Velocipede's User, Sales, and Bike Inventory Web App
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628 B

class ChangeBikeShopId < ActiveRecord::Migration
# We don't use change_column because we have arbitrary strings we
# need to strip the characters from to make the integer values
def up
bikes = Bike.all
remove_column :bikes, :shop_id
add_column :bikes, :shop_id, :integer, :unique => true
# deconflict shop ids
bikes.each do |bike|
new_id = bike.shop_id.gsub(/[^\d]/, '').to_i rescue 1
while bikes.map(&:shop_id).include? new_id
new_id += 1
end
bike.shop_id = new_id
end
bikes.each(&:save)
end
def down
change_column :bikes, :shop_id, :string
end
end