added validators in project

BookHive/Validators/Reviews/UpdateReviewDtoValidator.cs

@@ -0,0 +1,34 @@
+using BookHive.DTO.Review;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BookHive.Validators.Reviews;
+
+public class UpdateReviewDtoValidator : Validator<UpdateReviewDto>
+{
+    public UpdateReviewDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .GreaterThan(0)
+            .WithMessage("Id is invalid.");
+        
+        RuleFor(x => x.BookId)
+            .GreaterThan(0)
+            .WithMessage("Book id is invalid.");
+        
+        RuleFor(x => x.MemberId)
+            .GreaterThan(0)
+            .WithMessage("Member id is invalid.");
+        
+        RuleFor(x => x.Rating)
+            .InclusiveBetween(1, 5)
+            .WithMessage("Rating must be between 1 and 5.");
+
+        When(x => x.Comment is not null, () =>
+        {
+            RuleFor(x => x.Comment)
+                .MaximumLength(3000)
+                .WithMessage("Comment cannot exceed 3000 characters.");
+        });
+    }
+}