AspDiary/DiaryApp/Controllers/DiaryEntriesController.cs

using DiaryApp.Data;
using DiaryApp.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ModelBinding;

namespace DiaryApp.Controllers
{
    public class DiaryEntriesController : Controller
    {
        private readonly ApplicationDbContext _db;

        public DiaryEntriesController(ApplicationDbContext db) {
            _db = db;
        }
        public IActionResult Index()
        {
            List<DiaryEntry> objDiaryEntryList = _db.DiaryEntries.ToList();

            return View(objDiaryEntryList);
        }

        public IActionResult Create()
        {
            return View();
        }

        [HttpPost]
        public IActionResult Create(DiaryEntry obj)
        {
            if (obj != null && obj.Title.Length < 3)
            {
                ModelState.AddModelError("Title", "The Title must be at least 3 characters long.");
            }
            if(ModelState.IsValid)
            {
                _db.DiaryEntries.Add(obj);
                _db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(obj);
        }

        [HttpGet]
        public IActionResult Edit(int? id)
        {
            if(id== null || id == 0)
            {
                return NotFound();
            }


            DiaryEntry? diaryEntry = _db.DiaryEntries.Find(id);
            if (diaryEntry == null)
            {
                return NotFound();
            }

            return View(diaryEntry);
        }

        [HttpPost]
        public IActionResult Edit(DiaryEntry obj)
        {
            if (obj != null && obj.Title.Length < 3)
            {
                ModelState.AddModelError("Title", "The Title must be at least 3 characters long.");
            }
            if (ModelState.IsValid)
            {
                _db.DiaryEntries.Update(obj);
                _db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(obj);
        }

        [HttpGet]
        public IActionResult Delete(int? id)
        {
            if (id == null || id == 0)
            {
                return NotFound();
            }


            DiaryEntry? diaryEntry = _db.DiaryEntries.Find(id);
            if (diaryEntry == null)
            {
                return NotFound();
            }

            return View(diaryEntry);
        }

        [HttpPost]
        public IActionResult Delete(DiaryEntry obj)
        {
            _db.DiaryEntries.Remove(obj);
            _db.SaveChanges();
            return RedirectToAction("Index");
        }

    }
}