Hi! I feel stupid for having to ask this, but I have never run into this before... I have this code that should send an email when someone upgrades their account. I am using this code: new_plan = Plan.find(params[:customer][:plan_id]) previous_plan = @customer.plan @customer.change_plan(new_plan) @customer.save! ElectronicMailer.deliver_notify_upgrade(@customer.name, @customer.url, @customer.plan.name, previous_plan.name, @customer.billing_id, @customer.start_date) # if new_plan.price > previous_plan.price The problem is an email never gets send, because new_plan.price is always equal to previous_plan.price, so it apparently previous_plan holds a reference to the customer's plan and when I change that, previous_plan changes too. When I change: previous_plan = @customer.plan to: previous_plan = Plan.find(@customer.plan_id) it does work, but it feels like I don't need the extra find... How would you guys do this? Thanks, Mischa.
on 2007-07-01 11:56
on 2007-07-01 13:14
Yes, previous_plan is a reference to @customer_plan and so changes with it. Instead of > previous_plan = @customer.plan This should work with something like previous_plan = @customer.plan.dup Which makes previous_plan a copy rather than a reference. Though not a huge deal, this to me is one of the more annoying and confusing bits of Ruby. It uses references in many places where I'd think it would just copy values. And the difference between dup and clone is poorly documented or mysterious or both.