Submit Form and Create action for a Polymorphic Association - ruby-on-rails

Question

I received help Setting up a polymorphic association
I am now having trouble implementing the submit form and create action. A user just needs to follow and unfollow each model.
In my Follow Controller
class FollowsController < ApplicationController
before_filter :find_supports
def create
#relation = find_supports
#follow = #relation.find(params[:follow])
current_user.follows.follow!(#follow)
respond_to do |format|
format.html { redirect_to :back }
format.js
end
end
def destroy
#follows = Follow.find(params[:id]).followable
current_user.unfollow!(#follows)
respond_to do |format|
format.html { redirect_to :back }
format.js
end
end
private
def find_supports
params.each do |name, value|
if name =~ /(.+)_id$/
return $1.classify.constantize.find(value)
else
nil
end
end
end
end
In my Follow Form, which is rendered at on my polymorphic models
EDIT
<%= form_for #cause.follows.build(params[:follow]) do |f| %>
<div><%= f.hidden_field :followable_id %></div>
<div><%= f.hidden_field :followable_type %></div>
<div><%= f.hidden_field :follower_id %></div>
<div class="create-button"><%= f.submit "Follow" %></div>
<% end %> <!-- I now get the values for followable_id and followable_type, but it
wont get grab the follower_id and I get an error in the create action -->
and in my User Model, I have these 3 methods
def following?(follow)
follows.find_by_followable_id(follow)
end
def follow!(followable)
follows.create![] ##I have tried many different params here
end
def unfollow!(followable)
follows.destroy(params[:followable_id]).destroy
end
I cannot get the follower_id, followable_id and followable_type to save properly. Any suggestions?
Thanks in advance, I have spent many hours with this.

Answer 1

Here is how I solved my issues. The answer is using AJAX and Devise helper method current_user
Form Partial
<%= form_for #relation.supports.build(params[:support]), :remote => true do |f| %>
<div><%= f.hidden_field :supporter_id, :value => current_user.id %></div>
<div><%= f.hidden_field :supportable_id %></div>
<div><%= f.hidden_field :supportable_type %></div>
<%= f.submit "Support", :class => "support-button" %>
<% end %>
My Controller
class SupportsController < ApplicationController
before_filter :find_relation
def create
#relation.supports.create!(params[:support])
respond_to do |format|
format.html { redirect_to :back }
format.js
end
end
def destroy
#relation.supports.find(params[:id]).destroy
respond_to do |format|
format.html { redirect_to :back }
format.js
end
end
private
def find_supports(instance_params)
class_name = instance_params["supportable_type"].classify.constantize
class_name.find(instance_params["supportable_id"])
end
def find_relation
#relation = find_supports(params[:support])
end
end
Also, add a before_filter in all the controllers that render the form to find the correct object. This will allow you use the same form partial with all your polymorphic classes.
def find_supports
#relation = YourClass.find(params[:id])
end