JPHD-2021-backend/Pages/Submissions/Delete.cshtml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using _2021_backend.Data;
using _2021_backend.Models;

namespace _2021_backend.Pages.Submissions
{
    public class DeleteModel : PageModel
    {
        private readonly _2021_backend.Data.BackendContext Context;

        public DeleteModel(_2021_backend.Data.BackendContext context)
        {
            Context = context;
        }

        [BindProperty]
        public Submission Submission { get; set; }

        public async Task<IActionResult> OnGetAsync(string? strid)
        {
            Guid id = Guid.Parse(strid);
            if (id == null)
            {
                return NotFound();
            }
            Submission = Context.Submissions.FirstOrDefault(m => m.Guid == id);
            
            if (Submission == null)
            {
                return NotFound();
            }
            return Page();
        }

        public async Task<IActionResult> OnPostAsync(Guid? id)
        {
            if (id == null)
            {
                return NotFound();
            }
            Submission = Context.Submissions.Find(id);
            
            if (Submission != null)
            {
                var stu = Context.Students.Find(Submission.Host);
                if (stu != null)
                {
                    stu.Submissions.Remove(Submission.Guid);
                }   
                Context.Submissions.Remove(Submission);
                Context.SaveChanges();
            }

            return RedirectToPage("./Index");
        }
    }
}