File: 072_add_enumerations_position.rb

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class AddEnumerationsPosition < ActiveRecord::Migration[4.2]
  def self.up
    add_column(:enumerations, :position, :integer, :default => 1) unless Enumeration.column_names.include?('position')
    Enumeration.all.group_by(&:opt).each do |opt, enums|
      enums.each_with_index do |enum, i|
        # do not call model callbacks
        Enumeration.where({:id => enum.id}).update_all(:position => (i+1))
      end
    end
  end

  def self.down
    remove_column :enumerations, :position
  end
end