Ruby on Rails

def cart_params
  # params.fetch(:cart, {})
  params.require(:cart).permit(:user_id,  :product_id )


end
  

Have this in my controller.

def add_to_cart

  product_id = params['id']
  user_id = session['user_id']
  @cart = Cart.new(user_id, product_id)

end


Not sure what to put in the show page, to pass these values to the controller.  

I've got a few rails books, and not one of them cover this.  

Controller action methods do not take parameters. You get the parameters from the `params` hash. Also, as was mentioned, do not send user_id as a param. It is a security error, and you don't need to because you can access the session in the controller:

def add_to_cart

  product_id = params["product_id"]

  user_id = session["user_id"]
  @cart = Cart.new(user_id, product_id)

  ...

end

On Wednesday, February 15, 2017 at 5:11:02 PM UTC-7, Joe Guerra wrote:

I am pretty close to figuring this out...

I've got this in my product show page....I'm trying to pass user_id & product_id to my products controller, add_to_cart method...

<%= button_to  'Add to Cart', {:controller => "products", :action => "add_to_cart", :user_id=> session[:user_id], :product_id => @id   } , :method=>:post  %>

on the controller...

def add_to_cart(user_id, product_id)


    @cart = Cart.new(user_id, product_id )
#

end

I get the error, 
  
"wrong number of arguments (given 0, expected 2)"


Any suggestions?
Thanks,
Joe