lib/tasks/membership.rake
namespace :membership do
desc "Removes invalid/orphaned memberships from Projects"
task remove: :environment do
p Membership.where.not(user_id: User.pluck(:id))
Membership.where.not(user_id: User.pluck(:id)).destroy_all
Membership.where.not(project_id: Project.pluck(:id)).destroy_all
end
end