elasticsearch-rails/lib/rails/templates/03-expert.rb [138:147]:
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insert_into_file "app/models/article.rb", after: "ActiveRecord::Base" do
  <<-CODE

  has_and_belongs_to_many :categories, after_add:    [ lambda { |a,c| Indexer.perform_async(:update,  a.class.to_s, a.id) } ],
                                       after_remove: [ lambda { |a,c| Indexer.perform_async(:update,  a.class.to_s, a.id) } ]
  has_many                :authorships
  has_many                :authors, through: :authorships
  has_many                :comments
  CODE
end
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elasticsearch-rails/lib/rails/templates/03-expert.rb [186:196]:
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insert_into_file "app/models/article.rb", after: "ActiveRecord::Base" do
  <<-CODE

  has_and_belongs_to_many :categories, after_add:    [ lambda { |a,c| Indexer.perform_async(:update,  a.class.to_s, a.id) } ],
                                       after_remove: [ lambda { |a,c| Indexer.perform_async(:update,  a.class.to_s, a.id) } ]
  has_many                :authorships
  has_many                :authors, through: :authorships
  has_many                :comments

  CODE
end
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