gistfile1.rb

Hotspot::Page.where(page_type: 'Advertising').find_each do |row|
	button_type = case row.redirect_text
	                when nil, '' then 'full_screen'
	                when 'верх' then 'top_screen'
	                when 'центр' then 'middle_screen'
	                when 'низ' then 'bottom_screen'
                  else 'button_screen'
                end
  
  row.update_columns(redirect_text: '', button_type: button_type)
end