add support to specify author models

README.md

@@ -272,6 +272,15 @@ article.rates_records
 # { value: 1 }, { value: 3, scopeable: category_1 }, { value: 5, scopeable: category_2 }
 ```
 
+### As
+
+If you have a model that will only be able to rate but not to receive a rate, configure it as `author`.
+An author model still can be rated, but won't genarate a Rating record with all values as zero to be easier to display.
+
+```ruby
+rating as: :author
+```
+
 ## Love it!
 
 Via [PayPal](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=X8HEP2878NDEG&item_name=rating) or [Gratipay](https://gratipay.com/rating). Thanks! (:

lib/rating/models/rating/extension.rb

@@ -31,8 +31,8 @@ module Rating
     end
 
     module ClassMethods
-      def rating
+      def rating(as: nil)
-        after_create { Rating.find_or_create_by resource: self }
+        after_create -> { Rating.find_or_create_by resource: self }, unless: -> { as == :author }
 
         has_many :rating_records,
           as:         :resource,

spec/factories/author.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :author do
+    sequence(:name) { |i| "Author #{i}" }
+  end
+end

spec/models/extension/after_create_spec.rb

@@ -3,10 +3,10 @@
 require 'rails_helper'
 
 RSpec.describe Rating::Extension, ':after_create' do
-  context 'when creates object' do
+  context 'with :as as nil' do
     let!(:user) { create :user }
 
-    it 'creates a record with zero values just to be easy to make the count' do
+    it 'creates a rating record with zero values just to be easy to make the count' do
       rating = Rating::Rating.find_by(resource: user)
 
       expect(rating.average).to   eq 0
@@ -17,4 +17,12 @@ RSpec.describe Rating::Extension, ':after_create' do
       expect(rating.total).to     eq 0
     end
   end
+
+  context 'with :as as :author' do
+    let!(:author) { create :author }
+
+    it 'does not creates a rating record' do
+      expect(Rating::Rating.exists?(resource: author)).to eq false
+    end
+  end
 end

spec/support/db/migrate/create_authors_table.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class CreateAuthorsTable < ActiveRecord::Migration[5.0]
+  def change
+    create_table :authors do |t|
+      t.string :name, null: false
+    end
+  end
+end

spec/support/migrate.rb

@@ -3,6 +3,7 @@
 require File.expand_path('../../lib/generators/rating/templates/db/migrate/create_rating_tables.rb', __dir__)
 
 CreateArticlesTable.new.change
+CreateAuthorsTable.new.change
 CreateCategoriesTable.new.change
 CreateRatingTables.new.change
 CreateUsersTable.new.change

spec/support/models/author.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class Author < ::ActiveRecord::Base
+  rating as: :author
+end