discourse/db/migrate/20130903154323_allow_null_u...

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class AllowNullUserIdOnPosts < ActiveRecord::Migration
def up
change_column :posts, :user_id, :integer, null: true
execute "UPDATE posts SET user_id = NULL WHERE nuked_user = true"
remove_column :posts, :nuked_user
end
def down
add_column :posts, :nuked_user, :boolean, default: false
change_column :posts, :user_id, :integer, null: false
end
end