add rails projections for rspec controllers

Adds support for rspec `requests/` default directory naming in addition
to `controllers/` and `intergration/`.

Based on tpope/vim-rails#368 (comment)

vim/after/ftplugin/ruby.vim

@@ -13,3 +13,32 @@ let b:ale_ruby_rubocop_executable = 'bin/rubocop'
 " let g:rubycomplete_buffer_loading = 1
 " let g:rubycomplete_classes_in_global = 1
 " let g:rubycomplete_rails = 1
+
+let g:rails_projections = {
+      \  "app/controllers/*_controller.rb": {
+      \      "test": [
+      \        "spec/requests/{}_spec.rb",
+      \        "spec/controllers/{}_controller_spec.rb",
+      \        "test/controllers/{}_controller_test.rb",
+      \        "test/integration/{}_controller_test.rb",
+      \      ],
+      \      "alternate": [
+      \        "spec/requests/{}_spec.rb",
+      \        "spec/controllers/{}_controller_spec.rb",
+      \        "test/controllers/{}_controller_test.rb",
+      \        "test/integration/{}_controller_test.rb",
+      \      ],
+      \   },
+      \   "spec/requests/*_spec.rb": {
+      \      "command": "request",
+      \      "alternate": "app/controllers/{}_controller.rb",
+      \      "template": "require 'rails_helper'\n\n" .
+      \        "RSpec.describe '{}' do\nend",
+      \   },
+      \   "test/integration/*_test.rb": {
+      \      "command": "request",
+      \      "alternate": "app/controllers/{}_controller.rb",
+      \      "template": "require 'rails_helper'\n\n" .
+      \        "RSpec.describe '{}' do\nend",
+      \   },
+      \ }