#<ActionDispatch::Http::UploadedFile:0x007fae8c0bfaa8>的未定义方法`[]' [英] undefined method `[]' for #<ActionDispatch::Http::UploadedFile:0x007fae8c0bfaa8>

问题描述

我在 file_field 列中嵌套了表单，当我尝试创建它时会抛出UserController 中的 NoMethodError#update#

I have nested form with the file_field column, when i try to create it throws NoMethodError in UserController#update undefined method `[]' for #

{
 "utf8"=>"✓",
 "authenticity_token"=>"HFWawKp4RH7+AFV0yQ1cXpzxHDfubKTKkiDiS6QKnJk=",
 "user"=> { 
  "name"=>"Test",
  "image_attributes"=> { 
    "picture"=>#<ActionDispatch::Http::UploadedFile:0x3f4e318
    @original_filename="Beautiful Sky_thumb.jpg",
    @content_type="image/jpeg",
    @headers="Content-Disposition: form-data; name=\"user[pics_attributes][pic]\"; filename=\"Beautiful Sky_thumb.jpg\"\r\nContent-Type: image/jpeg\r\n",
    @tempfile=#<File:C:/Users/Alex/AppData/Local/Temp/RackMultipart20120824-4784-5rmxid>>
  }
 },
"commit"=>"Save User"
}

我的模特

class User < ActiveRecord::Base
  attr_accessbile: :name, image_attributes
  has_many :images
  accepts_nested_attributes_for: images
end

class Image < ActiveRecord::Base
  belongs_to :verve_app
  mount_uploader picture, PictureUploader
end

我的控制器

def new
  @user = User.new
  @user.images.build
end

def create
  @user = User.new(params[:user])
  @user.save!
end

我的观点

<%= form_for @user do |f| %>
  <%= f.hidden_field :name, {value: 'Alex'} %>
  <%= f.fields_for :image_attributes do |image| %>
    <%= image.file_field :picture %>
  <% end %>
  <%= user.submit %>
<% end %>

推荐答案

尝试在模型类 :image 而不是 :image_attributes 上调用 fields_for.

Try calling fields_for on the model class :image rather than on :image_attributes.

替换你的 <%= f.fields_for :image_attributes do |image|%> with <%= f.fields_for :image do |i|%>.然后将 image.file_field 改为 i.file_field

Replace your <%= f.fields_for :image_attributes do |image| %> with <%= f.fields_for :image do |i| %>. Then change image.file_field to i.file_field

看看这是否有帮助，或者至少会产生新的错误供我们处理.

See if this helps, or at least produces new error for us to work from.

这篇关于#&lt;ActionDispatch::Http::UploadedFile:0x007fae8c0bfaa8&gt;的未定义方法`[]'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！