How to render polymorphic comment partial in feed? - ruby-on-rails

Question

I created a feed following http://railscasts.com/episodes/406-public-activity?view=asciicast.
In that feed I'd like it to say,
"User Name" added/updated value "Value Name" with the comment "Comment Content".
This partial creates the "Value Name" part:
views/public_activity/comment/_create.html.erb
added value
<% if activity.trackable %>
<b><%= link_to activity.trackable.name, activity.trackable %></b>
<% else %>
which has since been removed
<% end %>
This partial creates the "Comment Content" part:
views/public_activity/valuation/_create.html.erb
with the comment
<% if activity.trackable %>
<%= link_to activity.trackable.content %>
<% else %>
which has since been removed
<% end %>
If I add name or content to either one of the partials I am given an undefined method error message. What code would I need to add to their controllers or application controller to make something like this work?
Ideally, with the comment "Comment Content". would only be generated in instances where a comment is created so that, with the comment, wouldn't be left hanging.
class CommentsController < ApplicationController
before_action :load_commentable
before_action :set_comment, only: [:show, :edit, :update, :destroy]
before_action :logged_in_user, only: [:create, :destroy]
def index
#comments = #commentable.comments
end
def new
#comment = #commentable.comments.new
end
def create
#comment = #commentable.comments.new(comment_params)
if #comment.save
#comment.create_activity :create, owner: current_user
redirect_to #commentable, notice: "comment created."
else
render :new
end
end
def edit
#comment = current_user.comments.find(params[:id])
end
def update
#comment = current_user.comments.find(params[:id])
if #comment.update_attributes(comment_params)
redirect_to #commentable, notice: "Comment was updated."
else
render :edit
end
end
def destroy
#comment = current_user.comments.find(params[:id])
#comment.destroy
#comment.create_activity :destroy, owner: current_user
redirect_to #commentable, notice: "comment destroyed."
end
private
def set_comment
#comment = Comment.find(params[:id])
end
def load_commentable
resource, id = request.path.split('/')[1, 2]
#commentable = resource.singularize.classify.constantize.find(id)
end
def comment_params
params.require(:comment).permit(:content, :commentable)
end
end
class ValuationsController < ApplicationController
before_action :set_valuation, only: [:show, :edit, :update, :destroy]
before_action :logged_in_user, only: [:create, :destroy]
def index
if params[:tag]
#valuations = Valuation.tagged_with(params[:tag])
else
#valuations = Valuation.order('RANDOM()')
end
end
def show
#valuation = Valuation.find(params[:id])
#commentable = #valuation
#comments = #commentable.comments
#comment = Comment.new
end
def new
#valuation = current_user.valuations.build
end
def edit
end
def create
#valuation = current_user.valuations.build(valuation_params)
if #valuation.save
redirect_to #valuation, notice: 'Value was successfully created'
else
#feed_items = []
render 'pages/home'
end
end
def update
if #valuation.update(valuation_params)
redirect_to #valuation, notice: 'Value was successfully updated'
else
render action: 'edit'
end
end
def destroy
#valuation.destroy
redirect_to valuations_url
end
private
def set_valuation
#valuation = Valuation.find(params[:id])
end
def correct_user
#valuation = current_user.valuations.find_by(id: params[:id])
redirect_to valuations_path, notice: "Not authorized to edit this valuation" if #valuation.nil?
end
def valuation_params
params.require(:valuation).permit(:name, :private_submit, :tag_list, :content, :commentable, :comment)
end
end
class ApplicationController < ActionController::Base
include PublicActivity::StoreController
#before_action :load_todays_habits
before_action :set_top_3_goals
before_action :randomize_value
before_action :set_stats
protect_from_forgery with: :exception
include SessionsHelper
def set_top_3_goals
#top_3_goals = current_user.goals.unaccomplished.top_3 if current_user
end
def randomize_value
#sidebarvaluations = current_user.valuations.randomize if current_user
end
def set_stats
#quantifieds = Quantified.joins(:results).all
#averaged_quantifieds = current_user.quantifieds.averaged if current_user
#instance_quantifieds = current_user.quantifieds.instance if current_user
end
hide_action :current_user
private
#def load_todays_habits
# #user_tags = current_user.habits.committed_for_today.tag_counts if current_user
# #all_tags = Habit.committed_for_today.tag_counts if current_user
#end
# Confirms a logged-in user.
def logged_in_user
unless logged_in?
store_location
flash[:danger] = "Please log in."
redirect_to login_url
end
end
end
Thank you so much for your time.