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%= table_name.camelize %> < ActiveRecord::Migration def self.up change_table(:<%= table_name %>) do |t| t.database_authenticatable :null

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down() click to toggle source 
# File lib/generators/active_record/templates/migration_existing.rb, line 29
def self.down
  # By default, we don't want to make any assumption about how to roll back a migration when your
  # model already existed. Please edit below which fields you would like to remove in this migration.
  raise ActiveRecord::IrreversibleMigration
end

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