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class AllowNullVersionEffectiveDate < ActiveRecord::Migration
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  def self.up
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    change_column :versions, :effective_date, :date, :default => nil, :null => true
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  end
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  def self.down


    		
  

  

    
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    raise IrreversibleMigration


    		
  

  

    
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  end


    		
  

  

    
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end