🐛 Add authors#mods_count that wasn't being used

app/models/authors_mod.rb

@@ -1,4 +1,4 @@
 class AuthorsMod < ActiveRecord::Base
   belongs_to :mod
-  belongs_to :author
+  belongs_to :author, counter_cache: :mods_count
 end

spec/models/authors_mod_spec.rb

@@ -7,4 +7,15 @@ describe AuthorsMod, type: :model do
   it { expect(authors_mod.build_author).to be_kind_of Author }
   it { is_expected.to respond_to :sort_order }
   it { expect(authors_mod.sort_order).to be_kind_of Integer }
+
+  describe '#mods_count' do
+    it 'should increase with mods' do
+      a = create :author
+      create :mod, authors: [a]
+      create :mod, authors: [a]
+      create :mod, authors: [a]
+      a.reload
+      expect(a.mods_count).to eq 3
+    end
+  end
 end