我无法通过多文件上传找出我在做错的事情。我有另一个rails4应用程序与类似的设置，只有postgresql而不是mongoid，我没有遇到这个问题。我不确定它是否与carrierwave-mongoid有什么关系。我如何进一步缩小实际导致TypeError ???的原因
更新重新创建了整个应用并使用了Postgresql，并遇到了同样的问题..所以它不像我想的那样被隔离到了carrierwave-mongoid。
Development.log
Started POST "/images" for 127.0.0.1 at 2014-10-02 11:28:28 -0400
Processing by ImagesController#create as JSON
Parameters: {"utf8"=>"✓", "authenticity_token"=>"MPtXrjrQ+dLb67LVD+aYUrMIYfCUBQWLOaOztlB2sSU=", "image"=>{"gallery_id"=>"3", "file"=>[#<ActionDispatch::Http::UploadedFile:0x007fb55e80c378 @tempfile=#<Tempfile:/var/folders/3m/t1v11gzj32n0fdbhwr823y600000gn/T/RackMultipart20141002-33694-3bmoib>, @original_filename="10495567_1510476362523625_7774203923998269219_o.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"image[file][]\"; filename=\"10495567_1510476362523625_7774203923998269219_o.jpg\"\r\nContent-Type: image/jpeg\r\n">]}}
Completed 500 Internal Server Error in 3ms
TypeError (no implicit conversion of nil into String):
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carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `cache_path'
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carrierwave (0.10.0) lib/carrierwave/uploader/callbacks.rb:17:in `with_callbacks'
carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:122:in `cache!'
carrierwave (0.10.0) lib/carrierwave/mount.rb:329:in `cache'
carrierwave (0.10.0) lib/carrierwave/mount.rb:163:in `file='
carrierwave (0.10.0) lib/carrierwave/orm/activerecord.rb:39:in `file='
activerecord (4.1.5) lib/active_record/attribute_assignment.rb:45:in `public_send'
activerecord (4.1.5) lib/active_record/attribute_assignment.rb:45:in `_assign_attribute'
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activerecord (4.1.5) lib/active_record/inheritance.rb:30:in `new'
cancancan (1.9.2) lib/cancan/controller_resource.rb:85:in `build_resource'
cancancan (1.9.2) lib/cancan/controller_resource.rb:66:in `load_resource_instance'
cancancan (1.9.2) lib/cancan/controller_resource.rb:32:in `load_resource'
cancancan (1.9.2) lib/cancan/controller_resource.rb:25:in `load_and_authorize_resource'
cancancan (1.9.2) lib/cancan/controller_resource.rb:10:in `block in add_before_filter'
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模型
class Picture
include Mongoid::Document
include Mongoid::Timestamps
belongs_to :gallery
mount_uploader :file, PictureUploader
def to_jq_upload
{
"name" => read_attribute(:file),
"size" => file.size,
"url" => file.url,
"thumb_url" => file.thumb.url,
#"delete_url" => gallery_picture_path(:id => id),
"delete_type" => "DELETE"
}
end
end
控制器
class PicturesController < ApplicationController
load_and_authorize_resource
before_action :set_picture, only: [:destroy]
def create
p_attr = params[:picture]
p_attr[:file] = params[:picture][:file].first if params[:picture][:file].class == Array
logger.debug "params = #{params}"
logger.debug "p_attr = #{p_attr}"
@picture = Picture.new(p_attr)
if @picture.save
respond_to do |format|
format.js
format.html {
render :json => [@picture.to_jq_upload].to_json,
:content_type => 'text/html',
:layout => false
}
format.json {
render :json => { :files => [@picture.to_jq_upload] }
}
end
else
render :json => [{:error => "custom_failure"}], :status => 304
end
end
private
def picture_params
params.require(:picture).permit(:gallery_id, file:[])
end
表格
<%= form_for Picture.new, :html => { :multipart => true, :id => "fileupload" } do |fm| %>
<%= fm.file_field :file, :id => "add_images_field", :multiple => true %>
<% end %>
的Gemfile
gem 'rails', '4.1.5'
gem 'mongoid', '~> 4.0.0'
gem 'bson_ext'
gem 'carrierwave-mongoid', :require => 'carrierwave/mongoid'
gem 'mini_magick'
gem 'fog'
gem "jquery-fileupload-rails"
答案 0 :(得分：2)
快速查看我会说你错误地设置了picture_params;至少基于POST提交字符串。 “file”嵌套在“image”下，它不在哈希的根级别中。
Rails 4 - Strong Parameters - Nested Objects
这是POST字符串的一些可视化格式：
{
"utf8"=>"✓"
"authenticity_token"=>"MPtXrjrQ+dLb67LVD+aYUrMIYfCUBQWLOaOztlB2sSU="
"image"=>{
"gallery_id"=>"3"
"file"=>[#<ActionDispatch::Http::UploadedFile:0x007fb55e80c378 @tempfile=#<Tempfile:/var/folders/3m/t1v11gzj32n0fdbhwr823y600000gn/T/RackMultipart20141002-33694-3bmoib>
@original_filename="10495567_1510476362523625_7774203923998269219_o.jpg"
@content_type="image/jpeg"
@headers="Content-Disposition: form-data; name=\"image[file][]\"; filename=\"10495567_1510476362523625_7774203923998269219_o.jpg\"\r\nContent-Type: image/jpeg\r\n">]
}
}
所以你需要的是：
params.require(:picture).permit(:image => [:gallery_id, file: []])
但是，由于您的表单提交哈希值与模型名称不匹配 - 无论出于何种原因，请尝试：
params.require(:image).permit(:gallery_id, file: [])
编辑：我也很好奇你为什么要在file内嵌套gallery_id和image属性。这将改变rails将参数分配给模型的方式，也许就是为什么你会得到零。我认为真正的问题是你设置表单的方式。看一下你的routes.rb文件;该网址以/images结尾，但您的模型为Picture。看起来你有一个命名冲突 - 可能在你的代码的多个方面。
答案 1 :(得分：1)
@JakeTheSnake可能会出现问题。在更具体的层面上，我根据你的回溯自己快速查看了一下。
请参阅源代码here on GitHub，第159行，这是您的回溯引用的前两行的行：
carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `join'
carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `cache_path'
盐的粒子，在这里，因为我对Carrierwave一无所知，而且很少有信息可以消除。但是，我搜索了0.10.0载波文件的方法“cache_path”，但没有发现任何内容。请注意，您的回溯的第一行引用“join”，如File.join中所示。我的猜测是，File.join，cache_name，cache_path或最终root中的三个调用之一正在返回nil。 File.join正在尝试将此nil转换为String，这在Ruby中不会发生。
我知道这个答案并不像它可能那样具有技术性，并且它没有接近直接解决问题。我只希望它能够至少指出你正确的方向或以某种方式提供帮助。
如果我能得到更多帮助，请告诉我。祝你好运。
编辑：它可能在任何地方，我通过查看回溯中引用的更多代码来收集，让我相信@JakeTheSnake确实在那里。我相信他可能是正确的，当他说它是高级别的东西（如错误配置的形式或控制器，小东西），然而，深入分析你的回溯和他们背后的代码超级，超级有用，可以产生许多件这个谜题。如果你还没有，我会很好地看看回溯中引用的代码。祝你好运，如果我能提供更多帮助，请告诉我。
答案 2 :(得分：0)
这是我的解决方案：
的型号：
class Picture < ActiveRecord::Base
include Rails.application.routes.url_helpers
mount_uploader :image, SimpleImageUploader
def to_jq_upload
{
"name" => read_attribute(:image),
"size" => image.size,
"url" => image.url,
"thumbnail_url" => image.thumb.url,
"delete_url" => picture_path(:id => id),
"delete_type" => "DELETE"
}
end
end
<强>动作：
def create
pics = picture_params
@picture = Picture.new(image: pics[:image].first)
if @picture.save
...
end
end
...
private
def picture_params
params.require(:picture).permit(image: [])
end
很快查看：
<%= form_for Picture.new, :html => {:multipart => true, :id => "fileupload"} do |f| %>
<%= f.file_field :image, multiple: true, accept: 'image/*' %>
..
<% end %>