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

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

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

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

        // GET: api/Assignments
        [HttpGet]
        public async Task<ActionResult<IEnumerable<Assignment>>> GetAssignments()
        {
            return await _context.Assignments.ToListAsync();
        }

        // GET: api/Assignments/5
        [HttpGet("{id}")]
        public async Task<ActionResult<Assignment>> GetAssignment(long id)
        {
            var assignment = await _context.Assignments.FindAsync(id);

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

            return assignment;
        }

        // PUT: api/Assignments/5
        // To protect from overposting attacks, see https://go.microsoft.com/fwlink/?linkid=2123754
        [HttpPut("{id}")]
        public async Task<IActionResult> PutAssignment(long id, Assignment assignment)
        {
            if (id != assignment.ID)
            {
                return BadRequest();
            }

            _context.Entry(assignment).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!AssignmentExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return NoContent();
        }

        // POST: api/Assignments
        // To protect from overposting attacks, see https://go.microsoft.com/fwlink/?linkid=2123754
        [HttpPost]
        public async Task<ActionResult<Assignment>> PostAssignment(Assignment assignment)
        {
            _context.Assignments.Add(assignment);
            await _context.SaveChangesAsync();

            return CreatedAtAction("GetAssignment", new { id = assignment.ID }, assignment);
        }

        // DELETE: api/Assignments/5
        [HttpDelete("{id}")]
        public async Task<IActionResult> DeleteAssignment(long id)
        {
            var assignment = await _context.Assignments.FindAsync(id);
            if (assignment == null)
            {
                return NotFound();
            }

            _context.Assignments.Remove(assignment);
            await _context.SaveChangesAsync();

            return NoContent();
        }

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