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class AddCreatedAtToAllTables < ActiveRecord::Migration
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ActiveRecord::Base.connection.tables.each do |t|
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unless ActiveRecord::Base.connection.columns(t).collect {|c| c.name}.include?("created_at")
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add_column t.to_s, :created_at, :datetime
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ActiveRecord::Base.connection.tables.each do |t|
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unless ActiveRecord::Base.connection.columns(t).collect {|c| c.name}.include?("created_at")
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remove_column t.to_s, :created_at