class RemoveTableArticlePrices < ActiveRecord::Migration[4.2] def self.up puts "create columns in articles ..." add_column "articles", "clear_price", :decimal, :precision => 8, :scale => 2, :default => 0.0, :null => false add_column "articles", "gross_price", :decimal, :precision => 8, :scale => 2, :default => 0.0, :null => false add_column "articles", "tax", :float add_column "articles", "refund", :decimal, :precision => 8, :scale => 2, :default => 0.0, :null => false add_column "articles", "unit_quantity", :integer, :default => 1, :null => false add_column "articles", "order_number", :string add_column "articles", "created_at", :datetime add_column "articles", "updated_at", :datetime # stop auto-updating the timestamps to make the data-copy safe! Article.record_timestamps = false puts "now copy values of article_prices into new articles-columns..." Article.find(:all).each do |article| price = article.current_price article.update!(clear_price: price.clear_price, gross_price: price.gross_price, tax: price.tax, refund: price.refund, unit_quantity: price.unit_quantity, order_number: price.order_number, updated_at: price.updated_on, created_at: price.updated_on) end puts "delete article_prices, current_price attribute" drop_table :article_prices remove_column :articles, :current_price_id end def self.down add_column :articles, :current_price_id, :integer create_table "article_prices", :force => true do |t| t.integer "article_id", :default => 0, :null => false t.decimal "clear_price", :precision => 8, :scale => 2, :default => 0.0, :null => false t.decimal "gross_price", :precision => 8, :scale => 2, :default => 0.0, :null => false t.float "tax", :default => 0.0, :null => false t.decimal "refund", :precision => 8, :scale => 2, :default => 0.0, :null => false t.datetime "updated_on" t.integer "unit_quantity", :default => 1, :null => false t.string "order_number" end # copy data from article now into old ArticlePrice-object Article.find(:all).each do |article| price = ArticlePrice.create(:clear_price => article.clear_price, :gross_price => article.gross_price, :tax => article.tax, :refund => article.refund, :unit_quantity => article.unit_quantity, :order_number => article.order_number.blank? ? nil : article.order_number, :updated_on => article.updated_at) article.update_attribute(:current_price, price) price.update_attribute(:article, article) end # remove new columns remove_column "articles", "clear_price" remove_column "articles", "gross_price" remove_column "articles", "tax" remove_column "articles", "refund" remove_column "articles", "unit_quantity" remove_column "articles", "order_number" remove_column "articles", "created_at" remove_column "articles", "updated_at" end end