## mark a section (Learn more)

class AddOpenForComments < ActiveRecord::Migration def self.up Article.find_all.each do |article| if article.comments.size == 0 Comment.new do |comment| comment.name = 'Welcome.' comment.body = "Article '#{article.name}' is open for comments." article.comments << comment comment.save article.save end end end end def self.down end end

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