discourse/db/migrate/20130728172550_add_url_to_o...

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