public async Task<object> Update<T>(int id, T request) where T : Request
        {
            var filter = Builders<T>.Filter.Where(e => e.Id == (object)id);
            var updateValues = new List<UpdateDefinition<T>>();
            for (var index = 0; index < typeof(Purchase).GetProperties().Length; index++)
            {
                var prop = typeof(Purchase).GetProperties()[index];
                var value = prop.GetValue(request);
                if (value != null)
                {
                    updateValues.Add(Builders<T>.Update.Set(prop.Name, value));
                }
            }

            var update = Builders<T>.Update.Combine(updateValues);
            await _dbContext.Database.GetCollection<T>("requests").UpdateOneAsync(filter, update);
            return request;
        }

        [HttpPut("{id:int}")]
        public IActionResult Update(int id, [FromBody] Purchase purchase)
        {
            var task = _requestRepository.Update(id, purchase);
            return new ObjectResult(task.Result);
        }

        [HttpPut("{id:int}")]
        public IActionResult Update(int id, [FromBody] Purchase purchase)
        {
            var task = _requestRepository.Update(id, purchase);
            return new ObjectResult(task.Result);
        }