feat: update RequiredValidator to support validate empty Map, List, S…

[simonpham]

No description provided.

[joanpablo]

/gemini review

[gemini-code-assist]

Code Review

This pull request enhances the RequiredValidator to correctly identify empty collections (Map, List, Set, and other Iterables) as invalid, in addition to null and empty/whitespace-only strings. This is a useful enhancement for form validation. The implementation uses Dart's pattern matching, which is modern and appropriate.

A suggestion has been provided to simplify the code by removing redundant checks for List and Set types, as the existing Iterable check sufficiently covers these scenarios with the same logic.

For future pull requests, consider adding a brief description in the PR body to outline the changes and their rationale. It's also crucial to ensure that comprehensive unit tests are added to cover these new validation scenarios for empty collections, verifying the behavior for Map, List, Set, and other Iterable types.

[joanpablo]

Hi @simonpham Thank you for the PR, really appreciate it. If possible would you mind to address the suggestions whenever you have the time?

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.40%. Comparing base (31e3018) to head (54cc8c5).
Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/validators/required_validator.dart	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #460      +/-   ##
==========================================
+ Coverage   95.02%   95.40%   +0.38%     
==========================================
  Files          67       66       -1     
  Lines        1386     1394       +8     
==========================================
+ Hits         1317     1330      +13     
+ Misses         69       64       -5     

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[joanpablo]

Hi @simonpham
It seems like there are still some issues to solve in the PR after the change. Plase take a look whenever you have the time, and let me know if you have any questions. Thanks in advance.