23 lines
829 B
Ruby
23 lines
829 B
Ruby
|
class AddUrlToOptimizedImages < ActiveRecord::Migration
|
||
|
|
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
|