Fix rubocop nits

db/migrate/20231026032527_rename_appendable_to_reaction.rb

@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 class RenameAppendableToReaction < ActiveRecord::Migration[7.0]
   def change
     rename_table :appendables, :reactions
-    remove_column :reactions, :type
+    remove_column :reactions, :type, :string
   end
 end

lib/use_case/data_export/reactions.rb

@@ -7,8 +7,8 @@ module UseCase
         "reactions.json" => json_file!(
           reactions: [
             *user.smiles.map(&method(:collect_reaction))
-          ]
+          ],
-        )
+        ),
       }
 
       def collect_reaction(reaction)

spec/lib/use_case/data_export/reactions_spec.rb

@@ -9,7 +9,7 @@ describe UseCase::DataExport::Reactions, :data_export do
     it "returns an empty set of reactions" do
       expect(json_file("reactions.json")).to eq(
         {
-          reactions: []
+          reactions: [],
         }
       )
     end