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Fix false positives for Rails/CompactBlank #1313

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@koic koic commented Jul 13, 2024

This PR fixes false positives for Rails/CompactBlank when using collection.reject!.

reject!(&:blank?) is not equivalent to compact_blank!:

{}.reject!(&:blank?)            # => nil
{}.reject! { |_k, v| v.blank? } # => nil
{}.compact_blank!               # => {}

This PR prioritizes safer behavior with plain hashes and arrays.


Before submitting the PR make sure the following are checked:

  • The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
  • Wrote good commit messages.
  • Commit message starts with [Fix #issue-number] (if the related issue exists).
  • Feature branch is up-to-date with master (if not - rebase it).
  • Squashed related commits together.
  • Added tests.
  • Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
  • Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.
  • If this is a new cop, consider making a corresponding update to the Rails Style Guide.

This PR fixes false positives for `Rails/CompactBlank`
when using `collection.reject!`.

`reject!(&:blank?)` is not equivalent to `compact_blank!`:

```ruby
{}.reject!(&:blank?)            # => nil
{}.reject! { |_k, v| v.blank? } # => nil
{}.compact_blank!               # => {}
```

This PR prioritizes safer behavior with plain hashes and arrays.
@koic koic merged commit 4464181 into rubocop:master Jul 14, 2024
14 checks passed
@koic koic deleted the fix_false_positive_for_rails_compact_blank branch July 14, 2024 08:23
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