Question

I have a nested form in a Rails 3.1 app, using Cocoon gem.

In the child form, I have a link that, when clicked, should return the id of the child and pass it to a javascript function.

<%= form_for @parent do |f| %>
    parent fields...
    <%= f.fields_for :child  do |child| %>
    <%= link "run function", 'string-to-pass' => "#{child.id}" %>   
    child fields...
    <% end %>
<% end %>

What is the correct syntax to return a column variable from a nested record?

child.id returns undefined local variable or method "child"

I could define an @child variable in the parent controller, but how do I point it towards the child ID, rather than the parent ID?

I’m sure I’m missing something simple here, but I can’t see how this fits together?

Grateful for any suggestions or pointers to relevant information.

Thanks!

Answer 1

I would suggest doing something like: child.object.id

I haven’t tested it so please let me know if it works.

EDIT:
I have code like this in my view:

<%= f.fields_for :children do |child| %>
  <%= render "child_fields", :f => child %>
<% end %>

And then in _child_fields.html.erb:

<%= f.object.some_attribute %>
 and other view stuff

And this works.

Can you try adapting your code to be similar. One thing I just realized, in your fields_for you need to say:

<%= f.fields_for :children

rather than:

<%= f.fields_for :child

Assuming, of course that you have a one-to-many relation going on here.