Question

I have project model that has many tasks. Both project and tasks can have many discussions, and therefore I made Discussions polymorphic model(see below).

I wish to be able to click the link and mark ‘discussion’ as finished.

The way I went on to do it is to make a custom action in the ‘discussion controller’ that changes the boolean value of the ‘finished’ attribute from false to true. How to make that link_to helper in the discussion show page succesfully route to that custom action in the discussions controller? Also, is this the best practice to do this?

Discussion model

  1 class Discussion < ActiveRecord::Base  
  4   belongs_to :user
  5   belongs_to :discussionable, :polymorphic => true 
 28 end

Project model

  1 class Project < ActiveRecord::Base 
  7   has_many :tasks, :dependent => :destroy
  8   has_many :discussions, :as => :discussionable, :dependent => :destroy
 24 end 

Task model

  1 class Task < ActiveRecord::Base          
  7   belongs_to :project      
 14   has_many :discussions, :as => :discussionable, :dependent => :destroy
 27 end

So far my link_to helper looks like below, but it doesnt work(doesnt strike the custom ‘finish’ action as I want)…

Discussion show

7   <%= link_to 'Finish discussion', polymorphic_path([@parent, @discussion]), :action => 'finish' %>

This is this custom finish action in discussion controller.(I have before_filter that defines this @discussion variable from params[:id])

 33   def finish
 34     if @discussion.update_attribute(:finished, true)
 35       flash[:notice] = "it worked"    
 36       else
 37       flash[:alert] = 'You must be an admin to do that'
 38     end
 39   end

I also haven’t fiddled with routes.rb, as I don’t know if I have to.

Routes.rb

  1 PrjctMngr::Application.routes.draw do                 
 13     
 14   # PROJECTS
 15   resources :projects do
 16     resources :tasks
 17     resources :discussions
 18   end
 19 
 20   # TASKS
 21   resources :tasks do
 22     resources :subtasks
 23     resources :discussions
 24   end
 31 
 32   # DISCUSSIONS
 33   resources :discussions do
 34     resources :comments    
 35   end
 36 
 37 end

Answer 1

 <%= link_to 'Finish discussion', polymorphic_path([@parent, @discussion], :action => 'finish'), :method => :put %>

action option is for the path helper, not tag helper 😉

all assuming you have route set up propery
#routes.rb
resources :tasks do 
  resources :discussions do
    put :finish, :on => :member
  end
end