🔹 𝗥𝗼𝗹𝗲-𝗕𝗮𝘀𝗲𝗱 𝗘𝘅𝗽𝗲𝗻𝘀𝗲 𝗙𝗶𝗹𝘁𝗲𝗿𝗶𝗻𝗴 𝗶𝗻 𝗘𝘅𝗽𝗲𝗻𝘀𝗲 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝗦𝘆𝘀𝘁𝗲𝗺

𝗧𝗵𝗶𝘀 𝗶𝘀 𝗺𝘆 𝗿𝗲𝘀𝗲𝗮𝗿𝗰𝗵 𝘄𝗵𝗶𝗹𝗲 𝗶𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗶𝗻𝗴 𝗘𝘅𝗽𝗲𝗻𝘀𝗲𝗦𝗲𝗿𝘃𝗶𝗰𝗲.𝗰𝘀 𝗶𝗻 𝗮𝗻 𝗘𝘅𝗽𝗲𝗻𝘀𝗲 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝗦𝘆𝘀𝘁𝗲𝗺. Instead of handling role-based filtering in the controller, moving it to the service layer improves 𝗰𝗼𝗱𝗲 𝗰𝗹𝗲𝗮𝗻𝗹𝗶𝗻𝗲𝘀𝘀, 𝗿𝗲𝘂𝘀𝗮𝗯𝗶𝗹𝗶𝘁𝘆, 𝗮𝗻𝗱 𝘁𝗲𝘀𝘁𝗮𝗯𝗶𝗹𝗶𝘁𝘆.

🚀𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗶𝗻𝗴 𝗥𝗼𝗹𝗲-𝗕𝗮𝘀𝗲𝗱 𝗘𝘅𝗽𝗲𝗻𝘀𝗲 𝗙𝗶𝗹𝘁𝗲𝗿𝗶𝗻𝗴

1️⃣ 𝗜𝗻𝗷𝗲𝗰𝘁 𝗗𝗯𝗖𝗼𝗻𝘁𝗲𝘅𝘁 𝗶𝗻𝘁𝗼 𝗘𝘅𝗽𝗲𝗻𝘀𝗲𝗦𝗲𝗿𝘃𝗶𝗰𝗲.𝗰𝘀

private readonly ApplicationDbContext _context;
public ExpenseService(ApplicationDbContext context) => _context = context;

2️⃣ 𝗖𝗿𝗲𝗮𝘁𝗲 𝗮 𝗺𝗲𝘁𝗵𝗼𝗱 𝘁𝗼 𝗳𝗲𝘁𝗰𝗵 𝗲𝘅𝗽𝗲𝗻𝘀𝗲𝘀 𝗯𝗮𝘀𝗲𝗱 𝗼𝗻 𝗿𝗼𝗹𝗲

public async Task> GetExpensesAsync(string userId, string userRole) =>
await _context.Expenses
.Where(e => userRole == "Admin" || e.UserId == userId)
.OrderByDescending(e => e.CreatedAt)
.ToListAsync();

3️⃣ 𝗜𝗻𝗷𝗲𝗰𝘁 𝗘𝘅𝗽𝗲𝗻𝘀𝗲𝗦𝗲𝗿𝘃𝗶𝗰𝗲 𝗶𝗻𝘁𝗼 𝗘𝘅𝗽𝗲𝗻𝘀𝗲𝗖𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿.𝗰𝘀

private readonly ExpenseService _expenseService;
public ExpenseController(ExpenseService expenseService) => _expenseService = expenseService;

4️⃣ 𝗥𝗲𝘁𝗿𝗶𝗲𝘃𝗲 𝘂𝘀𝗲𝗿 𝗱𝗲𝘁𝗮𝗶𝗹𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿

var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
var userRole = User.FindFirstValue(ClaimTypes.Role);

5️⃣ 𝗖𝗮𝗹𝗹 𝗚𝗲𝘁𝗘𝘅𝗽𝗲𝗻𝘀𝗲𝘀𝗔𝘀𝘆𝗻𝗰() 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 𝗮𝗻𝗱 𝗽𝗮𝘀𝘀 𝘂𝘀𝗲𝗿 𝗱𝗲𝘁𝗮𝗶𝗹𝘀

var expenses = await _expenseService.GetExpensesAsync(userId, userRole);
return View(expenses);

6️⃣ 𝗞𝗲𝗲𝗽 𝗰𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿𝘀 𝗰𝗹𝗲𝗮𝗻, 𝗲𝗻𝘀𝘂𝗿𝗶𝗻𝗴 𝗺𝗮𝗶𝗻𝘁𝗮𝗶𝗻𝗮𝗯𝗶𝗹𝗶𝘁𝘆 & 𝗿𝗲𝘂𝘀𝗮𝗯𝗶𝗹𝗶𝘁𝘆

✔ 𝗦𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝗰𝗼𝗻𝗰𝗲𝗿𝗻𝘀 – Business logic stays in the service layer.

✔ 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗲𝗱 – Fetches only necessary data based on the user role.

✔ 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲 & 𝘁𝗲𝘀𝘁𝗮𝗯𝗹𝗲 – Easy to extend and unit test 'ExpenseService.cs`.

❓ 𝗪𝗵𝗮𝘁 𝗱𝗼 𝘆𝗼𝘂 𝘁𝗵𝗶𝗻𝗸?

𝗪𝗼𝘂𝗹𝗱 𝘆𝗼𝘂 𝗽𝗿𝗲𝗳𝗲𝗿 𝗿𝗼𝗹𝗲-𝗯𝗮𝘀𝗲𝗱 𝗳𝗶𝗹𝘁𝗲𝗿𝗶𝗻𝗴 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 𝗼𝗿 𝘁𝗵𝗲 𝘀𝗲𝗿𝘃𝗶𝗰𝗲 𝗹𝗮𝘆𝗲𝗿? 𝗦𝗵𝗮𝗿𝗲 𝘆𝗼𝘂𝗿 𝘁𝗵𝗼𝘂𝗴𝗵𝘁𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗺𝗺𝗲𝗻𝘁𝘀! 👇

#𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 #𝗖𝗹𝗲𝗮𝗻𝗖𝗼𝗱𝗲 #𝗥𝗼𝗹𝗲𝗕𝗮𝘀𝗲𝗱𝗔𝗰𝗰𝗲𝘀𝘀 #𝗖𝗼𝗱𝗶𝗻𝗴𝗕𝗲𝘀𝘁𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲𝘀 #𝗕𝗮𝗰𝗸𝗲𝗻𝗱𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 #𝗖𝗼𝗱𝗲𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 🚀