Rails%203%20In%20Action

Using JavaScript
The element this updates doesn’t currently exist, but you can easily create it by
wrapping the fields_for inside a div with the id attribute set to files, as shown in
the following listing.
Listing 9.14 app/views/tickets/_form.html.erb
number do |asset| %>
This div tag provides an element for your new link_to to insert a file field into. If you
run this scenario with bin/cucumber features/creating_tickets.feature:36, the
step that follows the Add Another File link passes, but the file field is still not visible:
And I follow "Add another file"
And I attach the file "spec/fixtures/spin.txt" to "File #2"
cannot attach file, no file field with id, name, or label 'File #2'
The Add Another File link currently uses the new_file_path helper, which generates
a route such as /files/new. This route points to the new action in FilesController.
This action isn’t defined at the moment, so the feature won’t work. Therefore, the
next step is to define the action you need.
9.4.4 Responding to an asynchronous request
The job of the new action inside the FilesController is to render a single file field
for the ticket form so users may upload another file. This action needs to render the
fields for an asset, which you already do inside app/views/tickets/_form.html.erb by
using these lines:
To re-use this code for the new action in FilesController, move it into a partial
located at app/views/files/_form.html.erb.
In app/views/tickets/_form.html.erb, you can replace the lines with this simple
line:
"files/form",
:locals => { :number => number } %>
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