public IHttpActionResult PostMonthlyTotal(MonthlyTotal monthlyTotal)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            //Ensure that absolute value has been calculated
            monthlyTotal.Absolute_Quantity_Sold = MonthlyTotal.RemoveSeasonality(monthlyTotal.Quantity_Sold, monthlyTotal.Date.Month);
            db.MonthlyTotals.Add(monthlyTotal);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateException)
            {
                if (MonthlyTotalExists(monthlyTotal.SKU))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = monthlyTotal.SKU }, monthlyTotal);
        }
        public IHttpActionResult PutMonthlyTotal(int id, MonthlyTotal monthlyTotal)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != monthlyTotal.SKU)
            {
                return BadRequest();
            }

            db.Entry(monthlyTotal).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!MonthlyTotalExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }