Ruby on Rails

On 5 March 2017 at 19:03, Joe Guerra <JGuerra@jginfosys.com> wrote:
> it is set up in the private section
>
> def set_product
> @product = Product.find(params[:id])
> end
>
>
> and I can see it in my show method...
>
>
> How do I get to see it in my
>
>
> def calc_remaining
> @taken = Cart.where('product_id' => @product).count
> @remaining = @product.qty - @taken
> end
>
> method?

Presumably you know which product you are talking about in that
method, that is what it should be.

Colin

>
>
>
>
> On Sunday, March 5, 2017 at 1:57:39 PM UTC-5, James Jelinek wrote:
>>
>> 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 <jgu...@jginfosys.com> 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
>>
>>
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