Association polymorphe dans Ruby on Rails

Question

Ma tentative consiste à créer une association polymorphe pour les modèles Items et Venues qui ont une association avec Photos. J'ai d'abord utilisé Rails Best Practices - How do you design your model for multiple upload? mais ont quelques erreurs, voici mon code jusqu'à présent:

class Item < ActiveRecord::Base 
    has_many :photos, :as => :assetable, :class_name => "Item::Photo", :dependent => :destroy 
    accepts_nested_attributes_for :photos 

class Venue < ActiveRecord::Base 
    has_many :photos, :as => :assetable, :class_name => "Photo", :dependent => :destroy 
    accepts_nested_attributes_for :photos 

class Photo < ActiveRecord::Base 
    belongs_to :asset 
end 

class Asset < ActiveRecord::Base 
    has_many :photos 
    belongs_to :assetable, :polymorphic => true 
    delegate :url, :to => :attachment 
end 

class Venue::Photo < Asset 
    has_attached_file :attachment, 
    :styles => { 
     :large => "640x480", 
     :medium => "300x300", 
     :thumb => "100x100" 
    }, 
    :path => "/:style/:id/:filename" 
end 

class Item::Photo < Asset 
    has_attached_file :attachment, 
    :styles => { 
     :large => "640x480", 
     :medium => "300xa300", 
     :thumb => "100x100" 
    }, 
    :path => "/:style/:id/:filename" 

class VenuesController < ApplicationController 

# GET /venues 
# GET /venues.json 
def index 
    #@venues = Venue.all 
    params[:page] ||= 1 
    @venues = Venue.paginate(:page => params[:page]) 

    respond_to do |format| 
    format.html # index.html.erb 
    format.json { render json: @venues } 
    end 
end 

    # GET /venues/1 
    # GET /venues/1.json 
    def show 
    @venue = Venue.find(params[:id]) 

    respond_to do |format| 
     format.html # show.html.erb 
     format.json { render json: @venue } 
    end 
    end 

    # GET /venues/new 
    # GET /venues/new.json 
    def new 
    @venue = Venue.new 
    5.times do 
     @venue.assets.build 
    end 

    respond_to do |format| 
     format.html # new.html.erb 
     format.json { render json: @venue } 
    end 
    end 

    # GET /venues/1/edit 
    def edit 
    @venue = Venue.find(params[:id]) 
    5.times { @venue.assets.build } 
    end 

    # POST /venues 
    # POST /venues.json 
    def create 
    @venue = Venue.new(params[:venue]) 
    #@venue.tag_list ="asian, chinese" 

    respond_to do |format| 
     if @venue.save 
     format.html { redirect_to @venue, notice: 'Venue was successfully created.' } 
     format.json { render json: @venue, status: :created, location: @venue } 
     else 
     format.html { render action: "new" } 
     format.json { render json: @venue.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # PUT /venues/1 
    # PUT /venues/1.json 
    def update 
    @venue = Venue.find(params[:id]) 

    respond_to do |format| 
     if @venue.update_attributes(params[:venue]) 
     format.html { redirect_to @venue, notice: 'Venue was successfully updated.' } 
     format.json { head :no_content } 
     else 
     format.html { render action: "edit" } 
     format.json { render json: @venue.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # DELETE /venues/1 
    # DELETE /venues/1.json 
    def destroy 
    @venue = Venue.find(params[:id]) 
    @venue.destroy 

    respond_to do |format| 
     format.html { redirect_to venues_url } 
     format.json { head :no_content } 
    end 
    end 
end 

Le message d'erreur que je reçois le message d'erreur « attribut inconnu: assetable_id » lorsque je tente de modifier un lieu et « méthode non définie photos 'for nil: NilClass "lorsque j'essaie d'éditer un objet

Answer 1

Avez-vous configuré la base de données comme indiqué dans le guide?

Pourquoi avez-vous défini le modèle photo et has_many :photos?

Si vous avez les mêmes styles pour les photos, vous n'avez pas besoin de STI.