discourse/db/migrate/20130612200846_create_post_...

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class CreatePostUploadJoinTable < ActiveRecord::Migration[4.2]
def change
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create_table :posts_uploads, force: true, id: false do |t|
t.integer :post_id
t.integer :upload_id
end
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add_index :posts_uploads, :post_id
add_index :posts_uploads, :upload_id
add_index :posts_uploads, [:post_id, :upload_id], unique: true
end
end