Carrierwave: Не сохраняются файлы в uploads

require 'carrierwave'
class User < ActiveRecord::Base
  mount_uploader :avatar, AvatarUploader
end

class AvatarUploader < CarrierWave::Uploader::Base
  storage :file
end

post '/create' do
 
    user = User.find_or_create_by(name: params[:name]) do |user|
      user.name  = params[:name]
      user.email = params[:email]
      user.password = params[:password]
      user.password_confirmation = params[:password_confirmation]
      p '--------------------------------------------------------------'
      p  params[:avatar]
      user.avatar = params[:avatar]
      p '--------------------------------------------------------------'
      p  user.avatar
 
    end

class ImageUploader < CarrierWave::Uploader::Base
  storage :file
end

require_relative 'image_uploader'
 
class Bookmark < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

require 'sinatra'
require 'sinatra/activerecord'
require 'carrierwave'
require 'carrierwave/orm/activerecord'
 
set :database, {adapter: 'sqlite3', database: 'development.sqlite3'}
 
require_relative 'bookmark'
 
class Hash
  def slice(*whitelist)
    whitelist.inject({}) { |result, key| result.merge(key => self[key]) }
  end
end
 
get '/bookmarks' do
  content_type :json
  Bookmark.all.to_json
end
 
post '/bookmarks' do
  input = params.slice 'url', 'title', 'image'
  bookmark = Bookmark.create input
  [201, "/bookmarks/#{bookmark['id']}"]
end
 
get '/bookmark/:id' do
  bookmark = Bookmark.find(params[:id])
  content_type :json
  bookmark.to_json
end
 
get '/' do
  erb :index
end

require 'rspec'
require 'rack/test'
require_relative 'app'
 
RSpec.describe 'Bookmarks application' do
  include Rack::Test::Methods
  def app
    Sinatra::Application
  end
 
  it 'creates new bookmark' do
    get '/bookmarks'
    bookmarks = JSON.parse(last_response.body)
    last_size = bookmarks.size
 
    image = Rack::Test::UploadedFile.new(File.open('/home/j2funonly/Pictures/sinatra_logo.png'))
    post '/bookmarks', {url: 'http://www,test.com', title: 'test', image: image}
 
    expect(last_response.status).to eq 201
    expect(last_response.body).to match(/\/bookmarks\/\d+/)
 
    get '/bookmarks'
    bookmarks = JSON.parse(last_response.body)
    expect(bookmarks.size).to eq(last_size + 1)
 
    bookmark = Bookmark.first
    expect(bookmark.image?).to be_truthy
    expect(bookmark.image.url).to eq '/uploads/sinatra_logo.png'
 
    get '/uploads/sinatra_logo.png'
    expect(last_response.status).to eq 200
 
    get '/uploads/no_such_file.png'
    expect(last_response.status).to eq 404
  end
end