study-lib-backend/API/Controllers/SubjectDeleteRequestsController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using StudyLib.API.Data;
using StudyLib.API.Models;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace StudyLib.API.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class SubjectDeleteRequestsController : ControllerBase
    {
        private readonly StudyLibContext _context;

        public SubjectDeleteRequestsController(StudyLibContext context)
        {
            _context = context;
        }

        [HttpGet("list")]
        public async Task<ActionResult<IEnumerable<SubjectDeleteRequest>>> GetSubjectDeleteRequest()
        {
            return await _context.SubjectDeleteRequests.Include(s => s.Subject).ToListAsync();
        }

        [HttpPost("approveDeletion")]
        public async Task<ActionResult<SubjectDeleteRequest>> ApproveSubjectDeleteRequest(SubjectDeleteRequest deletionRequest)
        {
            var subjectDeleteRequest = await _context.SubjectDeleteRequests.Where(s => s.ID == deletionRequest.ID).Include(s => s.Subject).SingleOrDefaultAsync();

            if (subjectDeleteRequest == null)
            {
                return NotFound();
            }

            _context.Subjects.Remove(subjectDeleteRequest.Subject);
            await _context.SaveChangesAsync();

            return NoContent();
        }

        [HttpPost("addDeletionRequest")]
        public async Task<ActionResult<SubjectDeleteRequest>> AddSubjectDeleteRequest(SubjectDeleteRequest deletionRequest)
        {
            _context.SubjectDeleteRequests.Add(deletionRequest);
            await _context.SaveChangesAsync();

            return NoContent();
        }

        [HttpDelete("cancelDeletion/{id}")]
        public async Task<IActionResult> CancelSubjectDeleteRequest(long id)
        {
            var subjectDeleteRequest = await _context.SubjectDeleteRequests.FindAsync(id);
            if (subjectDeleteRequest == null)
            {
                return NotFound();
            }

            _context.SubjectDeleteRequests.Remove(subjectDeleteRequest);
            await _context.SaveChangesAsync();

            return NoContent();
        }

        private bool SubjectDeleteRequestExists(long id)
        {
            return _context.SubjectDeleteRequests.Any(e => e.ID == id);
        }
    }
}