Ruby on Rails

On 20 August 2014 08:44, Jaimin Pandya <lists@ruby-forum.com> wrote:
> ...
>>>After creating association, when I click on "Add to count" button, I got error
> like:
>
> ActionController::ActionControllerError (Cannot redirect to nil!):
>
> app/controllers/line_items_controller.rb:54:in `block (2 levels) in
> create'
>
> app/controllers/line_items_controller.rb:51:in `create'
>
>>> Code of line_items_controller.rb :
>
> def create
> @expensescounter = current_expensescounter
> quantity = Quantity.find(params[:quantity_id])
> @line_item = @expensescounter.add_quantity(quantity.id)
> @line_item.quantity = quantity
>
> respond_to do |format| #line no. : 51
> if @line_item.save
> format.html { redirect_to @line_item.expensescounter } #line no. :
> 54
> .
> end
>
> How can I solve this problem?

By doing some debugging. The error indicates that
@lineitem.expensescounter is nil (the clue is that it says cannot
redirect to nil) so you must find why this is the case. Look in your
code to see where you set that up and work out why it is nil. A
simple way of debugging to to insert lines like
logger.info( some_expression )
which will insert text into development.log (and in the server
window). You can use that to look at values and work out what is
going wrong.

Colin

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