Ruby on Rails

http://edgeapi.rubyonrails.org/classes/ActiveRecord/Transactions/ClassMethods.html under "Exception handling and rolling back" says that "One should restart the entire transaction if an ActiveRecord::StatementInvalid occurred." My question is how? I tried wrapping the statements in two separate transaction block but that still doesn't work. 

I have something like:

    self.transaction do
      bar = create!(params) rescue nil
    end
    unless bar
      self.transaction do
        bar = find_or_initialize_by(foo: foo)
        bar.update(params)
      end

    end

and PG would still complain about it with "PG::Error: ERROR: current transaction is aborted, commands ignored until end of transaction block". So my question is whether there is a proper way of restarting the transaction? Thanks!

Ken

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