2017-08-31 00:06:56 -04:00
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class AddUrlToOptimizedImages < ActiveRecord::Migration[4.2]
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2013-07-31 17:26:34 -04:00
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def up
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# add a nullable url column
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add_column :optimized_images, :url, :string
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# compute the url for existing images
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execute "UPDATE optimized_images
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SET url = substring(u.url from '^\/uploads\/[^/]+\/')
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|| '_optimized/'
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|| substring(oi.sha1 for 3) || '/'
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|| substring(oi.sha1 from 4 for 3) || '/'
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|| substring(oi.sha1 from 7 for 11) || oi.extension
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FROM optimized_images oi
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JOIN uploads u ON u.id = oi.upload_id
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WHERE optimized_images.id = oi.id;"
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# change the column to be non nullable
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change_column :optimized_images, :url, :string, null: false
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end
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def down
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remove_column :optimized_images, :url
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end
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end
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