
+                isInterface: true
+            }
         });
     }
 
     public static fromTypeName(typeName: string): TypeSerializer {
         return new TypeSerializer({
-            type: typeName
+            type: { name: typeName }
         });
     }
 
     private isCollection: boolean;
     private isNullable: boolean;
     private isOptional: boolean;
-    private type: string;
+    private type: IType;
 
     constructor(options: ITypeSerializerOptions) {
         this.isCollection = options.isCollection ?? false;
@@ -37,7 +45,12 @@ export class TypeSerializer {
     }
 
     public toString(): string {
-        const typeName = this.isCollection ? `${this.type}[]` : this.type;
+        const typeName = this.isCollection ? `${this.type.name}[]` : this.type.name;
+
+        if (this.isCollection && !this.type.isInterface) {
+            return typeName;
+        }
+
         switch (true) {
             case this.isNullable:
                 return this.typeOrUndefinedNullable(typeName);
diff --git a/src/generators/utils/consts.ts b/src/generators/utils/consts.ts
index b99b25a..37c84de 100644
--- a/src/generators/utils/consts.ts
+++ b/src/generators/utils/consts.ts
@@ -1,5 +1,6 @@
 export const NULL_STRING = `${null}`;
 export const UNDEFINED_STRING = `${undefined}`;
+export const ARRAY_STRING = '[]';
 export const MODELS_NAMESPACE = '$models';
 export const MAPPERS_NAMESPACE = '$mappers';
 export const TYPES_NAMESPACE = '$types';
\ No newline at end of file
diff --git a/swagger.json b/swagger.json
index ca95cc1..f07bd31 100644
--- a/swagger.json
+++ b/swagger.json
@@ -691,6 +691,13 @@
             },
             "nullable": true
           },
+          "colors": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "nullable": true
+          },
           "category": {
             "$ref": "#/components/schemas/Category"
           },