Some fixes added to api.

WMS.Api/WMS.Api/Controllers/SalesController.cs

@@ -44,6 +44,10 @@ public ActionResult<SaleDto> Post([FromBody] SaleForCreateDto sale)
         [HttpPut("{id:int}")]
         public ActionResult UpdateSale(int id, SaleForUpdateDto sale)
         {
+            if(id != sale.Id)
+            {
+                return BadRequest($"Id : {id} does not match with sale id : {sale.Id}");
+            }
             _saleService.Update(sale);
 
             return NoContent();

WMS.Api/WMS.Api/appsettings.Development.json

@@ -6,6 +6,6 @@
     }
   },
   "ConnectionStrings": {
-    "DefaultConnection": "Data Source=miraziz\\sqlexpress;Initial Catalog=WMS;Integrated Security=True;Pooling=False;Encrypt=True;Trust Server Certificate=True"
+    "DefaultConnection": "Data Source=DESKTOP-UVO0SDG;Initial Catalog=WMS_API_DB;Integrated Security=True;Pooling=False;Encrypt=True;Trust Server Certificate=True"
   }
-}
+} 

WMS.Api/WMS.Services/DTOs/Sale/SaleForUpdateDto.cs

@@ -1,9 +1,14 @@
-namespace WMS.Services.DTOs.Sale;
+using System.ComponentModel.DataAnnotations;
+using WMS.Services.DTOs.SaleItem;
+
+namespace WMS.Services.DTOs.Sale;
 
 public class SaleForUpdateDto
 {
     public int Id { get; set; }
     public DateTime Date { get; init; }
     public decimal TotalPaid { get; init; }
     public int CustomerId { get; init; }
+    [Required]
+    public IEnumerable<SaleItemForCreateDto> SaleItems { get; set; }
 }

WMS.Api/WMS.Services/DashboardService.cs

@@ -34,9 +34,15 @@ public async Task<DashboardDto> GetDashboardAsync()
     private async Task<SummaryDto> GetSummaryAsync()
     {
         var summary = new SummaryDto();
-        summary.Revenue = _context.Sales.Sum(x => x.TotalDue) - _context.Supplies.Sum(x => x.TotalDue);
-        summary.LowQuantityProducts = _context.Products.Count(x => x.LowQuantityAmount >= x.QuantityInStock);
-        summary.CustomersAmount = _context.Customers.Count();
+        summary.Revenue = _context.Sales
+            .AsNoTracking()
+            .Sum(x => x.TotalDue) - _context.Supplies.AsNoTracking().Sum(x => x.TotalDue);
+
+        summary.LowQuantityProducts = _context.Products
+            .AsNoTracking()
+            .Count(x => x.LowQuantityAmount >= x.QuantityInStock);
+
+        summary.CustomersAmount = _context.Customers.AsNoTracking().Count();
 
         return summary;
     }
@@ -56,7 +62,7 @@ orderby category.Name
                                   SalesCount = groupedCategories.Count()
                               };
 
-        return await salesByCategory.ToListAsync();
+        return await salesByCategory.AsSplitQuery().AsNoTracking().ToListAsync();
     }
 
     private async Task<List<SplineChart>> GetChartAsync()
@@ -98,7 +104,8 @@ from expense in joinedExpense.DefaultIfEmpty()
                             Income = income?.Income ?? 0,
                         };
 
-        return chartData.ToList();
+        return chartData
+            .ToList();
     }
 
     private async Task<List<TransactionDto>> GetLatestTransactionsAsync()
@@ -113,6 +120,8 @@ private async Task<List<TransactionDto>> GetLatestTransactionsAsync()
                 Date = x.Date,
                 Type = "Sale"
             })
+            .AsSplitQuery()
+            .AsNoTracking()
             .ToList();
         var supplies = _context.Supplies
             .Where(x => x.Date.Day == DateTime.Now.Day)
@@ -123,6 +132,8 @@ private async Task<List<TransactionDto>> GetLatestTransactionsAsync()
                 Date = x.Date,
                 Type = "Supply"
             })
+            .AsSplitQuery()
+            .AsNoTracking()
             .ToList();
 
         List<TransactionDto> transactions = [.. sales, .. supplies];

WMS.Api/WMS.Services/SaleService.cs

@@ -105,7 +105,35 @@ public void Update(SaleForUpdateDto sale)
         }
 
         var entity = _mapper.Map<Sale>(sale);
-        _context.Sales.Update(entity);
+
+        entity.TotalDue = sale.SaleItems.Sum(x => x.Quantity * x.UnitPrice);
+
+        foreach (var item in entity.SaleItems)
+        {
+            var product = _context.Products.FirstOrDefault(x => x.Id == item.ProductId);
+
+            if (product is null)
+            {
+                throw new InvalidOperationException($"Cannot create sale for non-existing product: {item.ProductId}.");
+            }
+
+            if (product?.QuantityInStock < item.Quantity)
+            {
+                throw new InvalidOperationException($"Not enough items in stock: {item.Quantity} for product {product.Name}.");
+            }
+
+            product.QuantityInStock -= item.Quantity;
+        }
+
+        var customer = _context.Customers.FirstOrDefault(x => x.Id == sale.CustomerId);
+
+        if (customer is null)
+        {
+            throw new InvalidOperationException($"Cannot create sale for customer which does not exist. Customer id: {sale.CustomerId}");
+        }
+        customer.Balance += entity.TotalPaid - entity.TotalDue;
+
+        var createdSale = _context.Sales.Update(entity);
         _context.SaveChanges();
     }
 }