Rails - Jun 2009 - routing woes.

I am getting this error following an update:


 currency_url failed to generate from
{  :action=>"show",
   :id=>#<Currency id: 138, currency_code: "", currency_name:
"",...,
changed_by: "not available">
:controller=>"currencies"},

expected:
{  :action=>"show", :controller=>"currencies"},

diff:
{  :id=>#<Currency id: 138, currency_code: "", currency_name:
"",...,
changed_by: "not available">} (ActionController::RoutingError)

Now, this particular model has the to_params methiod defined::

  def to_param
    currency_code
  end

So, I am wondering if this has anything to to with my difficulty.  The
routing for this controller is:


  map.resources :currencies

And the update method simply does this:

...
      if @currency.save
        flash[:notice] = ''Currency was successfully updated.''
        format.html { redirect_to(@currency) }
...

So, what am I doing wrong?
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James Byrne wrote:
> I am getting this error following an update:
...
> So, what am I doing wrong?
Bad data in DB and no check for nil in view.
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