Details

Author: jbogard

ContosoUniversity/Features/Students/Details.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+using AutoMapper.QueryableExtensions;
+using ContosoUniversity.Data;
+using ContosoUniversity.Models;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace ContosoUniversity.Features.Students
+{
+    public class Details
+    {
+        public class Query : IRequest<Model>
+        {
+            public int Id { get; set; }
+        }
+
+        public class Model
+        {
+            public int ID { get; set; }
+            [Display(Name = "First Name")]
+            public string FirstMidName { get; set; }
+            public string LastName { get; set; }
+            public DateTime EnrollmentDate { get; set; }
+            public List<Enrollment> Enrollments { get; set; }
+
+            public class Enrollment
+            {
+                public string CourseTitle { get; set; }
+                public Grade? Grade { get; set; }
+            }
+        }
+
+        public class Handler : IAsyncRequestHandler<Query, Model>
+        {
+            private readonly SchoolContext _db;
+
+            public Handler(SchoolContext db) => _db = db;
+
+            public async Task<Model> Handle(Query message) => await _db
+                .Students
+                .Include(m => m.Enrollments)
+                .ThenInclude(e => e.Course)
+                .Where(s => s.Id == message.Id)
+                .ProjectTo<Model>()
+                .SingleOrDefaultAsync();
+        }
+    }
+}

ContosoUniversity/Features/Students/Details.cshtml

@@ -1,4 +1,4 @@
-@model ContosoUniversity.Models.Student
+@model ContosoUniversity.Features.Students.Details.Model
 
 @{
     ViewData["Title"] = "Details";
@@ -11,40 +11,40 @@
     <hr />
     <dl class="dl-horizontal">
         <dt>
-            @Html.DisplayNameFor(model => model.LastName)
+            <display-label-tag for="LastName"/>
         </dt>
         <dd>
-            @Html.DisplayFor(model => model.LastName)
+            <display-tag for="LastName"/>
         </dd>
         <dt>
-            @Html.DisplayNameFor(model => model.FirstMidName)
+            <display-label-tag for="FirstMidName" />
         </dt>
         <dd>
-            @Html.DisplayFor(model => model.FirstMidName)
+            <display-tag for="FirstMidName" />
         </dd>
         <dt>
-            @Html.DisplayNameFor(model => model.EnrollmentDate)
+            <display-label-tag for="EnrollmentDate" />
         </dt>
         <dd>
-            @Html.DisplayFor(model => model.EnrollmentDate)
+            <display-tag for="EnrollmentDate" />
         </dd>
         <dt>
-            @Html.DisplayNameFor(model => model.Enrollments)
+            <display-label-tag for="Enrollments" />
         </dt>
         <dd>
             <table class="table">
                 <tr>
                     <th>Course Title</th>
                     <th>Grade</th>
                 </tr>
-                @foreach (var item in Model.Enrollments)
+                @for (var i = 0; i < Model.Enrollments.Count; i++)
                 {
                     <tr>
                         <td>
-                            @Html.DisplayFor(modelItem => item.Course.Title)
+                            <display-tag for="Enrollments[i].CourseTitle" />
                         </td>
                         <td>
-                            @Html.DisplayFor(modelItem => item.Grade)
+                            <display-tag for="Enrollments[i].Grade" />
                         </td>
                     </tr>
                 }
@@ -53,6 +53,6 @@
     </dl>
 </div>
 <div>
-    <a asp-action="Edit" asp-route-id="@Model.Id">Edit</a> |
+    <a asp-action="Edit" asp-route-id="@Model.ID">Edit</a> |
     <a asp-action="Index">Back to List</a>
 </div>

ContosoUniversity/Features/Students/MappingProfile.cs

@@ -8,8 +8,8 @@ public class MappingProfile : Profile
         public MappingProfile()
         {
             CreateMap<Student, Index.Model>();
-            //CreateMap<Student, Details.Model>();
-            //CreateMap<Enrollment, Details.Model.Enrollment>();
+            CreateMap<Student, Details.Model>();
+            CreateMap<Enrollment, Details.Model.Enrollment>();
             //CreateMap<Create.Command, Student>(MemberList.Source);
             //CreateMap<Student, Edit.Command>().ReverseMap();
             //CreateMap<Student, Delete.Command>().ReverseMap();

ContosoUniversity/Features/Students/StudentsController.cs

@@ -20,34 +20,11 @@ public StudentsController(SchoolContext context, IMediator mediator)
             _mediator = mediator;
         }
 
-        public async Task<ViewResult> Index(Index.Query query)
-        {
-            var model = await _mediator.Send(query);
-
-            return View(model);
-        }
-
-        // GET: Students/Details/5
-        public async Task<IActionResult> Details(int? id)
-        {
-            if (id == null)
-            {
-                return NotFound();
-            }
-
-            var student = await _context.Students
-                .Include(s => s.Enrollments)
-                    .ThenInclude(e => e.Course)
-                .AsNoTracking()
-                .SingleOrDefaultAsync(m => m.Id == id);
-
-            if (student == null)
-            {
-                return NotFound();
-            }
+        public async Task<ViewResult> Index(Index.Query query) 
+            => View(await _mediator.Send(query));
 
-            return View(student);
-        }
+        public async Task<IActionResult> Details(Details.Query query) 
+            => View(await _mediator.Send(query));
 
         // GET: Students/Create
         public IActionResult Create()