Rails 4：如何使用carrierwave上传多个图像
我可以使用carrierwave上传文件，如下面的代码所示。 如何编辑代码，以便在一篇文章中上传最多3个文件的图像？
意见\文章\ new.html.erb
. . . . views \ shared \ _article_form.html.erb
. . . .
\型号\ article.rb
class Article < ActiveRecord::Base belongs_to :user belongs_to :category has_many :photos, dependent: :destroy accepts_nested_attributes_for :photos . . end
\型号\ photo.rb
class Photo < ActiveRecord::Base belongs_to :article mount_uploader :image, ImageUploader validates :image, presence: true end
\控制器\ articles_controller.rb
class ArticlesController < ApplicationController . . def new @article = Article.new @category = Category.find(params[:category]) @article.category_id = @category.id @article.photos.build end def create @article = current_user.articles.build(article_params) if @article.save flash[:success] = "article created!" redirect_to current_user #root_url else @feed_items = [] render 'new' end end def edit @article = Article.find(params[:id]) end def update @article = Article.find(params[:id]) if @article.update(article_params) redirect_to current_user else render 'edit' end end . . private def article_params params.require(:article).permit(:content, :category_id, photos_attributes: [:id, :article_id, :image]) end . . end
将您的新操作更改为：
def new @article = Article.new @category = Category.find(params[:category]) @article.category_id = @category.id @photo = @article.photos.build end
在您的file_field中，您需要使用multiple option因此您的表单将如下所示：
<%= form_for(@article,:html => { :multipart => true }) do |f| %> // article fields <%= f.fields_for @photo do |p| %> <%= p.file_field :image, multiple: true %> <% end %> <% end %>
更新
更改您的新动作并制作3张照片
def new @article = Article.new @category = Category.find(params[:category]) @article.category_id = @category.id 3.times { @article.photos.build } end
和你的表格
<%= form_for(@article,:html => { :multipart => true }) do |f| %> // article fields <%= f.fields_for :photos do |p| %> <%= p.file_field :image %> <% end %> <% end %>
此外，您还必须稍微修改模型才能拒绝空白值
class Article < ActiveRecord::Base belongs_to :user belongs_to :category has_many :photos, dependent: :destroy accepts_nested_attributes_for :photos, reject_if: proc { |attributes| attributes[:image].blank? } . . end
您只需要在form添加:html => { :multipart => true }即可上传多个文件。
<%= form_for(@article,:html => { :multipart => true }) do |f| %>
此外，您还必须将此行<%= p.file_field :image %>更改为<%= p.file_field :image, :multiple => true %>