Test moderation of fields of an associated model

spec/internal/app/models/category.rb

@@ -1,3 +1,4 @@
 class Category < ActiveRecord::Base
   has_one :page
+  accepts_nested_attributes_for :page
 end

spec/internal/app/models/page.rb

@@ -1,4 +1,6 @@
 class Page < ActiveRecord::Base
   has_many :links
+  accepts_nested_attributes_for :links
+
   belongs_to :category
 end

spec/the_moderator/model_spec.rb

@@ -1,24 +1,40 @@
 require 'spec_helper'
 
 describe TheModerator::Model do
-  subject { Page.new(name: 'Name', content: 'Content') }
-
   describe '#moderate' do
     it 'moderates simple field' do
-      subject.moderate(:name)
+      page = Page.new(name: 'Name', content: 'Content')
+      page.moderate(:name)
 
-      expect(subject.moderations).to have(1).moderation
-      expect(subject.name).to be_nil
-      expect(subject.content).to eq('Content')
+      expect(page.moderations).to have(1).moderation
+      expect(page.moderations.first.data[:attributes]).to include(name: 'Name')
+      expect(page.name).to be_nil
+      expect(page.content).to eq('Content')
+    end
+
+    it 'moderates association fields' do
+      category = Category.new(name: 'category')
+      category.create_page
+      category.save
+
+      category.attributes = {page_attributes: {
+        name: 'name', content: 'content', id: category.page.id}}
+      category.moderate(page: :name)
+
+      expect(category.moderations).to have(1).moderation
+      expect(category.moderations.first.data[:attributes])
+        .to include(page_attributes: {name: 'name', id: category.page.id})
+      expect(category.page.name).to be_nil
     end
   end
 
   describe '#moderated?' do
     it 'detects moderated field' do
-      subject.moderate(:name)
+      page = Page.new(name: 'Name', content: 'Content')
+      page.moderate(:name)
 
-      expect(subject.moderated?(:name)).to be_true
-      expect(subject.moderated?(:content)).to be_false
+      expect(page.moderated?(:name)).to be_true
+      expect(page.moderated?(:content)).to be_false
     end
   end
 end