discourse/db/migrate/20190418113814_add_unique_i...

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# 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, %i[group_id user_id], unique: true
end
end