examples : Refactor properties to use 'required' instead of nullable with null default

Author: niteshsinghal85

src/Examples/DapperExample/Models/AccountRecovery.cs

@@ -15,5 +15,5 @@ public sealed class AccountRecovery : Identifiable<long>
     public string? EmailAddress { get; set; }
 
     [HasOne]
-    public LoginAccount Account { get; set; } = null!;
+    public required LoginAccount Account { get; set; }
 }

src/Examples/DapperExample/Models/LoginAccount.cs

@@ -9,13 +9,13 @@ namespace DapperExample.Models;
 public sealed class LoginAccount : Identifiable<long>
 {
     [Attr]
-    public string UserName { get; set; } = null!;
+    public required string UserName { get; set; }
 
     public DateTimeOffset? LastUsedAt { get; set; }
 
     [HasOne]
-    public AccountRecovery Recovery { get; set; } = null!;
+    public required AccountRecovery Recovery { get; set; }
 
     [HasOne]
-    public Person Person { get; set; } = null!;
+    public required Person Person { get; set; }
 }

src/Examples/DapperExample/Models/Person.cs

@@ -13,7 +13,7 @@ public sealed class Person : Identifiable<long>
     public string? FirstName { get; set; }
 
     [Attr]
-    public string LastName { get; set; } = null!;
+    public required string LastName { get; set; }
 
     // Mistakenly includes AllowFilter, so we can test for the error produced.
     [Attr(Capabilities = AttrCapabilities.AllowView | AttrCapabilities.AllowFilter)]

src/Examples/DapperExample/Models/RgbColor.cs

@@ -19,7 +19,7 @@ public override int? Id
     }
 
     [HasOne]
-    public Tag Tag { get; set; } = null!;
+    public required Tag Tag { get; set; }
 
     [Attr(Capabilities = AttrCapabilities.AllowView)]
     [NotMapped]

src/Examples/DapperExample/Models/Tag.cs

@@ -11,7 +11,7 @@ public sealed class Tag : Identifiable<long>
 {
     [Attr]
     [MinLength(1)]
-    public string Name { get; set; } = null!;
+    public required string Name { get; set; }
 
     [HasOne]
     public RgbColor? Color { get; set; }

src/Examples/DapperExample/Models/TodoItem.cs

@@ -10,7 +10,7 @@ namespace DapperExample.Models;
 public sealed class TodoItem : Identifiable<long>
 {
     [Attr]
-    public string Description { get; set; } = null!;
+    public required string Description { get; set; }
 
     [Attr]
     [Required]
@@ -26,7 +26,7 @@ public sealed class TodoItem : Identifiable<long>
     public DateTimeOffset? LastModifiedAt { get; set; }
 
     [HasOne]
-    public Person Owner { get; set; } = null!;
+    public required Person Owner { get; set; }
 
     [HasOne]
     public Person? Assignee { get; set; }

src/Examples/DatabasePerTenantExample/Models/Employee.cs

@@ -9,11 +9,11 @@ namespace DatabasePerTenantExample.Models;
 public sealed class Employee : Identifiable<Guid>
 {
     [Attr]
-    public string FirstName { get; set; } = null!;
+    public required string FirstName { get; set; }
 
     [Attr]
-    public string LastName { get; set; } = null!;
+    public required string LastName { get; set; }
 
     [Attr]
-    public string CompanyName { get; set; } = null!;
+    public required string CompanyName { get; set; }
 }

src/Examples/GettingStarted/Models/Book.cs

@@ -9,11 +9,11 @@ namespace GettingStarted.Models;
 public sealed class Book : Identifiable<long>
 {
     [Attr]
-    public string Title { get; set; } = null!;
+    public required string Title { get; set; }
 
     [Attr]
     public int PublishYear { get; set; }
 
     [HasOne]
-    public Person Author { get; set; } = null!;
+    public required Person Author { get; set; }
 }

src/Examples/GettingStarted/Models/Person.cs

@@ -9,7 +9,7 @@ namespace GettingStarted.Models;
 public sealed class Person : Identifiable<long>
 {
     [Attr]
-    public string Name { get; set; } = null!;
+    public required string Name { get; set; }
 
     [HasMany]
     public ICollection<Book> Books { get; set; } = new List<Book>();

src/Examples/JsonApiDotNetCoreExample/Models/Person.cs

@@ -13,7 +13,7 @@ public sealed class Person : Identifiable<long>
     public string? FirstName { get; set; }
 
     [Attr]
-    public string LastName { get; set; } = null!;
+    public required string LastName { get; set; }
 
     [Attr(Capabilities = AttrCapabilities.AllowView)]
     [NotMapped]