discourse/db/migrate/20190418113814_add_unique_index_to_group_requests.rb
Sam Saffron 30990006a9 DEV: enable frozen string literal on all files
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.

Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
2019-05-13 09:31:32 +08:00

9 lines
309 B
Ruby

# frozen_string_literal: true
class AddUniqueIndexToGroupRequests < ActiveRecord::Migration[5.2]
def change
execute "DELETE FROM group_requests WHERE id NOT IN (SELECT MIN(id) FROM group_requests GROUP BY group_id, user_id)"
add_index :group_requests, [:group_id, :user_id], unique: true
end
end