fix(server): return only books with correct publisher (#71)

the example server was returning books that had different
publishers.

Author: toumorokoshi

example/service/service.go

@@ -204,9 +204,14 @@ func (s BookstoreServer) GetBook(_ context.Context, r *bpb.GetBookRequest) (*bpb
 }
 
 func (s BookstoreServer) ListBooks(_ context.Context, r *bpb.ListBooksRequest) (*bpb.ListBooksResponse, error) {
+	if r.Parent == "" {
+		return nil, status.Errorf(codes.InvalidArgument, "parent must be specified")
+	}
+
 	rows, err := s.db.Query(`
 		SELECT path, author, price, published, edition, isbn
-		FROM books`)
+		FROM books
+		WHERE path LIKE ?`, r.Parent+"/%")
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "failed to list books: %v", err)
 	}
@@ -216,7 +221,6 @@ func (s BookstoreServer) ListBooks(_ context.Context, r *bpb.ListBooksRequest) (
 	for rows.Next() {
 		book := &bpb.Book{}
 
-		// Deserialize the 'author' field from JSON when listing books
 		var authorsSerialized string
 		var isbnSerialized string
 		if err := rows.Scan(&book.Path, &authorsSerialized, &book.Price, &book.Published, &book.Edition, &isbnSerialized); err != nil {
@@ -655,7 +659,7 @@ func StartServer(targetPort int) {
 		CREATE TABLE IF NOT EXISTS books (
 			path TEXT PRIMARY KEY,
 			author TEXT,
-			price REAL,
+			price INTEGER,
 			published BOOLEAN,
 			edition INTEGER,
 			isbn TEXT

example/service/service_test.go

@@ -199,3 +199,41 @@ func TestMoveItem(t *testing.T) {
 		t.Fatalf("expected new path to be 'stores/2/items/1', got %q", newPath)
 	}
 }
+
+func TestListBooksByPublisher(t *testing.T) {
+	db := setupTestDB(t)
+	defer db.Close()
+
+	s := NewBookstoreServer(db)
+
+	// Serialize authors and ISBNs for test data
+	authorOneSerialized := `[{"name":"Author One"}]`
+	authorTwoSerialized := `[{"name":"Author Two"}]`
+	isbnOneSerialized := `["1111111111"]`
+	isbnTwoSerialized := `["2222222222"]`
+
+	// Insert test books
+	_, err := db.Exec(`
+		INSERT INTO books (path, author, price, published, edition, isbn)
+		VALUES (?, ?, ?, ?, ?, ?), (?, ?, ?, ?, ?, ?)`,
+		"publishers/1/books/1", authorOneSerialized, 10, true, 1, isbnOneSerialized,
+		"publishers/2/books/2", authorTwoSerialized, 15, true, 1, isbnTwoSerialized,
+	)
+	if err != nil {
+		t.Fatalf("failed to insert test books: %v", err)
+	}
+
+	// Test filtering by publisher 1
+	resp, err := s.ListBooks(context.Background(), &bpb.ListBooksRequest{Parent: "publishers/1"})
+	if err != nil {
+		t.Fatalf("ListBooks failed: %v", err)
+	}
+
+	if len(resp.Results) != 1 {
+		t.Fatalf("expected 1 book, got %d", len(resp.Results))
+	}
+
+	if resp.Results[0].Path != "publishers/1/books/1" {
+		t.Errorf("unexpected book path: %s", resp.Results[0].Path)
+	}
+}

scripts/serve.sh

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+go run ./...