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					@ -29,7 +29,7 @@ class ModifyMdAttachmentUrlForMdCotents < ActiveRecord::Migration[5.2]
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					    plats = PlatformSample.where(samples_type: ['introduction', 'knowledge'])
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					    plats.find_each do |p|
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					      p.update_column(:contents, p.introduction.gsub(") if p.introduction.present?
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					      p.update_column(:contents, p.contents.gsub(") if p.introduction.present?
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					    end
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					  end
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					end
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