载波图像上传不起作用

我正在尝试使用通过轨道的carrierwave应用程序将徽标图像上传到Amazon s3存储桶。 但是我的文件上传没有将文件读取为HTTP文件并将NULL添加到数据库中。我无法弄清楚我的代码出了什么问题。

这是我的模型

class StoreLocation < ActiveRecord::Base
  mount_uploader :logo_url, ImageUploader
  ...
end

我的图片上传器

require 'carrierwave/orm/activerecord'
class ImageUploader < CarrierWave::Uploader::Base
 # Include RMagick or MiniMagick support:
 # include CarrierWave::RMagick
 # include CarrierWave::MiniMagick
  # Choose what kind of storage to use for this uploader:
  #storage :file
  storage :fog
  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end
  def cache_dir
    # "#{Rails.root}/tmp/uploads"
    Rails.root.join 'tmp/uploads'
  end
  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  def extension_white_list
    %w(jpg jpeg gif png)
  end
end

我的store_location/new.html.erb 中的片段

<div>
          <input id="picholder" type="file" name = "store_location[logo_url]" style = "width: 0px;">
          <img id="storeLogo" src="/assets/Picupload_bg.png" alt="storeLogo" class = "small_thumb"/>
          <img src="/assets/brws.png" id="brws_logo_file" class = "brws_btn">
        </div>

我的JavaScript store_location.js读取文件。

$(document).on('ready page:load', function () {
  jQuery.validator.addMethod("lettersonly", function(value, element) {
        return this.optional(element) || /^[A-Za-z ]+$/i.test(value);
    }, " ");
function readURLImage(filePath) {
  if (filePath.files && filePath.files[0]) {
    var reader = new FileReader();        
    reader.onload = function (e) {
        $('#storeLogo').attr('src', e.target.result);
    }
    reader.readAsDataURL(filePath.files[0]);
  }
}
$("#picholder").change(function(){
    readURLImage(this);
  });
$("#brws_logo_file").click(function () {
    $("#picholder").trigger('click');
  });

}）;

当我运行它时，我可以在选择任何图像文件时在表单上看到缩略图，但请求中的参数如下：（来自 rails 日志）

Parameters: {"utf8"=>"✓", "authenticity_token"=>"Q0ejEHG2uzPlSlJ2XF8eC7uVXWs76jtEGfXRNCHgyuc=", "store_location"=>{"store_name"=>"Origins", "first_address"=>"Gulberg", "second_address"=>"", "country"=>"Pakistan", "state"=>"Punjab", "city"=>"Lahore", "zip_code"=>"54000", "phone_no"=>"111674446", "logo_url"=>"b3.jpg"}, "commit"=>"Submit"}
INSERT INTO `store_locations` (`city`, `country`, `created_at`, `first_address`, `logo_url`, `phone_no`, `second_address`, `state`, `store_name`, `updated_at`, `user_id`, `zip_code`) VALUES ('Lahore', 'Pakistan', '2014-12-10 10:33:37', 'Gulberg', NULL, '111674446', '', 'Punjab', 'Origins', '2014-12-10 10:33:37', 1, '54000')

我不明白为什么logo_url只是文件名，它应该是这样的

 "logo_url"=>#<ActionDispatch::Http::UploadedFile:0x00000009b07c88 @tempfile=#<Tempfile:/tmp/RackMultipart20141209-15502-1q6mzyf>, @original_filename="b3.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name='"store_location[logo_url]'"; filename='"b3.jpg'"'r'nContent-Type: image/jpeg'r'n">

在这方面的任何帮助将不胜感激。谢谢。