feat: add Bind().WithSplitting() for per-call override of EnableSplittingOnParsers by miladev95 · Pull Request #4648 · gofiber/fiber

miladev95 · 2026-09-02T09:56:23Z

Add `Bind().WithSplitting()` for per-call override of `EnableSplittingOnParsers`

Summary

EnableSplittingOnParsers is currently a single, global fiber.Config flag that controls whether comma-separated values are split into slice elements for Query, Header, RespHeader, Cookie, and Form binding. This forces an all-or-nothing choice: turning it on splits everywhere, leaving it off disables splitting everywhere.

This PR adds a chainable per-call override so a single request can opt in or out without flipping the global config:

// Force splitting for this request only:
c.bind().WithSplitting(true).Query(&q)

// Suppress splitting even if the app config has it enabled:
c.bind().WithSplitting(false).Query(&q)

The override applies to every binding method on the same Bind chain (Query, Header, RespHeader, Cookie, Form) and is scoped to that bind instance — it does not leak across requests that reuse the same pool entry.

Changes

bind.go

Add tri-state overrideSplitting *bool field to Bind. nil falls back to the app's EnableSplittingOnParsers config; non-nil forces the value for the current chain. (*bool is required to distinguish "use config" from "explicitly false".)
Add Bind.WithSplitting(enable bool) *Bind chainable method.
Add internal Bind.splittingEnabled() helper that resolves the effective value.
Replace the five direct reads of b.ctx.App().config.EnableSplittingOnParsers in Header, RespHeader, Cookie, Query, and Form with b.splittingEnabled().
Reset overrideSplitting = nil in Bind.release() so the override does not leak across pooled Bind instances.
Reorder Bind struct fields per betteralign (saves 8 bytes per instance).

bind_test.go

Add Test_Bind_WithSplitting with 5 parallel subtests covering:

Override on with app config off.
Override off with app config on.
No override honors the app config.
Override does not leak across reused pool entries.
Override applies to Header binding (not just Query).

docs/api/bind.md

Add a "Per-Bind Override" section under the comma-separated values docs describing the new method, the affected binding methods, and the per-instance scoping guarantee.
WhyUsers have asked for the ability to split in some routes but not others without maintaining two app configurations. The existing SkipValidation(bool) / WithAutoHandling() chainable methods establish the pattern; WithSplitting follows the same convention.

Behavior

Default (no WithSplitting call): identical to current code — uses fiber.Config{EnableSplittingOnParsers}.
WithSplitting(true): splits comma-separated values for the current chain regardless of the app config.
WithSplitting(false): suppresses splitting for the current chain regardless of the app config.
Override is reset when the Bind instance is released back to bindPool (Bind.release()), matching the lifecycle of shouldSkipValidation and shouldSkipErrHandling.

Verification

All programmatic checks pass:
make audit # ✅ go mod verify, go vet, govulncheck — clean
make generate # ✅
make betteralign # ✅ (pre-existing path.go / router.go warnings on main are unrelated and not touched)
make format # ✅
make lint # ✅ 0 issues
make test # ✅ 5515 tests, 1 skipped in 47.317s
The new test Test_Bind_WithSplitting passes alongside the full suite.

Compatibility

Purely additive — no breaking changes. Existing callers that never invoke WithSplitting see identical behavior.

…tingOnParsers

welcome · 2026-09-02T09:56:27Z

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coderabbitai · 2026-09-02T09:57:19Z

No actionable comments were generated in the recent review. 🎉

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📒 Files selected for processing (3)

bind.go
bind_test.go
docs/api/bind.md

🚧 Files skipped from review as they are similar to previous changes (3)

bind_test.go
bind.go
docs/api/bind.md

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Walkthrough

Bind supports a per-chain parser splitting override. Binding methods use the override or application configuration. Context release clears the override. Tests and documentation cover inheritance, forced values, pooled contexts, and multiple binders.

Changes

Per-bind splitting override

Layer / File(s)	Summary
Override state and lifecycle `bind.go`	`Bind` stores an optional splitting override. `WithSplitting` sets it, `splittingEnabled` resolves it, and `release` clears it.
Binder integration and validation `bind.go`, `bind_test.go`, `docs/api/bind.md`	Header, response-header, cookie, query, and form binders use the resolved value. Tests and documentation cover the override behavior.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 5c4de

This change adds per-bind parser-splitting control while preserving application-configuration fallback and clearing override state on reuse. No concrete merge-blocking risk is identified.

Sequence Diagram(s)

sequenceDiagram
  participant BindChain
  participant AppConfig
  participant QueryBinder
  BindChain->>AppConfig: Read EnableSplittingOnParsers when no override exists
  BindChain->>QueryBinder: Provide the resolved EnableSplitting value
  BindChain->>QueryBinder: Apply WithSplitting override when set

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The patch grows clear beneath the moon,
Small changes hop in place,
Tests guard the garden path,
Reviews bloom before the dawn.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the purpose, behavior, affected APIs, tests, documentation, verification, and compatibility. It does not include an issue reference or explicitly complete the template…
Title check	✅ Passed	The title clearly and concisely identifies the new Bind().WithSplitting() API and its purpose as a per-call override.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Resolve merge conflict in branch feat/bind-with-splitting

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Actionable comments posted: 1

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Inline comments:
In `@docs/api/bind.md`:
- Line 673: Declare the q variable before the
c.Bind().WithSplitting(true).Query(&q) call in the example so the snippet is
self-contained and compilable.

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📒 Files selected for processing (3)

bind.go
bind_test.go
docs/api/bind.md

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gaby · 2026-09-04T11:48:06Z

 type Bind struct {
-	ctx                   Ctx
+	ctx Ctx
+	// overrideSplitting tri-state: nil falls back to the app's


Remove this comment

gaby · 2026-09-04T11:48:26Z


+// WithSplitting overrides the app's EnableSplittingOnParsers config for the
+// current bind chain. When enabled, comma-separated values are split into
+// individual elements for fields whose target type is a slice.


This is too verbose

gaby · 2026-09-04T11:48:31Z

+}
+
+// splittingEnabled reports the effective comma-splitting setting for this bind
+// chain, falling back to the app's EnableSplittingOnParsers config when no


This is too verbose

gaby · 2026-09-04T11:48:58Z

+// EnableSplittingOnParsers config flag. It verifies:
+//  1. With no override, the chain inherits the app config.
+//  2. WithSplitting(true) forces splitting even when the app config is off.
+//  3. WithSplitting(false) suppresses splitting even when the app config is on.


Remove this whole comment, should only be the 1st line

codecov · 2026-09-04T11:51:48Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.79%. Comparing base (b192a98) to head (33e3fe5).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4648      +/-   ##
==========================================
+ Coverage   93.75%   93.79%   +0.04%     
==========================================
  Files         140      140              
  Lines       16237    16245       +8     
==========================================
+ Hits        15223    15237      +14     
+ Misses        640      635       -5     
+ Partials      374      373       -1

Flag	Coverage Δ
unittests	`93.79% <100.00%> (+0.04%)`	⬆️

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- Trim verbose comments on overrideSplitting, WithSplitting, splittingEnabled, and the test - Declare q in docs/api/bind.md example

miladev95 · 2026-09-06T07:22:36Z

@gaby please review again

feat: add Bind().WithSplitting() for per-call override of EnableSplit…

33e3fe5

…tingOnParsers

miladev95 requested a review from a team as a code owner September 2, 2026 09:56

miladev95 requested review from ReneWerner87, efectn, gaby and sixcolors September 2, 2026 09:56

ReneWerner87 added v3 ✏️ Feature labels Sep 2, 2026

ReneWerner87 added this to v3 Sep 2, 2026

ReneWerner87 added this to the v3 milestone Sep 2, 2026

coderabbitai Bot reviewed Sep 2, 2026

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Comment thread docs/api/bind.md

gaby reviewed Sep 4, 2026

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gaby requested changes Sep 4, 2026

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gaby mentioned this pull request Sep 5, 2026

🐛 bug: fix correctness issues across core, router, binder, client and middleware #4652

Merged

18 tasks

chore(bind): address review feedback for WithSplitting

5c4de33

- Trim verbose comments on overrideSplitting, WithSplitting, splittingEnabled, and the test - Declare q in docs/api/bind.md example

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feat: add Bind().WithSplitting() for per-call override of EnableSplittingOnParsers - #4648

feat: add Bind().WithSplitting() for per-call override of EnableSplittingOnParsers#4648
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miladev95 commented Sep 2, 2026

Add Bind().WithSplitting() for per-call override of EnableSplittingOnParsers

Summary

Changes

Behavior

Verification

Compatibility

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Walkthrough

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Sequence Diagram(s)

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Add `Bind().WithSplitting()` for per-call override of `EnableSplittingOnParsers`

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