osem-fcy/db/migrate/20170316042351_add_comment_count_to_events.rb

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class AddCommentCountToEvents < ActiveRecord::Migration
def up
add_column :events, :comments_count, :integer, default: 0
Event.reset_column_information
Event.find_each do |event|
event.update_attribute :comments_count, event.comment_threads.length
end
end
def down
remove_column :events, :comments_count
end
end