Question

所以我有两个模特：艺术家和艺术品。艺术家有一个：名称参数艺术家has_many艺术品和艺术品has_one艺术家。

我不明白为什么当我在艺术品索引中打电话给@ artworks.artiste.name时我有这个错误：

未定义的方法`艺术家＆＃39;

这是我的索引：

<div class="col-xs-12 col-md-6 col-xs-offset-0 col-md-offset-4 col-lg-offset-5">
          <p id="notice"><%= notice %></p>
          <h1><%= @artworks.artist.name %></h1>
            <% @artworks.each do |artwork| %>
            <div class="artwork-container">
              <div class="artwork-info">
                <span><%= artwork.title %></span>
                <p><%= artwork.description %></p>
                <span><%= artwork.price %></span>
                <span><%= link_to 'Edit', edit_artist_artwork_path(:artist, artwork) %></span>
                <span><%= link_to 'Destroy', artist_artwork_path(:artist, artwork), method: :delete, data: { confirm: 'Are you sure?' } %>
                </span>
              </div>
              <div class="artwork-photo-container">
              <div class="artwork-photo" style="background-image: url('<%= artwork.photo.url %>');"></div>
              </div>         
           </div>
        <% end %> 
      <br>
   <%= link_to 'New Artwork', new_artist_artwork_path %>
</div>

这是我的艺术品控制器：

class ArtworksController < ApplicationController
  before_action :set_artwork, only: [:show, :edit, :update, :destroy]

  # GET /artworks
  # GET /artworks.json
  def index
    @artworks = Artwork.all
  end

  # GET /artworks/1
  # GET /artworks/1.json
  def show
    @artwork = Artwork.find(params[:id])
  end

  # GET /artworks/new
  def new
    @artwork = Artwork.new
  end

  # GET /artworks/1/edit
  def edit
  end

  # POST /artworks
  # POST /artworks.json
  def create
    @artwork = Artwork.new(artwork_params)

    respond_to do |format|
      if @artwork.save
        format.html { redirect_to artist_artwork_url(:artist, @artwork), notice: 'Artwork was successfully created.' }
        format.json { render :show, status: :created, location: artist_artwork_url(:artist, @artwork) }
      else
        format.html { render :new }
        format.json { render json: @artwork.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /artworks/1
  # PATCH/PUT /artworks/1.json
  def update
    respond_to do |format|
      if @artwork.update(artworks_params)
        format.html { redirect_to artist_artworks_url(:artist, @artworks), notice: 'Artwork was successfully updated.' }
        format.json { render :show, status: :ok, location: artist_artwork_url(:artist, @artworks) }
      else
        format.html { render :edit }
        format.json { render json: @artwork.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /artworks/1
  # DELETE /artworks/1.json
  def destroy
    @artwork.destroy
    respond_to do |format|
      format.html { redirect_to artist_artworks_url(:artist, @artworks), notice: 'Artwork was successfully destroyed.' }
      format.json { head :no_content }
    end
  end



  private
    # Use callbacks to share common setup or constraints between actions.
    def set_artwork
      @artwork = Artwork.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def artwork_params
      params.require(:artwork).permit(:title, :description, :ref, :dateof, :price, :stock, :front, :photo, artist_attributes: [ :name, :surname])
    end
end

这些是我的2个型号：

class Artist < ActiveRecord::Base
    has_many :artworks
end

class Artwork < ActiveRecord::Base
    has_one :artist
    accepts_nested_attributes_for :artist
    has_attached_file :photo, default_url: "/images/:style/missing.png"
    validates_attachment_content_type :photo, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
    validates_attachment_presence :photo
    validates_presence_of :title, :description, :stock, :front, :price
end

Answer 1

将has_one :artist更改为belongs_to :artist。原因是has_one不存储id，因此这两个模型实际上没有任何关联。 belongs_to添加artist_id字段。

Answer 2

好的，我通过替换<h1><%= @artworks.artist.name %></h1>

解决了错误

<%= @artworks.first.artist %>

谢谢你

嵌套属性不在rails 4中工作

2 个答案: