discourse/db/migrate/20130616082327_create_optimized_images.rb

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class CreateOptimizedImages < ActiveRecord::Migration[4.2]
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def up
create_table :optimized_images do |t|
t.string :sha, null: false
t.string :ext, null: false
t.integer :width, null: false
t.integer :height, null: false
t.integer :upload_id, null: false
end
add_index :optimized_images, :upload_id
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add_index :optimized_images, [:upload_id, :width, :height], unique: true
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end
def down
drop_table :optimized_images
end
end