first commit

BookHive/Specifications/Authors/GetAuthorByIdSpec.cs

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+using Ardalis.Specification;
+using BookHive.Models;
+
+namespace BookHive.Specifications.Authors;
+
+public class GetAuthorByIdSpec : SingleResultSpecification<Author>
+{
+    public GetAuthorByIdSpec(int authorId)
+    {
+        Query
+            .Where(x => x.Id == authorId);
+    }
+}

BookHive/Specifications/Books/GetBookByIdSpec.cs

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+using Ardalis.Specification;
+using BookHive.Models;
+
+namespace BookHive.Specifications.Books;
+
+public class GetBookByIdSpec : SingleResultSpecification<Book>
+{
+    public GetBookByIdSpec(int bookId)
+    {
+        Query
+            .Where(x => x.Id == bookId);
+    }
+}

BookHive/Specifications/Loans/GetLoanByIdSpec.cs

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+using Ardalis.Specification;
+using BookHive.Models;
+
+namespace BookHive.Specifications.Loans;
+
+public class GetLoanByIdSpec : SingleResultSpecification<Loan>
+{
+    public GetLoanByIdSpec(int loanId)
+    {
+        Query
+            .Where(x => x.Id == loanId);
+    }
+}

BookHive/Specifications/Members/GetMemberByIdSpec.cs

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+using Ardalis.Specification;
+using BookHive.Models;
+
+namespace BookHive.Specifications.Members;
+
+public class GetMemberByIdSpec : SingleResultSpecification<Member>
+{
+    public GetMemberByIdSpec(int memberId)
+    {
+        Query
+            .Where(x => x.Id == memberId);
+    }
+}

BookHive/Specifications/Reviews/GetReviewByBookIdSpec.cs

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+using Ardalis.Specification;
+using BookHive.Models;
+
+namespace BookHive.Specifications.Reviews;
+
+public class GetReviewByBookIdSpec : Specification<Review>
+{
+    public GetReviewByBookIdSpec(int bookId)
+    {
+        Query
+            .Where(x => x.Id == bookId);
+    }
+}

BookHive/Specifications/Reviews/GetReviewByIdSpec.cs

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+using Ardalis.Specification;
+using BookHive.Models;
+
+namespace BookHive.Specifications.Reviews;
+
+public class GetReviewByIdSpec : SingleResultSpecification<Review>
+{
+    public GetReviewByIdSpec(int reviewId)
+    {
+        Query
+            .Where(x => x.Id == reviewId);
+    }
+}