method chaining and RJS templates...

rubyonrails-talk
1

Because the action is “remove_from_cart” (see params[:action]), and that’s what Rails uses to find the view to use. Do this:

class SomeController < ApplicationController def remove_from_cart if quantity <= 0 empty_cart render :partial => “empty_cart” else foo end end

Jason

2

Sorry, hit Send too quickly.

You can also do, instead of the above :

def empty_cart render :partial => “empty_cart” end

as long as there is no render call in remove_from_cart. Otherwise you’ll get an error along the lines of “can’t render more than once”.

Jason

3

Ah, if you do :partial => “empty_cart”, then the file Rails looks for is _empty_cart.rjs (note the beginning underscore).

Can you just do render “empty_cart” ?

Jason

4

Sorry, but that’s not how Rails works. It doesn’t figure out the view from the function being ran, but from the request from the client. E.g.

www.host.com/users/login

becomes:

params = { :controller => “users”, :action => “login” }

And thus, if there is no explicit render call in UsersController#login, then Rails looks for login.rhtml / login.rxml / login.rjs

What you can do is an explicit render call as such:

class SomeController < ApplicationController def remove_from_cart if quantity <= 0 render :action => “empty_cart”

else
  foo
end

end

def empty_cart does_something_here end end

But that only tells Rails what view to look for, it doesn’t actually call SomeController#empty_cart, so the “does_something_here” won’t actually get done, but you will get “empty_cart.rhtml” to render.

From what I’ve gathered from your code and responses, I would say this is your best bet:

class SomeController < ApplicationController def remove_from_cart if quantity <= 0 empty_cart render :partial => “empty_cart” else foo end end

def empty_cart does_something_here end end

and then have a view file under views/some_controller/_empty_cart.rjs.

Hope that helps.

Jason

5

What about:

def empty_cart session[:cart] = nil render :partial => “empty_cart” end

then you just need _empty_cart.rjs and can get rid of empty_cart.rjs.

You do make a lot of view files when you start dealing with AJAX and RJS, it’s just how Rails is. But you can call any view file from any controller through the #render method.

It’s also possible to run RJS code in your controller, like so:

def empty_cart session[:cart] = nil render_update do |page| page.visual_effect :puff end end

but I’m not a fan of this as it starts to muddle the line between View and Controller.

Jason