Nevermind -- I've found the answer. The link_to should be coded as:
<%= link_to 'Add a payment', new_deposit_payment_path(@deposit)
%>
For me, magic is often hard to follow.
On Jan 6, 9:18 am, POOCH <pooc...@gmail.com> wrote:
> Hi,
>
> I'm building my first Rails application and have hit a problem using
> sub-resources.
>
> My model includes a Deposit that has_many Payments. So routes.rb has
> a line:
>
> map.resources :deposits, :has_many => :payments
>
> I've generated the scaffolding for Payments and I am able to go from a
> particular Deposit to a page where I want to show its list of
> Payments. The index.html.erb for Payments begins with these 2 lines:
>
> <h2>Payments for deposit <%= @deposit.deposit_date %> : <%=
> @deposit.name %></h2>
>
> <%= link_to 'Add a payment', new_payment_path(@deposit) %>
>
> The references to @deposit in the first line are resolved correctly,
> but not so on the second line. When trying to render the index, the
> error messages I get are:
>
> NoMethodError in Payments#index
> You have a nil object when you didn't expect it!
> The error occurred while evaluating nil.to_sym
>
> This at first made me think that @deposit was nil when the second line
> was parsed, but now I think that the first error line is more to the
> point -- there isn't a new_payment_path method that takes a Deposit as
> a parameter. But I need to pass in the parent Deposit on the page
> where I will be creating a child Payment, so how can I do that?
>
> When I remove the @deposit parameter from new_payment_path, the page
> renders fine, but when I click the Add a Payment link, the page it
> goes to ishttp://localhost:3000/payments/new, with no reference to
> the parent Deposit.
>
> So how do I pass in the parent when creating the child?
>
> Thanks!
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