Style/HashAsLastArrayItem for array of hashes

[dvandersluis]

I believe this might be similar to #8409, but the reverse. When EnforcedStyle is no_braces, Style/HashAsLastArrayItem is a bit over-zealous IMO when it comes to an array of only hashes, and suggests removing the outer braces for the last element, which is going to lead to confusion.

Can the cop be updated to not consider arrays that are only hashes?

---

Expected behavior

Cop should not find any offense with this code with EnforcedStyle: no_braces:

QUOTES = [
  {
    background_color: '#EE0F0F',
    id: 2987584,
    quote_author_id: 8202,
    quote_author_title: 'John Smith',
    image_filename: 'image-2987584.png'
  },
  {
    background_color: '#EE0F0F',
    id: 2948124,
    quote_author_id: 1709304,
    quote_author_title: 'Tim Brown',
    image_filename: 'image-2948124.png'
  }
].freeze

Actual behavior

The cop registers offenses for the outer braces on the last element, and autocorrects them away:

QUOTES = [
  {
    background_color: '#EE0F0F',
    id: 2987584,
    quote_author_id: 8202,
    quote_author_title: 'John Smith',
    image_filename: 'image-2987584.png'
  },

  background_color: '#EE0F0F',
  id: 2948124,
  quote_author_id: 1709304,
  quote_author_title: 'Tim Brown',
  image_filename: 'image-2948124.png'
].freeze

RuboCop version

Include the output of rubocop -V or bundle exec rubocop -V if using Bundler. Here's an example:

$ [bundle exec] rubocop -V
0.89.1 (using Parser 2.7.1.4, rubocop-ast 0.3.0, running on ruby 2.6.2 x86_64-darwin18)