Undefined method 'find_by_targetable_id' rails activity - ruby-on-rails

Question

I've created an activity model and I'm trying to have it so that when a user deletes their activity it also deletes the corresponding status. I've been able to do it when deleting the status, it deletes the activity but not sure how to do it in the opposite direction. I tried finding the status by targetable_id but I get:
undefined method `find_by_targetable_id' for #<Class:0x8df4a70>
Parameters:
{"_method"=>"delete",
"authenticity_token"=>"s2wKOZxCBVarT5uge3AIFNXHepFuvNGM+kU/q+ArOjA=",
"id"=>"18"}
If you're familiar with the public_activity gem then targetable is the same thing as trackable and in this example, the activity id is 18 and it's corresponding status id is 53
ActivitiesController
class ActivitiesController < ApplicationController
before_filter :authenticate_member!, only: [:destroy]
before_filter :find_activity, only: [:destroy]
def index
following_ids = current_member.following_members.map(&:id)
#activities = Activity.where("member_id in (?)", following_ids.push(current_member.id)).order("created_at desc").all
end
def destroy
#status = Activity.targetable
if #status
#status.destroy
end
#activity.destroy
respond_to do |format|
format.html { redirect_to :back }
format.json { head :no_content }
end
end
private
def find_activity
#activity = current_member.activities.find(params[:id])
end
end
StatusesController
class StatusesController < ApplicationController
before_filter :authenticate_member!, only: [:new, :create, :edit, :update, :destroy]
before_filter :find_member
before_filter :find_status, only: [:edit, :update, :destroy, :show]
rescue_from ActiveRecord::RecordNotFound do
render file: 'public/404', status: 404, formats: [:html]
end
# GET /statuses
# GET /statuses.json
def index
#statuses = Status.order('created_at desc').all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #statuses }
end
end
# GET /statuses/1
# GET /statuses/1.json
def show
respond_to do |format|
format.html # show.html.erb
format.json { redirect_to profile_path(current_member) }
end
end
# GET /statuses/new
# GET /statuses/new.json
def new
#status = Status.new
#status.build_document
respond_to do |format|
format.html # new.html.erb
format.json { render json: #status }
end
end
# GET /statuses/1/edit
def edit
end
# POST /statuses
# POST /statuses.json
def create
#status = current_member.statuses.new(params[:status])
respond_to do |format|
if #status.save
current_member.create_activity(#status, 'created')
format.html { redirect_to :back }
format.json
else
format.html { redirect_to profile_path(current_member), alert: 'Post wasn\'t created. Please try again and ensure image attchments are under 10Mbs.' }
format.json { render json: #status.errors, status: :unprocessable_entity }
end
end
end
# PUT /statuses/1
# PUT /statuses/1.json
def update
if params[:status] && params[:status].has_key?(:user_id)
params[:status].delete(:user_id)
end
respond_to do |format|
if #status.update_attributes(params[:status])
format.html { redirect_to profile_path(current_member), notice: 'Status was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #status.errors, status: :unprocessable_entity }
end
end
end
# DELETE /statuses/1
# DELETE /statuses/1.json
def destroy
#activity = Activity.find_by_targetable_id(params[:id])
if #activity
#activity.destroy
end
#status.destroy
respond_to do |format|
format.html { redirect_to :back }
format.json { head :no_content }
end
end
private
def find_member
#member = Member.find_by_user_name(params[:user_name])
end
def find_status
#status = current_member.statuses.find(params[:id])
end
def sortable_date
created_at
end
end

Answer 1

Should not this line
#status = Activity.targetable
be
#status = #activity.targetable
?
Second note: it probably will be better to move status destroying to Activity model before_destroy callback.