Ruby on rails RubyonRails-图像上传

我想向模型中添加图像。我让用户使用Desive进行设置，他们有很多正在销售的商品

我现在想向项目模型添加一组图像，但不确定这是否是最佳方法

我看了一个回形针，但只能做一个图像。还研究了载波，但不确定如何在现有模型上实现

这是我的一些代码

项目1.rb

项目\u controller.rb

Item/new.html.erb的表单

---

您只需要创建一个图像模型。并将与Item的关系设置为：Item有多个：images，images属于：Item

但是，是的，回形针是个好的开始

---

编辑：哦，欢迎Rails，你会发现一个很好的社区随时准备提供帮助。您可能会发现搜索“接受”的“嵌套属性”也很有用，这样您就可以将图像上载到项目表单中，并可以动态添加和删除项目表单上的图像。

谢谢您的回答。那么，我是否正确地假设我将创建与将项目与用户关联几乎相同的关联？我现在就去谷歌，搜索接受和cocoon的嵌套属性。是的，你是对的。一旦您知道我们已回答您的原始问题，请将此问题标记为已解决。如果你有新问题，就根据你的具体问题提出新问题。这正是我需要的。我明天会实施，看看进展如何。对于视图，是否可以使用@item.images.each访问它们，然后进行迭代？如果您想显示上载的图像，则必须使用@item.images.each do | image | end-我可以看看您如何将picture.url方法委托给您的图像，但由于它有很多，这将是相当棘手的

#app/models/item.rb
class Item < ActiveRecord::Base
   has_many :images
   accepts_nested_attributes_for :images
   validates :title, :price, :description, presence: true
end

#app/models/image.rb
class Image < ActiveRecord::Base
   belongs_to :item
   has_attached_file :picture
end

class ItemsController < ApplicationController
  before_action :findItem, only: [:edit, :update, :sold]

  def index
    @items = Item.all
  end

  def new
    @item = Item.new
  end

  def create
    @item = Item.create(item_params)
    @item.user = current_user
    if @item.save
      flash[:success] = "Your item was successfully listed."
      render 'show'
    else
      flash[:error] = "Your item could not be listed. Please try again."
      render 'new'
    end
  end

  def show
    @item = Item.find(params[:id])
  end

  def edit
  end

  def update
    if @item.update(item_params)
      flash[:success] = "Your item listing was updated successfully."
      redirect_to item_path(@item)
    else
      flash[:error] = "Your listing was not updated. Please try again."
      render 'edit'
    end
  end

  def sold
    @item.toggle(:sold)
    @item.save
    redirect_to item_path(@item)
  end

  private
  def item_params
    params.require(:item).permit(:title, :price, :description)
  end

  def findItem
    @item = Item.find(params[:id])
  end
end

<div class="row">
  <div class="col-xs-12">
    <%= form_for(@item, :html => {class: "form-horizontal", role: "form"}) do |f| %>
      <div class="form-group">
    <div class="control-label col-sm-2">
      <%= f.label :title %>
    </div>
    <div class="col-sm-8">
      <%= f.text_field :title, class: "form-control", placeholder: "What are you selling?", autofocus: true %>
    </div>
  </div>

  <div class="form-group">
    <div class="control-label col-sm-2">
      <%= f.label :price %>
    </div>
    <div class="col-sm-8">
      <%= f.number_field :price, class: "form-control" %>
    </div>
  </div>

  <div class="form-group">
    <div class="control-label col-sm-2">
      <%= f.label :description %>
    </div>
    <div class="col-sm-8">
      <%= f.text_area :description, rows: 10, class: "form-control", placeholder: "Describe your item. The more detail you include, the more likely it is to sell." %>
    </div>
  </div>

  <div class="form-group">
    <div class="center col-sm-offset-1 col-sm-10">
      <%= f.submit class: "btn btn-primary btn-lg" %>
    </div>
  </div>
<% end %>

<div class="center col-xs-4 col-xs-offset-4">
  <%= link_to "[ Cancel and return to listing page ]", items_path %>
</div>

#app/models/item.rb
class Item < ActiveRecord::Base
   has_many :images
   accepts_nested_attributes_for :images
   validates :title, :price, :description, presence: true
end

#app/models/image.rb
class Image < ActiveRecord::Base
   belongs_to :item
   has_attached_file :picture
end

#app/controllers/items_controller.rb
class ItemsController < ApplicationController
   def new
      @item = Item.new
      @item.images.build
   end

   def create
      @item = Item.new item_params
      @item.save
   end

   private

   def item_params
      params.require(:item).permit(images_attributes: [:picture])
   end
end

#app/views/items/new.html.erb
<%= form_for @item do |f| %>
   <%= f.fields_for :images do |i| %>
      <%= i.file_field :picture %>
   <% end %>
   <%= f.submit %>
<% end %>