Rails%203%20In%20Action

Subscribing to updates
Listing 12.9 app/helpers/tickets_helper.rb
def toggle_watching_button
text = if @ticket.watchers.include?(current_user)
"Stop watching this ticket"
else
"Watch this ticket"
end
button_to(text, watch_project_ticket_path(@ticket.project, @ticket))
end
On the final line of this method, you use a new method: button_to. This method
works in a similar fashion as link_to does, providing a user with an element to click to
go somewhere. In this case, the element is a button wrapped in a form that points to
the specified action. When the user clicks the button, it submits this form through a
POST request, with the only parameter passed through being params[:commit], which
contains the text of the button.
Inside the button_to, you use a new route helper that you haven’t defined yet.
When you run bin/cucumber features/watching_tickets.feature, it will complain
that this method is undefined when it tries to render the app/views/tickets/
show.html.erb page:
And I follow "Release date"
undefined method `watch_project_ticket_path' for ...
This route helper points to a specific action on a project’s ticket. You can define it in
config/routes.rb inside the resources :tickets block, which itself is nested inside
the resources :projects block, as shown in the following listing.
Listing 12.10 config/routes.rb
resources :projects do
resources :tickets do
collection do
get :search
end
member do
post :watch
end
end
end
B Define member route
The button_to’s purpose is to toggle the watch status of a single ticket, meaning you
want to define a member route B for your ticket resource. You put it inside the tickets
resource, nested under the projects resource, because for your watch action you want
to confirm that the person has permission to view this project. You define the route to
the watch action with post because button_to generates a form by default, and a
form’s HTTP method will default to POST.
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