starting assig6

Ass6/Controllers/AuthorsController.cs

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+using Microsoft.AspNetCore.Mvc;
+using Example.Data;
+using Example.Models;
+
+namespace Example.Controllers;
+
+public class AuthorsController : Controller
+{
+    // Added private field for the application db context
+    private readonly ApplicationDbContext _db;
+    
+    // Constructor with db context as a parameter
+    public AuthorsController(ApplicationDbContext db)
+    {
+        _db = db;
+    }
+
+    // GET
+    public IActionResult Index()
+    {
+        // Fetch authors from the database
+        var authors = _db.Authors.ToList();
+        
+        // Send the list to the view. The view declares its model as @model IEnumerable<Author> to match.
+        return View(authors);
+    }
+
+    [HttpGet]
+    public IActionResult Add()
+    {
+        // Send in an empty model to the view. Required because the view must receive a model object.
+        return View(new Author());
+    }
+    
+    [HttpPost]
+    public IActionResult Add(Author author)
+    {
+        // Return the page with the current form values if the model is invalid. Allows the user to fix their mistakes.
+        if (!ModelState.IsValid)
+            return View(author);
+
+        // Add and save the new author
+        _db.Authors.Add(author);
+        _db.SaveChanges();
+        
+        // Return back to the index view (the one with the list of authors)
+        return RedirectToAction(nameof(Index));
+    }
+
+    [HttpGet]
+    public IActionResult Edit(int id)
+    {
+        // Find the existing author based on primary key
+        var author = _db.Authors.Find(id);
+
+        // Return 404 not found if the author does not exist
+        if (author == null)
+            return NotFound();
+        
+        // Reuse the add view
+        return View("Add", author);
+    }
+
+    [HttpPost]
+    public IActionResult Edit(int id, Author author)
+    {
+        // Return the page with the current form values if the model is invalid. Allows the user to fix their mistakes.
+        if (!ModelState.IsValid)
+            return View("Add", author);
+
+        _db.Authors.Update(author);
+        _db.SaveChanges();
+        
+        // Return back to the index view (the one with the list of authors)
+        return RedirectToAction(nameof(Index));
+    }
+
+    public IActionResult Delete(int id)
+    {
+        // Find the existing author based on primary key
+        var author = _db.Authors.Find(id);
+
+        // Return 404 not found if the author does not exist
+        if (author == null)
+            return NotFound();
+
+        _db.Authors.Remove(author);
+        _db.SaveChanges();
+        
+        // Return back to the index view (the one with the list of authors)
+        return RedirectToAction(nameof(Index));
+    }
+}