/// <summary>
        /// Izvoz master-detail podataka o osobama u Excel
        /// </summary>
        /// <returns>Excel datoteka sa master-detail podacima</returns>
        public IActionResult OsobeMasterDetailExcel()
        {
            var people = _context.Person.Select(p => new
            {
                Id = p.Id,
                FirstName = p.FirstName.Trim(),
                LastName = p.LastName.Trim(),
                Oib = p.Oib.Trim(),
                Contents = _context.Content.Select(c => new
                {
                    Name = c.Name.Trim(),
                    Description = c.Description.Trim(),
                    Link = c.Link.Trim(),
                    IdCreator = c.IdCreator
                }).Where(c => c.IdCreator == p.Id).ToList()
            }).ToList();

            byte[] content;
            using (ExcelPackage excel = new ExcelPackage())
            {
                excel.Workbook.Properties.Title = "Popis osoba";
                excel.Workbook.Properties.Author = "RPPP04";
                var worksheet = excel.Workbook.Worksheets.Add("Osobe");

                int j = 1;
                for (int i = 0; i < people.Count; i++)
                {
                    worksheet.Cells[j, 1].Value = "Ime";
                    worksheet.Cells[j + 1, 1].Value = "Prezime";
                    worksheet.Cells[j + 2, 1].Value = "Oib";

                    worksheet.Cells[j, 1].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j + 1, 1].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j + 2, 1].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 1].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);
                    worksheet.Cells[j + 1, 1].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);
                    worksheet.Cells[j + 2, 1].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);

                    worksheet.Cells[j, 2].Value = people[i].FirstName;
                    worksheet.Cells[j + 1, 2].Value = people[i].LastName;
                    worksheet.Cells[j + 2, 2].Value = people[i].Oib;

                    j += 3;

                    worksheet.Cells[j, 1].Value = "#";
                    worksheet.Cells[j, 2].Value = "Naziv sadrzaja";
                    worksheet.Cells[j, 3].Value = "Opis sadrzaja";
                    worksheet.Cells[j, 4].Value = "Link";

                    worksheet.Cells[j, 1].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 2].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 3].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 4].Style.Fill.PatternType = ExcelFillStyle.Solid;

                    worksheet.Cells[j, 1].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.LightSeaGreen);
                    worksheet.Cells[j, 2].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.LightSeaGreen);
                    worksheet.Cells[j, 3].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.LightSeaGreen);
                    worksheet.Cells[j, 4].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.LightSeaGreen);

                    j++;
                    for (int k = 0; k < people[i].Contents.Count; k++)
                    {
                        worksheet.Cells[j, 1].Value = k + 1;
                        worksheet.Cells[j, 2].Value = people[i].Contents[k].Name;
                        worksheet.Cells[j, 3].Value = people[i].Contents[k].Description;
                        worksheet.Cells[j, 4].Value = people[i].Contents[k].Link;
                        j++;
                    }

                    worksheet.Cells[j, 1].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 2].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 3].Style.Fill.PatternType = ExcelFillStyle.Solid;
                    worksheet.Cells[j, 4].Style.Fill.PatternType = ExcelFillStyle.Solid;

                    worksheet.Cells[j, 1].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);
                    worksheet.Cells[j, 2].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);
                    worksheet.Cells[j, 3].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);
                    worksheet.Cells[j, 4].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Lavender);
                    j++;
                    j++;
                }
                worksheet.Cells[1, 1, 200, 4].AutoFitColumns();

                content = excel.GetAsByteArray();
            }

            return File(content, ExcelContentType, "osobeSlozeniPodaci.xlsx");
        }