diff --git a/AndDietCokeProject/AndDietCokeBuisnessLogic/Implementations/PostBuisnessLogicContract.cs b/AndDietCokeProject/AndDietCokeBuisnessLogic/Implementations/PostBuisnessLogicContract.cs
index c0190ac..5b60e8a 100644
--- a/AndDietCokeProject/AndDietCokeBuisnessLogic/Implementations/PostBuisnessLogicContract.cs
+++ b/AndDietCokeProject/AndDietCokeBuisnessLogic/Implementations/PostBuisnessLogicContract.cs
@@ -26,7 +26,7 @@ internal class PostBuisnessLogicContract(IPostStorageContract postStorageContrac
     }
     public PostDataModel GetPostByData(string data)
     {
-        return new("", "", "", PostType.None, 0, true, DateTime.UtcNow);
+        return new("", "", PostType.None, 0, true, DateTime.UtcNow);
     }
     public void InsertPost(PostDataModel postDataModel)
     {
diff --git a/AndDietCokeProject/AndDietCokeProject/DataModels/PostDataModel.cs b/AndDietCokeProject/AndDietCokeProject/DataModels/PostDataModel.cs
index c1892f9..c313dc7 100644
--- a/AndDietCokeProject/AndDietCokeProject/DataModels/PostDataModel.cs
+++ b/AndDietCokeProject/AndDietCokeProject/DataModels/PostDataModel.cs
@@ -11,7 +11,7 @@ using System.Xml;
 
 namespace AndDietCokeContracts.DataModels;
 
-public class PostDataModel(string id, string postId, string postName, PostType
+public class PostDataModel(string id, string postName, PostType
 postType, double salary, bool isActual, DateTime changeDate) : IValidation
 {
     public string Id { get; private set; } = id;
diff --git a/AndDietCokeProject/AndDietCokeTests/AndDietCokeTests.csproj b/AndDietCokeProject/AndDietCokeTests/AndDietCokeTests.csproj
index 739072c..4558492 100644
--- a/AndDietCokeProject/AndDietCokeTests/AndDietCokeTests.csproj
+++ b/AndDietCokeProject/AndDietCokeTests/AndDietCokeTests.csproj
@@ -7,6 +7,7 @@
 
     <IsPackable>false</IsPackable>
     <IsTestProject>true</IsTestProject>
+    <LangVersion>preview</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/AndDietCokeProject/AndDietCokeTests/DataModelsTests/PostDataModelTests.cs b/AndDietCokeProject/AndDietCokeTests/DataModelsTests/PostDataModelTests.cs
index 7b094dd..58e746e 100644
--- a/AndDietCokeProject/AndDietCokeTests/DataModelsTests/PostDataModelTests.cs
+++ b/AndDietCokeProject/AndDietCokeTests/DataModelsTests/PostDataModelTests.cs
@@ -16,51 +16,51 @@ internal class PostDataModelTests
     [Test]
     public void IdIsNullOrEmptyTest()
     {
-        var post = CreateDataModel("0", Guid.NewGuid().ToString(), "name", PostType.Waiter, 10, true, DateTime.UtcNow);
+        var post = CreateDataModel("0", "name", PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
-        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), "name", PostType.Waiter, 10, true, DateTime.UtcNow);
+        post = CreateDataModel(string.Empty, "name", PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
     public void IdIsNotGuidTest()
     {
-        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name", PostType.Waiter, 10, true, DateTime.UtcNow);
+        var post = CreateDataModel("id", "name", PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
     public void PostIdIsNullEmptyTest()
     {
-        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name", PostType.Waiter, 10, true, DateTime.UtcNow);
+        var post = CreateDataModel("0", "name", PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
-        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "name", PostType.Waiter, 10, true, DateTime.UtcNow);
+        post = CreateDataModel("0", "name", PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
     public void PostIdIsNotGuidTest()
     {
-        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId", "name", PostType.Waiter, 10, true, DateTime.UtcNow);
+        var post = CreateDataModel("0", "name", PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
     public void PostNameIsEmptyTest()
     {
-        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, PostType.Waiter, 10, true, DateTime.UtcNow);
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), null, PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
-        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), string.Empty, PostType.Waiter, 10, true, DateTime.UtcNow);
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, PostType.Waiter, 10, true, DateTime.UtcNow);
         Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
     public void PostTypeIsNoneTest()
     {
-        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.None, 10, true, DateTime.UtcNow);
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "name", PostType.None, 10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
     public void SalaryIsLessOrZeroTest()
     {
-        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.Waiter, 0, true, DateTime.UtcNow);
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "name", PostType.Waiter, 0, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
-        post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.Waiter, -10, true, DateTime.UtcNow);
+        post = CreateDataModel(Guid.NewGuid().ToString(), "name", PostType.Waiter, -10, true, DateTime.UtcNow);
         Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
     }
     [Test]
@@ -73,7 +73,7 @@ internal class PostDataModelTests
         var salary = 10;
         var isActual = false;
         var changeDate = DateTime.UtcNow.AddDays(-1);
-        var post = CreateDataModel(postId, postPostId, postName, postType, salary, isActual, changeDate);
+        var post = CreateDataModel(postId, postName, postType, salary, isActual, changeDate);
         Assert.That(() => post.Validate(), Throws.Nothing);
         Assert.Multiple(() =>
         {
@@ -83,7 +83,7 @@ internal class PostDataModelTests
             Assert.That(post.Salary, Is.EqualTo(salary));
         });
     }
-    private static PostDataModel CreateDataModel(string? id, string? postId, string? postName, PostType postType, double salary, bool isActual, DateTime changeDate) => new(id, postId, postName, postType, salary, isActual, changeDate);
+    private static PostDataModel CreateDataModel(string? id, string? postName, PostType postType, double salary, bool isActual, DateTime changeDate) => new(id, postName, postType, salary, isActual, changeDate);
 }