500错误编辑和更新多个文件上传rails(500 error editing and updating multiple file uploads rails)

我正在使用Paperclip，我已经为我的一个模型添加了多个文件上传。一切正常，除非我尝试将新文件添加到已上传的现有文件中。它抛出此错误：

Unexpected error while processing request: expected Hash (got Array) for param `assets_attributes'

我该如何解决这个问题，以便我可以添加新文件？提前致谢。

asset.rb

class Asset < ActiveRecord::Base belongs_to :member belongs_to :listing attr_accessible :asset has_attached_file :asset, styles: { large: "700x700>", thumb: "100x100#" } validates_attachment_size :asset, :less_than_or_equal_to=>10.megabyte validates_attachment_content_type :asset, :content_type=>['image/jpeg', 'image/jpg', 'image/png', 'image/gif'] end

listing.rb

has_many :assets, :dependent => :destroy accepts_nested_attributes_for :assets, :allow_destroy => true attr_accessible :assets_attributes

列表/ _edit_form.html.erb

<%= simple_form_for(@listing, :html => { class: 'form-horizontal ', :multipart => true }) do |f| %> <% if @listing.errors.any? %> <%= f.error_notification %> <div> <%= file_field_tag('listing_assets_asset', multiple: true, name: "listing[assets_attributes][][asset]", id: 'file-upload3', class: '') %> </div> <% end %>

listings_controller.rb

before_filter :authenticate_member!, only: [:new, :create, :edit, :update, :destroy] before_filter :find_member before_filter :find_listing, only: [:edit, :update, :destroy] def new @listing = Listing.new respond_to do |format| format.html # new.html.erb format.json { render json: @listing } end end # GET /listings/1/edit def edit end # POST /listings # POST /listings.json def create @listing = current_member.listings.new(params[:listing]) respond_to do |format| if @listing.save current_member.create_activity(@listing, 'created') format.html { redirect_to @listing } format.json { render json: @listing, status: :created, location: @listing } else format.html { render action: "new" } format.json { render json: @listing.errors, status: :unprocessable_entity } end end end # PUT /listings/1 # PUT /listings/1.json def update respond_to do |format| if @listing.update_attributes(params[:listing]) format.html { redirect_to @listing } format.json { head :no_content } else format.html { render action: "edit" } format.json { render json: @listing.errors, status: :unprocessable_entity } end end end private def find_member @member = Member.find_by_user_name(params[:user_name]) end def find_listing @listing = current_member.listings.find(params[:id]) end

I'm using Paperclip and I've added multiple file uploads to one of my models. Everything works fine except when I try to add new files to the existing ones already uploaded. It throws this error:

Unexpected error while processing request: expected Hash (got Array) for param `assets_attributes'

How can I fix this so that I can add new files? Thanks in advance.

asset.rb

class Asset < ActiveRecord::Base belongs_to :member belongs_to :listing attr_accessible :asset has_attached_file :asset, styles: { large: "700x700>", thumb: "100x100#" } validates_attachment_size :asset, :less_than_or_equal_to=>10.megabyte validates_attachment_content_type :asset, :content_type=>['image/jpeg', 'image/jpg', 'image/png', 'image/gif'] end

listing.rb

has_many :assets, :dependent => :destroy accepts_nested_attributes_for :assets, :allow_destroy => true attr_accessible :assets_attributes

listings/_edit_form.html.erb

<%= simple_form_for(@listing, :html => { class: 'form-horizontal ', :multipart => true }) do |f| %> <% if @listing.errors.any? %> <%= f.error_notification %> <div> <%= file_field_tag('listing_assets_asset', multiple: true, name: "listing[assets_attributes][][asset]", id: 'file-upload3', class: '') %> </div> <% end %>

listings_controller.rb

before_filter :authenticate_member!, only: [:new, :create, :edit, :update, :destroy] before_filter :find_member before_filter :find_listing, only: [:edit, :update, :destroy] def new @listing = Listing.new respond_to do |format| format.html # new.html.erb format.json { render json: @listing } end end # GET /listings/1/edit def edit end # POST /listings # POST /listings.json def create @listing = current_member.listings.new(params[:listing]) respond_to do |format| if @listing.save current_member.create_activity(@listing, 'created') format.html { redirect_to @listing } format.json { render json: @listing, status: :created, location: @listing } else format.html { render action: "new" } format.json { render json: @listing.errors, status: :unprocessable_entity } end end end # PUT /listings/1 # PUT /listings/1.json def update respond_to do |format| if @listing.update_attributes(params[:listing]) format.html { redirect_to @listing } format.json { head :no_content } else format.html { render action: "edit" } format.json { render json: @listing.errors, status: :unprocessable_entity } end end end private def find_member @member = Member.find_by_user_name(params[:user_name]) end def find_listing @listing = current_member.listings.find(params[:id]) end

最满意答案

accepts_nested_attributes_for期望它处理的*_attributes值的哈希值，它所期望的哈希值将数组索引作为键，即。它期望这样的事情：

asset_attributes: { 0 => { asset: value_for_0 }, 1 => { asset: value_for_1 } }

通过创建表单字段的名称listing[assets_attributes][][asset]您实际上是在创建一个数组，即。

asset_attributes: [ { asset: value_for_0 }, { asset: value_for_1 } ]

这就是您收到错误的原因。

我认为你的名字是什么意思： listing[assets_attributes][asset][]这将创建：

asset_attributes: { 0 => { asset: [ array, of, IO, objects, for, your, files ] } }

That fixed the error issue but did not fix my overall problem. I found the fix to my problem by looking at this article: http://www.railscook.com/recipes/multiple-files-upload-with-nested-resource-using-paperclip-in-rails/

I needed to change the way I was handling multiple uploads.

Changing my input to this:

<%= file_field_tag "assets[]", type: :file, multiple: true, id: 'file-upload3' %>

and adding the following to my create and update actions in my controler:

if params[:assets] params[:assets].each { |asset| @listing.assets.create(asset: asset) } end

Doing these things resolved my issue.

更多推荐