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programming_books_eng

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to get the current user in the Index action:
public async Task<IActionResult> Index()
79
Using identity in the application
{
var currentUser = await _userManager.GetUserAsync(User);
if (currentUser == null) return Challenge();
var items = await _todoItemService
.GetIncompleteItemsAsync(currentUser);
var model = new TodoViewModel()
{
Items = items
};
return View(model);
}
The new code at the top of the action method uses the UserManager to
look up the current user from the User property available in the action:
var currentUser = await _userManager.GetUserAsync(User);
If there is a logged-in user, the User property contains a lightweight
object with some (but not all) of the user's information. The UserManager
uses this to look up the full user details in the database via the
GetUserAsync() method.
The value of currentUser should never be null, because the
[Authorize] attribute is present on the controller. However, it's a good
idea to do a sanity check, just in case. You can use the Challenge()
method to force the user to log in again if their information is missing:
if (currentUser == null) return Challenge();
Since you're now passing an ApplicationUser parameter to
GetIncompleteItemsAsync() , you'll need to update the ITodoItemService
interface:
Services/ITodoItemService.cs
80
Using identity in the application
public interface ITodoItemService
{
Task<TodoItem[]> GetIncompleteItemsAsync(
ApplicationUser user);
// ...
}
Since you changed the ITodoItemService interface, you also need to
update the signature of the GetIncompleteItemsAsync() method in the
TodoItemService :
Services/TodoItemService
public async Task<TodoItem[]> GetIncompleteItemsAsync(
ApplicationUser user)
The next step is to update the database query and add a filter to show
only the items created by the current user. Before you can do that, you
need to add a new property to the database.
Update the database
You'll need to add a new property to the TodoItem entity model so each