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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
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