Rails - Mar 2009 - nil.errors and error_messages_for

Hi there

I''m wanting to re-render my index action in the event of an object not
getting saved; I use render not redirect so as to preserve the
validation errors.

I''m using the error_messages_for helper in my view but I get a
nil.errors error when I attempt to display the view.

I can avoid this error by setting up @discount = Discount.new in my
index action, but this obliterates the instance variable with the
attached error messages.

I''m chasing my tail on this and any clues would be appreciated.
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bongoman wrote:
> I''m wanting to re-render my index action in the event of an object
not
> getting saved; I use render not redirect so as to preserve the
> validation errors.
> 
> I''m using the error_messages_for helper in my view but I get a
> nil.errors error when I attempt to display the view.
> 
> I can avoid this error by setting up @discount = Discount.new in my
> index action, but this obliterates the instance variable with the
> attached error messages.
> 
> I''m chasing my tail on this and any clues would be appreciated.
Hear galloping think horses not zebras, here...

Your action goes like...

  @discount = Discount.new(params[:discount]) # warning use attr_protected!
  unless @discount.save
    render :action => ''index''
  end

So... uh... @discount indeed contains a stuffed Discount instance with populated
errors... so what''s the problem??

So post your actual action instead of making us guess? (-8


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> So... uh... @discount indeed contains a stuffed Discount instance
with populated
> errors... so what''s the problem??
Well it only does when the index template is rendered AFTER validation
fails. The same action gets invoked prior to the form submission at
which point in time there is no @discount variable, hence the
nil.errors
> So post your actual action instead of making us guess? (-8
Here we go:

    @discount = Discount.find(params[:id])
    if @discount.update_attributes(params[:discount])
      flash[:notice_good] = "Discounts have been updated"
      redirect_to :action=> ''index''
    else
      index # I need to do this in order to get my instance variables
populated for the index view
      render :action => ''index''
    end

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> Here we go:
> 
>     @discount = Discount.find(params[:id])
>     if @discount.update_attributes(params[:discount])
>       flash[:notice_good] = "Discounts have been updated"
>       redirect_to :action=> ''index''
>     else
>       index # I need to do this in order to get my instance variables
> populated for the index view
and ... index re-populates @discount?

put this inside the index:

   @discount ||= Discount.new
>       render :action => ''index''
>     end

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