discourse/db/migrate/20180920042415_create_user_...

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# frozen_string_literal: true
class CreateUserUploads < ActiveRecord::Migration[5.2]
def up
create_table :user_uploads do |t|
t.integer :upload_id, null: false
t.integer :user_id, null: false
t.datetime :created_at, null: false
end
add_index :user_uploads, %i[upload_id user_id], unique: true
execute <<~SQL
INSERT INTO user_uploads(upload_id, user_id, created_at)
SELECT id, user_id, COALESCE(created_at, current_timestamp)
FROM uploads
WHERE user_id IS NOT NULL
SQL
end
def down
drop_table :user_uploads
end
end