📒 docs: Update utils guide documentation #3575
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Summary of Changes
Hello @ReneWerner87, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request focuses on enhancing the accuracy and readability of the documentation for the generic Convert utility function. It addresses an incorrect return type in the function's signature and refines associated code examples to ensure they are syntactically correct and clearly illustrate proper usage, including a specific type parameter correction in a whats_new entry.
Highlights
- Documentation Correction: Corrected the documented signature of the generic
Convertfunction indocs/guide/utils.mdto reflect that it returns a direct value (T) rather than a pointer (*T). - Example Clarity: Improved the clarity and correctness of the
Convertfunction's usage examples indocs/guide/utils.mdby fixing syntax (e.g., adding missing closing parentheses) and ensuring examples are complete withreturn nil. - Type Parameter Correction: Updated an example in
docs/whats_new.mdto use the correct type parameter (int) for theConvertfunction when demonstrating conversion withstrconv.Atoi, ensuring type consistency.
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Pull Request Overview
This PR corrects the generic signature of the Convert function in the docs and updates related examples for consistency.
- Updates the
Convertcall inwhats_new.mdto use the correct type parameter (int). - Changes the
Convertsignature inutils.mdto return(T, error)instead of(*T, error). - Fixes the example code blocks in
utils.mdby closing handlers properly and adding areturn nilin one handler.
Reviewed Changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| docs/whats_new.md | Switched fiber.Convert[string] to fiber.Convert[int] in example. |
| docs/guide/utils.md | Updated Convert signature to (T, error) and adjusted example blocks. |
Comments suppressed due to low confidence (2)
docs/guide/utils.md:23
- [nitpick] The example handler for
/id/:idcloses without returning a value, which may confuse readers. Consider adding a return statement (e.g.,return c.SendString(parsedValue.String())) to show how to handle the conversion result.
})
docs/guide/utils.md:16
- [nitpick] The
Convertsignature now includes a variadicdefaultValueparameter, but the examples don’t show its usage. Consider adding an example that passes a default value to demonstrate its behavior when conversion fails.
func Convert[T any](value string, converter func(string) (T, error), defaultValue ...T) (T, error)
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Code Review
This pull request corrects the signature and examples for the generic Convert function in the documentation. The changes are good, but I've found a couple of issues in the example code snippets that would cause them to fail compilation. My suggestions will make the examples valid and clearer for users. Please take a look.
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | ||
| }) |
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This handler is missing a return statement, which makes the Go code in this example invalid. A function with a return type of error must end with a return statement.
To make the example correct and more robust, you should add return nil and also handle the returned values from fiber.Convert, even if it's just by assigning them to the blank identifier _.
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | |
| }) | |
| _, _ = fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | |
| return nil | |
| }) |
| fiber.Convert(c.Query("id"), mongo.ParseObjectID) // objectid(65f6f54221fb90e6a6b76db7), nil | ||
| fiber.Convert(c.Query("id"), uuid.Parse) // uuid.Nil, error(cannot parse given uuid) | ||
| fiber.Convert(c.Query("id"), uuid.Parse, mongo.NewObjectID) // new object id generated and return nil as error. |
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The return values of fiber.Convert are not being used, which will result in a compilation error: function call ... used as value. To fix this and to show that the return values are intentionally being ignored in this example, you should assign them to the blank identifier _.
| fiber.Convert(c.Query("id"), mongo.ParseObjectID) // objectid(65f6f54221fb90e6a6b76db7), nil | |
| fiber.Convert(c.Query("id"), uuid.Parse) // uuid.Nil, error(cannot parse given uuid) | |
| fiber.Convert(c.Query("id"), uuid.Parse, mongo.NewObjectID) // new object id generated and return nil as error. | |
| _, _ = fiber.Convert(c.Query("id"), mongo.ParseObjectID) // objectid(65f6f54221fb90e6a6b76db7), nil | |
| _, _ = fiber.Convert(c.Query("id"), uuid.Parse) // uuid.Nil, error(cannot parse given uuid) | |
| _, _ = fiber.Convert(c.Query("id"), uuid.Parse, mongo.NewObjectID) // new object id generated and return nil as error. |
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Actionable comments posted: 1
🧹 Nitpick comments (1)
docs/guide/utils.md (1)
26-31: Consider showing error handling for pedagogical completeness.You already return
nil, but demonstrating typical error handling would be clearer:if _, err := fiber.Convert(c.Query("id"), uuid.Parse); err != nil { // handle err ... }
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📒 Files selected for processing (2)
docs/guide/utils.md(1 hunks)docs/whats_new.md(1 hunks)
🧰 Additional context used
🧠 Learnings (2)
📓 Common learnings
Learnt from: ReneWerner87
PR: gofiber/fiber#3161
File: app.go:923-932
Timestamp: 2024-11-15T07:56:21.623Z
Learning: In the Fiber framework, breaking changes are acceptable when moving from version 2 to version 3, including modifications to method signatures such as in the `Test` method in `app.go`.
docs/whats_new.md (7)
Learnt from: ReneWerner87
PR: gofiber/fiber#3161
File: app.go:923-932
Timestamp: 2024-11-15T07:56:21.623Z
Learning: In the Fiber framework, breaking changes are acceptable when moving from version 2 to version 3, including modifications to method signatures such as in the `Test` method in `app.go`.
Learnt from: sixcolors
PR: gofiber/fiber#3446
File: docs/middleware/logger.md:44-44
Timestamp: 2025-05-13T00:19:16.407Z
Learning: In documentation files for the Fiber framework, code examples are often partial and don't repeat import statements that were shown in earlier examples, focusing instead on demonstrating specific usage patterns.
Learnt from: gaby
PR: gofiber/fiber#3193
File: middleware/cache/cache_test.go:897-897
Timestamp: 2024-11-08T04:10:42.990Z
Learning: In the Fiber framework, `Context()` is being renamed to `RequestCtx()`, and `UserContext()` to `Context()` to improve clarity and align with Go's context conventions.
Learnt from: mdelapenya
PR: gofiber/fiber#3434
File: docs/api/services.md:39-43
Timestamp: 2025-05-07T13:07:33.899Z
Learning: When documenting Go interface methods in the Fiber project, avoid showing method signatures with the interface type as the receiver (e.g., `func (d *Service) Method()`) since interfaces cannot be used as receivers in Go. Instead, show just the method signature without a receiver or use a placeholder implementation name.
Learnt from: sixcolors
PR: gofiber/fiber#3016
File: middleware/session/config.go:122-122
Timestamp: 2024-10-08T19:06:06.583Z
Learning: In `DefaultErrorHandler(c *fiber.Ctx, err error)`, since `c` is a pointer to an interface, we need to dereference `*c` when calling interface methods like `SendStatus`.
Learnt from: sixcolors
PR: gofiber/fiber#3016
File: middleware/session/config.go:122-122
Timestamp: 2024-09-25T16:18:34.719Z
Learning: In `DefaultErrorHandler(c *fiber.Ctx, err error)`, since `c` is a pointer to an interface, we need to dereference `*c` when calling interface methods like `SendStatus`.
Learnt from: gaby
PR: gofiber/fiber#3193
File: middleware/adaptor/adaptor.go:111-111
Timestamp: 2024-11-10T23:44:13.704Z
Learning: In the `middleware/adaptor/adaptor.go` file of the Fiber framework, when updating context handling, replacing `c.Context()` with `c.RequestCtx()` is appropriate to access the `fasthttp.RequestCtx`.
🔇 Additional comments (2)
docs/guide/utils.md (1)
16-17: Signature line now correct — good catch.The updated return type
(T, error)matches the current implementation infiber/utils.go.
No further action needed.docs/whats_new.md (1)
710-712: Type parameter fix looks good.Switching to
Convert[int]removes the previous type mismatch withstrconv.Atoi.
| app.Get("/id/:id", func(c fiber.Ctx) error { | ||
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | ||
|
|
||
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | ||
| }) |
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Handler still lacks a return → won’t compile.
app.Get requires func(c fiber.Ctx) error.
The function body ends without returning an error, so the example will not compile/go-vet.
app.Get("/id/:id", func(c fiber.Ctx) error {
fiber.Convert(c.Params("id"), uuid.Parse) // UUID(...), nil
-})
+ return nil
+})📝 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.
| app.Get("/id/:id", func(c fiber.Ctx) error { | |
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | |
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | |
| }) | |
| app.Get("/id/:id", func(c fiber.Ctx) error { | |
| fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil | |
| return nil | |
| }) |
🤖 Prompt for AI Agents
In docs/guide/utils.md around lines 21 to 23, the example handler function for
app.Get does not return an error as required by the function signature. To fix
this, add a return statement that returns an error value, such as nil or an
appropriate error, at the end of the handler function to ensure it compiles
correctly.
gaby
changed the title
Summary
ConvertfunctionConvertTesting
make testhttps://chatgpt.com/codex/tasks/task_e_6872df0650d483268ea5b8635a009233