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class ReorderCooImgPosition < ActiveRecord::Migration[5.2]
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def change
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CooImg.all.group_by(&:img_type).each do |_type, objs|
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objs.sort_by(&:position).each_with_index do |obj, index|
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obj.update!(position: index + 1)
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end
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end
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end
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end
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