Adding server-side paging for categories

Author: zdrawku

NorthwindCRUD/Controllers/CategoriesController.cs

@@ -13,13 +13,15 @@ public class CategoriesController : ControllerBase
     {
         private readonly CategoryService categoryService;
         private readonly ProductService productService;
+        private readonly PagingService pagingService;
         private readonly IMapper mapper;
         private readonly ILogger<CategoriesController> logger;
 
-        public CategoriesController(CategoryService categoryService, ProductService productService, IMapper mapper, ILogger<CategoriesController> logger)
+        public CategoriesController(CategoryService categoryService, ProductService productService, PagingService pagingService, IMapper mapper, ILogger<CategoriesController> logger)
         {
             this.categoryService = categoryService;
             this.productService = productService;
+            this.pagingService = pagingService;
             this.mapper = mapper;
             this.logger = logger;
         }
@@ -39,6 +41,33 @@ public ActionResult<CategoryDto[]> GetAll()
             }
         }
 
+        /// <summary>
+        /// Fetches all categories or a page of categories based on the provided parameters.
+        /// </summary>
+        /// <param name="skip">The number of records to skip before starting to fetch the categories. If this parameter is not provided, fetching starts from the beginning.</param>
+        /// <param name="top">The maximum number of categories to fetch. If this parameter is not provided, all categories are fetched.</param>
+        /// <param name="orderBy">A comma-separated list of fields to order the categories by, along with the sort direction (e.g., "field1 asc, field2 desc").</param>
+        /// <returns>A PagedResultDto object containing the fetched T and the total record count.</returns>
+        [HttpGet("GetPagedCategories")]
+        public ActionResult<PagedResultDto<ProductDto>> GetPagedCategories(int? skip, int? top, string? orderBy)
+        {
+            try
+            {
+                // Retrieve all categories
+                var categories = this.categoryService.GetAll();
+
+                // Get paged data
+                var pagedResult = pagingService.GetPagedData<CategoryDb, CategoryDto>(categories, skip, top, orderBy);
+
+                return Ok(pagedResult);
+            }
+            catch (Exception error)
+            {
+                logger.LogError(error.Message);
+                return StatusCode(500);
+            }
+        }
+
         [HttpGet("{id}")]
         public ActionResult<CategoryDto> GetById(int id)
         {