未定義的方法'find_by_targetable_id'rails活動

Question

我創建了一個活動模型，並試圖讓它在用戶刪除其活動時也刪除相應的狀態。刪除狀態時，我已經可以做到這一點，它會刪除活動，但不知道如何在相反的方向進行操作。我試圖通過targetable_id找到狀態，但我得到：

undefined method `find_by_targetable_id' for #<Class:0x8df4a70> 

Parameters: 

{"_method"=>"delete", 
"authenticity_token"=>"s2wKOZxCBVarT5uge3AIFNXHepFuvNGM+kU/q+ArOjA=", 
"id"=>"18"} 

如果你熟悉public_activity寶石則定位的是同樣的事情，可跟蹤並在這個例子中，活動ID是18和它對應的狀態ID是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

不應該在該行

@status = Activity.targetable 

是

@status = @activity.targetable 

？

第二個注意：它可能會更好地移動狀態摧毀Activity模型before_destroy回調。