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Commit 0915cfc

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Add OpenAPI support for custom JSON:API action methods
Moves success/error status codes into metadata to support custom JSON:API action methods. Refactored internal type hierarchy: [Before] OpenApiActionMethod CustomControllerActionMethod BuiltinJsonApiActionMethod { ControllerType } AtomicOperationsActionMethod JsonApiActionMethod { Endpoint } [After] JsonApiActionMethod { ControllerType } OperationsActionMethod ResourceActionMethod BuiltinResourceActionMethod { Endpoint } CustomResourceActionMethod { Descriptor }
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‎docs/usage/extensibility/controllers.md

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@@ -137,3 +137,56 @@ public class ReportsController : JsonApiController<Report, int>
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```
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For more information about resource service injection, see [Replacing injected services](~/usage/extensibility/layer-overview.md#replacing-injected-services) and [Resource Services](~/usage/extensibility/services.md).
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## Custom action methods
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Aside from adding custom ASP.NET controllers and Minimal API endpoints to your project that are unrelated to JSON:API,
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you can also augment JsonApiDotNetCore controllers with custom action methods.
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This applies to both auto-generated and explicit controllers.
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When doing so, they participate in the JsonApiDotNetCore pipeline, which means that JSON:API query string parameters are available,
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exceptions are handled, and the request/response bodies match the JSON:API structure. As a result, the following restrictions apply:
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- The input/output resource types used must exist in the resource graph.
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- For primary endpoints, the input/output resource types must match the controller resource type.
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- An action method can only return a resource, a collection of resources, an error, or null.
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For example, the following custom POST endpoint doesn't take a request body and returns a collection of resources:
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```c#
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partial class TagsController
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{
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// POST /tags/defaults
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[HttpPost("defaults")]
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public async Task<IActionResult> CreateDefaultTagsAsync()
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{
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List<string> defaultTagNames =
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[
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"Create design",
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"Implement feature",
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"Write tests",
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"Update documentation",
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"Deploy changes"
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];
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bool hasDefaultTags = await _appDbContext.Tags.AnyAsync(tag => defaultTagNames.Contains(tag.Name));
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if (hasDefaultTags)
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{
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throw new JsonApiException(new ErrorObject(HttpStatusCode.Conflict)
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{
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Title = "Default tags already exist."
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});
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}
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List<Tag> defaultTags = defaultTagNames.Select(name => new Tag
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{
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Name = name
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}).ToList();
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_appDbContext.Tags.AddRange(defaultTags);
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await _appDbContext.SaveChangesAsync();
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return Ok(defaultTags);
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}
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}
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```

‎docs/usage/openapi.md

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By default, the OpenAPI document will be available at `http://localhost:<port>/swagger/v1/swagger.json`.
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> [!TIP]
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> In addition to the documentation here, various examples can be found in the [OpenApiTests project](https://github.com/json-api-dotnet/JsonApiDotNetCore/tree/master/test/OpenApiTests).
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### Customizing the Route Template
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Because Swashbuckle doesn't properly implement the ASP.NET Options pattern, you must *not* use its
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[documented way](https://github.com/domaindrivendev/Swashbuckle.AspNetCore?tab=readme-ov-file#change-the-path-for-swagger-json-endpoints)
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[documented way](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/blob/master/docs/configure-and-customize-swagger.md#change-the-path-for-swagger-json-endpoints)
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to change the route template:
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```c#
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</PropertyGroup>
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```
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You can combine this with the documentation that Swagger itself supports, by enabling it as described
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[here](https://github.com/domaindrivendev/Swashbuckle.AspNetCore#include-descriptions-from-xml-comments).
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You can combine this with the documentation that Swashbuckle itself supports, by enabling it as described
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[here](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/blob/master/docs/configure-and-customize-swaggergen.md#include-descriptions-from-xml-comments).
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This adds documentation for additional types, such as triple-slash comments on enums used in your resource models.
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## Custom JSON:API action methods
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To express the metadata of [custom action methods](~/usage/extensibility/controllers.md#custom-action-methods) in OpenAPI,
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use the following attributes on your controller action method:
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- The `Name` property on `HttpMethodAttribute` to specify the OpenAPI operation ID, for example:
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```c#
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[HttpGet("active", Name = "get-active-users")]
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```
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- `EndpointDescriptionAttribute` to specify the OpenAPI endpoint description, for example:
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```c#
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[EndpointDescription("Provides access to user accounts.")]
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```
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- `ConsumesAttribute` to specify the resource type of the request body, for example:
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```c#
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[Consumes(typeof(UserAccount), "application/vnd.api+json")]
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```
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> [!NOTE]
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> The `contentType` parameter is required, but effectively ignored.
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- `ProducesResponseTypeAttribute` attribute(s) to specify the response types and status codes, for example:
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```c#
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[ProducesResponseType<ICollection<UserAccount>>(StatusCodes.Status200OK)]
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[ProducesResponseType(StatusCodes.Status204NoContent)]
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[ProducesResponseType(StatusCodes.Status404NotFound)]
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[ProducesResponseType(StatusCodes.Status409Conflict)]
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```
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> [!NOTE]
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> For non-success response status codes, the type should be omitted.
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Custom parameters on action methods can be decorated with the usual attributes, such as `[Required]`, `[Description]`, etc.

‎src/JsonApiDotNetCore.OpenApi.Swashbuckle/ActionDescriptorExtensions.cs

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internal static class ActionDescriptorExtensions
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{
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public static MethodInfoGetActionMethod(this ActionDescriptor descriptor)
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public static MethodInfo?TryGetActionMethod(this ActionDescriptor descriptor)
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{
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ArgumentNullException.ThrowIfNull(descriptor);
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return controllerActionDescriptor.MethodInfo;
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}
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MethodInfo? methodInfo = descriptor.EndpointMetadata.OfType<MethodInfo>().FirstOrDefault();
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ConsistencyGuard.ThrowIf(methodInfo == null);
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return methodInfo;
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return descriptor.EndpointMetadata.OfType<MethodInfo>().FirstOrDefault();
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}
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public static ControllerParameterDescriptor? GetBodyParameterDescriptor(this ActionDescriptor descriptor)

‎src/JsonApiDotNetCore.OpenApi.Swashbuckle/ConfigureSwaggerGenOptions.cs

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@@ -146,17 +146,17 @@ private static void IncludeDerivedTypes(ResourceType baseType, List<Type> clrTyp
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private static IList<string> GetOpenApiOperationTags(ApiDescription description, IControllerResourceMapping controllerResourceMapping)
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{
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var actionMethod = OpenApiActionMethod.Create(description.ActionDescriptor);
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var actionMethod = JsonApiActionMethod.TryCreate(description.ActionDescriptor);
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switch (actionMethod)
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{
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case AtomicOperationsActionMethod:
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case OperationsActionMethod:
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{
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return ["operations"];
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}
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case JsonApiActionMethodjsonApiActionMethod:
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case ResourceActionMethodresourceActionMethod:
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{
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ResourceType? resourceType = controllerResourceMapping.GetResourceTypeForController(jsonApiActionMethod.ControllerType);
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ResourceType? resourceType = controllerResourceMapping.GetResourceTypeForController(resourceActionMethod.ControllerType);
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ConsistencyGuard.ThrowIf(resourceType == null);
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return [resourceType.PublicName];

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