[validator] add JSON tags support

[capcom6]

Summary by CodeRabbit

• Bug Fixes
  • Enhanced validation error messages to reference JSON field names instead of internal identifiers, improving clarity in error reporting.

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[coderabbitai]

Walkthrough

The validator initialization in validator.go was modified to register a custom TagNameFunc that derives validation error field names from JSON struct tags. Two imports (reflect and strings) were added to support this functionality, while maintaining the existing function signature.

Changes

Cohort / File(s)	Summary
Validator TagNameFunc Registration validator.go	Added reflect and strings imports. Modified the New() function to register a custom TagNameFunc that maps struct field validation errors to their JSON tag names (excluding "-" values), improving error reporting clarity.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding JSON tags support to the validator by registering a TagNameFunc that maps JSON field names for validation error reporting.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0b55dc1 and 5858f81.

📒 Files selected for processing (1)

• validator.go

🔇 Additional comments (2)

validator.go (2)

3-8: LGTM!

All imports are necessary and correctly used: reflect for the StructField type, strings for parsing the tag, and the validator package.

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16-24: Clean and idiomatic implementation of JSON tag extraction.

The code correctly handles:

• Fields with JSON tags (e.g., json:"name,omitempty") → extracts name
• Excluded fields (json:"-") → returns "" allowing fallback to struct field name
• Fields without JSON tags → returns "" allowing fallback to struct field name

The WithRequiredStructEnabled() and RegisterTagNameFunc() APIs are valid in go-playground/validator v10.28.0 and are used correctly here.

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