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solution for challenge9 #552
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WalkthroughAdds an in-memory book management module in a single Go file, defining domain model, repository, service, HTTP handler, interfaces, constructors, and a main function to start an HTTP server exposing CRUD and search endpoints for books. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
actor Client
participant HTTP as HTTP Server
participant Handler as BookHandler
participant Service as BookService
participant Repo as InMemoryBookRepository
rect rgba(200,220,255,0.25)
note over Client,HTTP: Create Book
Client->>HTTP: POST /api/books {book}
HTTP->>Handler: HandleBooks(request)
Handler->>Service: CreateBook(book)
Service->>Repo: Create(book)
Repo-->>Service: result / error
Service-->>Handler: result / error
Handler-->>HTTP: 201 Created / 400-500
HTTP-->>Client: JSON response
end
rect rgba(200,255,200,0.25)
note over Client,HTTP: Get/List/Search
Client->>HTTP: GET /api/books[?author=...|title=...]
HTTP->>Handler: HandleBooks(request)
alt search by author/title
Handler->>Service: SearchBooksByAuthor/Title(q)
else list all
Handler->>Service: GetAllBooks()
end
Service->>Repo: Query
Repo-->>Service: Books
Service-->>Handler: Books
Handler-->>HTTP: 200 OK
HTTP-->>Client: JSON array
end
rect rgba(255,230,200,0.25)
note over Client,HTTP: Get/Update/Delete by ID
Client->>HTTP: GET/PUT/DELETE /api/books/{id}
HTTP->>Handler: HandleBooks(request)
opt GET
Handler->>Service: GetBookByID(id)
Service->>Repo: GetByID(id)
end
opt PUT
Handler->>Service: UpdateBook(id, book)
Service->>Repo: Update(id, book)
end
opt DELETE
Handler->>Service: DeleteBook(id)
Service->>Repo: Delete(id)
end
Repo-->>Service: result / not found
Service-->>Handler: result / error
Handler-->>HTTP: 200/204/404/400
HTTP-->>Client: JSON / message
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Pre-merge checks❌ Failed checks (1 warning, 2 inconclusive)
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Actionable comments posted: 4
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Prevent ID reuse when books are deleted.
Create derives the next ID from len(x.books)+1. Once an item is deleted, that ID is recycled, causing the next create to overwrite an existing book silently. This corrupts stored data. Please generate IDs that skip occupied keys.
Apply this diff:
- book.ID = strconv.Itoa(len(x.books) + 1) - x.books[strconv.Itoa((len(x.books) + 1))] = book - - return nil + nextID := len(x.books) + 1 + for { + id := strconv.Itoa(nextID) + if _, exists := x.books[id]; !exists { + book.ID = id + x.books[id] = book + return nil + } + nextID++ + }
🤖 Prompt for AI Agents
In challenge-9/submissions/kushalShukla-web/solution-template.go around lines 94
to 101, the Create method currently assigns ID using len(x.books)+1 which reuses
IDs after deletions and can overwrite existing books; change it to compute a new
unused numeric ID by scanning existing map keys, parsing them to ints, finding
the maximum numeric ID, and using max+1 (or alternatively loop incrementing a
counter until you find a key that does not exist) before assigning book.ID and
storing the book; also keep the nil check and return an error as before.
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Fix GET /api/books response handling.
After logging an internal error the handler keeps writing a success payload, and on success it responds with 201 instead of 200. Return immediately on errors and stick to HTTP 200 for successful reads.
Apply this diff:
- if err != nil { - w.WriteHeader(http.StatusInternalServerError) - w.Write([]byte(err.Error())) - } - if len(books) == 0 { - w.WriteHeader(http.StatusOK) - } else { - w.WriteHeader(http.StatusCreated) - } - json.NewEncoder(w).Encode(books) + if err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + return + } + w.WriteHeader(http.StatusOK) + json.NewEncoder(w).Encode(books)
📝 Committable suggestion
!!️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
🤖 Prompt for AI Agents
In challenge-9/submissions/kushalShukla-web/solution-template.go around lines
200 to 212, the GET /api/books branch continues after an internal error and uses
201 for successful reads; change it to return immediately after writing the
error response and set successful responses to HTTP 200. Specifically: after
detecting err != nil write status 500 and the error body then return; for the
non-error path always write status 200 (not 201) and then encode the books;
ensure you don't write multiple headers before the return.
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Stop writing a second response body on 404s.
When GetBookByID returns an error, the handler writes the 404 and error message but still encodes &book, appending null to the response and muddying clients. Return immediately after the error and encode the book directly on success.
Apply this diff:
- book, err := h.Service.GetBookByID(id) - if err != nil { - w.WriteHeader(http.StatusNotFound) - w.Write([]byte(err.Error())) - } - json.NewEncoder(w).Encode(&book) + book, err := h.Service.GetBookByID(id) + if err != nil { + http.Error(w, err.Error(), http.StatusNotFound) + return + } + json.NewEncoder(w).Encode(book)
📝 Committable suggestion
!!️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
🤖 Prompt for AI Agents
In challenge-9/submissions/kushalShukla-web/solution-template.go around lines
257 to 265, the handler writes a 404 and error body when GetBookByID returns an
error but then continues to JSON-encode &book (producing an extra "null" or
duplicate body). Fix by returning immediately after writing the 404 and error
(do not fall through), and only call json.NewEncoder(w).Encode(book) on the
successful path; ensure you set the success status (e.g., http.StatusOK) if
desired before encoding.
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Return the actual error for failed deletes.
If DeleteBook fails, the handler still emits "Book deleted successfully," misleading clients. Propagate the error response instead of returning a success payload.
Apply this diff:
- err := h.Service.DeleteBook(id) - if err != nil { - w.WriteHeader(http.StatusNotFound) - } - json.NewEncoder(w).Encode(map[string]string{ - "message": "Book deleted successfully", - }) - return + if err := h.Service.DeleteBook(id); err != nil { + http.Error(w, err.Error(), http.StatusNotFound) + return + } + json.NewEncoder(w).Encode(map[string]string{ + "message": "Book deleted successfully", + }) + return
📝 Committable suggestion
!!️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
🤖 Prompt for AI Agents
In challenge-9/submissions/kushalShukla-web/solution-template.go around lines
290 to 298, the handler currently returns a "Book deleted successfully" payload
even when h.Service.DeleteBook(id) fails; change the logic so that if err != nil
you write an appropriate status (e.g. http.StatusNotFound or
http.StatusInternalServerError depending on error), encode and return a JSON
error payload with the actual err.Error(), and return immediately; only when
DeleteBook succeeds should you encode and return the success JSON (or use
http.StatusNoContent) so clients never receive a success message on failure.
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