WebApi + ClientApp, GraphQL, Reflection

Events-WebApi/Events.WebAPI/Controllers/Generic/GetController.cs

@@ -0,0 +1,89 @@
+using AutoMapper;
+using Events.WebAPI.Contract.DTOs;
+using Events.WebAPI.Contract.Queries.Generic;
+using Events.WebAPI.Models;
+using Events.WebAPI.Util.Middleware;
+using MediatR;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Events.WebAPI.Controllers.Generic;
+
+[Authorize(Policy = nameof(Policies.ReadData))]
+[ApiController]
+[Route("[controller]")]
+[TypeFilter(typeof(BadRequestOnRuleValidationException), Order = 20)]
+[TypeFilter(typeof(ProblemDetailsForSqlException), Order = 10)]
+[TypeFilter(typeof(ProblemDetailsForException), Order = 1)] //last one
+public abstract class GetController<TDto, TPK> : ControllerBase
+   where TPK : IEquatable<TPK>
+{
+
+  /// <summary>
+  ///  Get number of item satisfying filters
+  /// </summary>
+  /// <param name="filters">Each filter is like  key(operator)value, using Sieve syntax</param>  
+  /// <param name="mediator"></param>
+  /// <param name="mapper"></param>
+  /// <returns></returns>
+  [HttpGet(nameof(Count))]
+  public virtual async Task<int> Count(string filters, [FromServices] IMediator mediator, [FromServices] IMapper mapper)
+  {
+    var countRequest = new GetCountQuery<TDto>
+    {
+      Filters = filters,    
+    };
+    int count = await mediator.Send(countRequest);
+    return count;
+  }
+
+  /// <summary>
+  /// Returns single item based on primary key value
+  /// </summary>
+  /// <param name="id"></param>
+  /// <param name="mediator"></param>
+  /// <returns></returns>
+  [HttpGet("{id}")]
+  [ProducesResponseType(StatusCodes.Status200OK)]
+  [ProducesResponseType(StatusCodes.Status404NotFound)]
+  public virtual async Task<ActionResult<TDto>> Get(TPK id, [FromServices] IMediator mediator)
+  {
+    var query = new GetSingleItemQuery<TDto, TPK>(id);
+    var item = await mediator.Send(query);
+    return item != null ?  item : Problem(statusCode: StatusCodes.Status404NotFound, detail: $"No data for id = {id}");
+  }
+
+  /// <summary>
+  ///  Get all items based on (lazy) load parameters (paging, sorting, and filtering)
+  /// </summary>
+  /// <param name="loadParams"></param>
+  /// <param name="mediator"></param>
+  /// <param name="mapper"></param>
+  /// <returns></returns>
+  [HttpGet]
+  public virtual async Task<Items<TDto>> GetAll([FromQuery] LoadParams loadParams, [FromServices] IMediator mediator, [FromServices] IMapper mapper)
+  {
+    loadParams ??= new();
+    var result = new Items<TDto>();
+    var countRequest = new GetCountQuery<TDto>
+    {
+      Filters = loadParams.Filters
+    };
+    result.Count = await mediator.Send(countRequest);
+
+    if (result.Count > 0)
+    {
+      var dataRequest = new GetItemsQuery<TDto>
+      {        
+        Filters = loadParams.Filters,
+        Sort = loadParams.Sort,
+        Page = loadParams.Page,
+        PageSize = loadParams.PageSize,
+        Ascending = loadParams.Ascending
+      };
+
+      result.Data = await mediator.Send(dataRequest);
+    }
+    return result;
+  }
+}