[#78] Autocorrect EnumHash Cop

lib/rubocop/cop/rails/enum_hash.rb

@@ -40,6 +40,16 @@ def on_send(node)
           end
         end
 
+        def autocorrect(node)
+          range = node.loc.expression
+          hash = node
+                 .children
+                 .each_with_index
+                 .map { |elem, index| [elem.children.first, index] }.to_h
+
+          ->(corrector) { corrector.replace(range, hash.to_s) }
+        end
+
         private
 
         def enum_name(key)

manual/cops_rails.md

@@ -646,7 +646,7 @@ Whitelist | `find_by_sql` | Array
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | No | 2.3 | -
+Enabled | Yes | Yes  | 2.3 | -
 
 This cop looks for enums written with array syntax.
 

spec/rubocop/cop/rails/enum_hash_spec.rb

@@ -79,6 +79,17 @@
         RUBY
       end
     end
+
+    it 'autocorrects' do
+      expect_offense(<<~RUBY)
+        enum status: [:old, :"very active", "is archived", 42]
+                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enum defined as an array found in `status` enum declaration. Use hash syntax instead.
+      RUBY
+
+      expect_correction(<<~RUBY)
+        enum status: {:old=>0, :"very active"=>1, "is archived"=>2, 42=>3}
+      RUBY
+    end
   end
 
   context 'when hash syntax is used' do