Carrierwave && dropzone-rails doesn't load in the uploads folder. Only in tmp. What is the problem?

Question

Ruby on Rails

image/index

<%= form_tag '/images', method: :post, class: "dropzone", id: "media-dropzone", :authenticity_token => true do %>
    <div class="fallback">
      <%= file_field_tag 'image', multiple: true %>
    </div>
<% end %>

ImagesController

def create
    @image = Image.new(image: params[:image])
    if @image.save!
      respond_to do |format|
        format.json{ render :json => @image }
      end
    end
  end

ImageUploader

# encoding: utf-8

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
  # process :resize_to_limit => [1000, 1000]
  # 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

  # Provide a default URL as a default if there hasn't been a file uploaded:
  # def default_url
  #   # For Rails 3.1+ asset pipeline compatibility:
  #   # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
  #
  #   "/images/fallback/" + [version_name, "default.png"].compact.join('_')
  # end

  # Process files as they are uploaded:
  # process :scale => [200, 300]
  #
  # def scale(width, height)
  #   # do something
  # end

  # Create different versions of your uploaded files:
  version :thumb do
    process :resize_to_fit => [50, 50]
  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

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here, see uploader/store.rb for details.
  # def filename
  #   "something.jpg" if original_filename
  # end

end

image model

class Image < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

Answer 1

On the surface, there may be several reasons.
First replace
@image.save! to just save, and print errors if it doesn't save like this:

def create
    @image = Image.new(image: params[:image])
    if @image.save
        respond_to do |format|
            format.json{ render :json => @image }
        end
    else 
        render json: @image.errors
    end
end

Secondly, look at what you have in params[:image], if it is empty then google in the direction of "strong params"
But most likely you have an array there, and you are trying to put an array into a string. You need to iterate over the entire params[:image] array and create an Image for each element

Answer 2

Why create a form through form_tag instead of form_for ?
File transfer requires multipartd/form-data. In your form, the line most likely comes instead of Rack:: Attachment or something similar