You’re getting no method error “qty” because @product is not set in your controller action. So you’re essentially trying to subtract @taken from something that is NIL.
You need to see @product as an instance variable in your specific controller method and this should work out for you. -James > On Mar 5, 2017, at 12:23 PM, Joe Guerra <[email protected]> wrote: > > ok, here's my method... > > def calc_remaining > @taken = Cart.where('product_id' => @product).count > > @remaining = @product.qty - @taken > end > > but when I call it from my add to cart method, @product.qty is undefined > method `qty' for nil:NilClass. > > > > On Thursday, March 2, 2017 at 11:07:06 AM UTC-5, Joe Guerra wrote: > In my show method for my products controller I've got a variable that track > qty ( @remaining ). > > Can I access this variable from another method within the same controller? > > Thanks, > Joe > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/14870fab-2fc6-421f-9e1c-677a2001dac5%40googlegroups.com > > <https://groups.google.com/d/msgid/rubyonrails-talk/14870fab-2fc6-421f-9e1c-677a2001dac5%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/A447437A-F1A5-4CCF-BFCF-D04FD549D5CF%40gmail.com. For more options, visit https://groups.google.com/d/optout.
