Support Rails 7 syntax for Rails/EnumHash cop

[ytjmt]

Rails 7.0 introduced a new enum syntax ( rails/rails#41328 ):

enum :status, [:active, :archived]
enum :status, { active: 0, archived: 1 }

Rails/EnumHash cop does't support the new syntax yet. This PR adds the new syntax support.

---

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.

[ytjmt]

📝 diff:

• Wrap existing tests with context 'when old syntax is used'.
• Duplicate existing tests, wrap them with context 'when Rails 7 syntax is used', and update to use the new syntax.
  • Remove context 'with multiple enum definition for a enum method call' as the new syntax doesn't support multiple enum definitions.

[koic]

Can you follow up expect_correction with expect_offense? Please do this for the diffs in this PR.

[koic]

I think there are generally no pragmatic issues, but it would be best if this new syntax is only detected in Rails 7.0 and later. In other words, it will not be detected in Rails 6.1 or earlier.

[ytjmt]

Thank you for the review. I have updated the PR according to the comments.

[koic]

Can you add a case that ensures offenses are not detected when using :rails61 context while still maintaining this :rails70 context? A representative test case could used expect_no_offenses for the example code from L5 to L17.

e.g.,

  context 'when Rails 6.1 or lower', :rails61 do
    context 'when array syntax is used' do
      context 'with %i[] syntax' do
        it 'does not register an offense' do
          expect_no_offenses(<<~RUBY)
            enum :status, %i[active archived]
          RUBY
        end
      end
    end
  end

[koic]

@ytjmt ping.

[koic]

It is planned to be included in the release scheduled for this weekend. Let's add the specs later.