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POMake Rails controller actions atomic?
 

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    <p>Sometime one in a long series of events within a controller action fails. For example, a credit card is processed but then an ActiveRecord query times out. Is there any way to make those calls reversible?</p> <p>E.g. with this controller action:</p> <pre><code>def process_order cart = Cart.new(params[:cart]) load_order response = credit_card.charge if response submit_order order.receipt = Pdf.new(render_to_string(:partial =&gt; 'receipt') order.receipt.pdf.generate order.receipt.save render :action =&gt; 'finished' else order.transaction = response @message = order.transaction.message order.transaction.save render :action =&gt; 'charge_failed' end end </code></pre> <p>I would like to be able to put a block around it like so:</p> <pre><code>def process_order transaction cart = Cart.new(params[:cart]) load_order response = credit_card.charge if response submit_order order.receipt = Pdf.new(render_to_string(:partial =&gt; 'receipt') order.receipt.pdf.generate order.receipt.save render :action =&gt; 'finished' else order.transaction = response @message = order.transaction.message order.transaction.save render :action =&gt; 'charge_failed' end rollback credit_card.cancel_charge ... end end </code></pre> <p>This is just a contrived example and I'm not really sure how it would work in practice. What typically happens is we get an exception like <code>ActiveRecord::StatementInvalid: : execution expired</code> for the line with <code>submit_order</code> and then we have to go and manually run the rest of the lines that should have run. </p>
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