Button call controller method, display results - ruby-on-rails

Question

I have resources
User #from devise
Stream
Subscription
In my routes.rb file I have subscriptions as a nested resource to users.
resources :users do
resources :subscriptions
end
In Stream#show view I have a button that should save the #stream.title to #subscription.title.
<%= button_to "Subscribe", subscriptions_path(#subscription), :class => "button", :method => :post , :remote=>true %>
In my Subscriptions Controller
def create
#stream = Stream.friendly.find(params[:stream_id])
#subscription = current_user.subscriptions.create(subscription_params)
#subscription.title = #stream.title
#subscription.save
respond_to do |format|
if #subscription.save
format.html { redirect_to #subscription, notice: 'Subscription was successfully created.' }
format.json { render :show, status: :created, location: #subscription }
else
format.html { render :new }
format.json { render json: #subscription.errors, status: :unprocessable_entity }
end
end
end
Rake route
POST /users/:user_id/subscriptions(.:format) subscriptions#create
And in my Stream#index view I want to display the #subscription.title ' s
<tbody>
<% for subscription in #subscriptions %>
<tr>
<td><%= subscription.title %></td>
</tr>
<% end %>
And in my Streams Controller
def index
#streams = Stream.search(params)
#subscriptions = current_user.subscriptions.build(subscription_params)
end
I have added a reference index for each subscription to a user
class AddIndexes < ActiveRecord::Migration
def change
add_reference :subscriptions, :user, index: true
end
end
I am recieving a NoMethodError in Streams#show, undefined method 'subscriptions_path'.
And a NameError in StreamsController#index, undefined local variable or method 'subscription_params'

Answer 1

You get undefined method subscriptions_path because rails translates your format.html { redirect_to #subscription, notice: 'Subscription was successfully created.' } wrong. Change your #subscription into a proper helper path call. If you're not sure what you should provide here, you may want to run rake routes > routes.txt in the shell and find your subscriptions route definition there and call it with _path
You get undefined method subscription_params because most probably you haven't defined subscription_params anywhere. You most prolly want to access your subscription params like params[:subscription]. As for the proper key when it comes to accessing the params hash, it all depends how you build your form in a view.

Answer 2

<%= button_to "Subscribe", subscriptions_path(#subscription), :class => "button", :method => :post , :remote=>true %>
The resource above doesnt exists, you have only defined a nested resource subscriptions inside users.
So you should have something like this instead, using the nested resource user_subscriptions_path.
<%= button_to "Subscribe", user_subscriptions_path(#subscription), :class => "button", :method => :post , :remote=>true %>