Required or not required, that's the question.

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/Address.generated.cs

@@ -14,15 +14,15 @@ namespace PetShopBoys;
 public sealed partial record Address
 {
     [System.Text.Json.Serialization.JsonPropertyName("street")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Street { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("city")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? City { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("state")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? State { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("zip")]

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/ApiResponse.generated.cs

@@ -18,10 +18,10 @@ public sealed partial record ApiResponse
     public int Code { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("type")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Type { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("message")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Message { get; init; }
 }

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/Category.generated.cs

@@ -18,6 +18,6 @@ public sealed partial record Category
     public long Id { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("name")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Name { get; init; }
 }

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/Customer.generated.cs

@@ -18,10 +18,10 @@ public sealed partial record Customer
     public long Id { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("username")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Username { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("address")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [Qowaiv.Validation.DataAnnotations.Any]
     public PetShopBoys.Address[] Address { get; init; } = System.Array.Empty<PetShopBoys.Address>();
 }

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/Pet.generated.cs

@@ -22,15 +22,15 @@ public sealed partial record Pet
     public string? Name { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("category")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public PetShopBoys.Category? Category { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("photoUrls")]
     [Qowaiv.Validation.DataAnnotations.Any]
     public string[] PhotoUrls { get; init; } = System.Array.Empty<string>();
 
     [System.Text.Json.Serialization.JsonPropertyName("tags")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [Qowaiv.Validation.DataAnnotations.Any]
     public PetShopBoys.Tag[] Tags { get; init; } = System.Array.Empty<PetShopBoys.Tag>();
 
     /// <summary>pet status in the store</summary>

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/Tag.generated.cs

@@ -18,6 +18,6 @@ public sealed partial record Tag
     public long Id { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("name")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Name { get; init; }
 }

specs/Qowaiv.CodeGeneration.Specs/Generated/PetShopBoys/User.generated.cs

@@ -18,27 +18,27 @@ public sealed partial record User
     public long Id { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("username")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Username { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("firstName")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? FirstName { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("lastName")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? LastName { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("email")]
     [Qowaiv.Validation.DataAnnotations.Optional]
     public Qowaiv.EmailAddress Email { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("password")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Password { get; init; }
 
     [System.Text.Json.Serialization.JsonPropertyName("phone")]
-    [Qowaiv.Validation.DataAnnotations.Optional]
+    [System.ComponentModel.DataAnnotations.Required]
     public string? Phone { get; init; }
 
     /// <summary>User Status</summary>

src/Qowaiv.CodeGeneration.OpenApi/OpenApiTypeResolver.Resolve.cs

@@ -35,6 +35,9 @@ public partial class OpenApiTypeResolver
                 propertyType = AsNullable(propertyType);
             }
 
+            var isRequired = required.Contains(schema.Path.Last)
+                || (!schema.Nullable && !propertyType.IsValueType);
+
             var attributes = new List<AttributeInfo>();
             var documentation = new XmlDocumentation
             {
@@ -48,7 +51,7 @@ public partial class OpenApiTypeResolver
                 attributes,
                 documentation,
                 nullable,
-                required.Contains(schema.Path.Last));
+                isRequired);
 
             attributes.AddRange(DecorateProperty(prop, schema));
             return prop;

src/Qowaiv.CodeGeneration.OpenApi/Qowaiv.CodeGeneration.OpenApi.csproj

@@ -8,9 +8,7 @@
 
   <PropertyGroup>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <Version>0.0.1-alpha-006</Version>
-    <Version>0.0.1-alpha-005</Version>
-    <Version>0.0.1-alpha-007</Version>
+    <Version>0.0.1-alpha-008</Version>
     <PackageId>Qowaiv.CodeGeneration.OpenApi</PackageId>
     <PackageReleaseNotes>
 ToBeReleased