Add post updates

spec/factories/comments.rb

@@ -4,5 +4,6 @@ FactoryBot.define do
     user
     post
     parent { nil }
+    is_post_update { false }
   end
 end

spec/models/comment_spec.rb

@@ -41,4 +41,10 @@ RSpec.describe Comment, type: :model do
 
     expect(parent.children.length).to eq(2)
   end
+
+  it 'has a flag to tell if it is a post update that defaults to false' do
+    comment = Comment.new
+    
+    expect(comment.is_post_update).to be_falsy
+  end
 end