public async Task <IActionResult> PutCanvasUser([FromRoute] int id, [FromBody] CanvasUser canvasUser)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            if (id != canvasUser.Id)
            {
                return(BadRequest());
            }

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

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

            return(NoContent());
        }
        public async Task <IActionResult> PostCanvasUser([FromBody] CanvasUser canvasUser)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            _context.CanvasUser.Add(canvasUser);
            await _context.SaveChangesAsync();

            return(CreatedAtAction("GetCanvasUser", new { id = canvasUser.Id }, canvasUser));
        }
        //[HttpDelete("{id}")]
        public async Task <IActionResult> DeleteCanvasUser([FromBody] CanvasUser canvasUser)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            var canvasUser1 = await _context.CanvasUser.SingleOrDefaultAsync(m => m.CanvasId == canvasUser.CanvasId && m.UserId == canvasUser.UserId);

            if (canvasUser1 == null)
            {
                return(NotFound());
            }

            _context.CanvasUser.Remove(canvasUser1);
            await _context.SaveChangesAsync();

            return(Ok(canvasUser));
        }