Carrierwave, DataMapper, & Sinatra starring in "Imagine the Possibilities"

helpers.rb

def is_ajax_request?
  if respond_to? :content_type
    if request.xhr?
      true
    else
      false
    end
  else
    false
  end
end

def json_data(data)
  content_type "application/json" if is_ajax_request?
  {:data => data}.to_json
end

def json_errors(*objs)
  content_type "application/json" if is_ajax_request?
  
  errors = {}
  objs.each do |o|
    if o.respond_to? :errors
      errors[o.class.name.snake_case] = o.errors.to_hash
    else
      unless errors['general']
        errors['general'] = []
      end
      errors['general'].push(*o)
    end
  end
  {:errors => errors}.to_json
end

def json_redirect(url)
  content_type "application/json" if is_ajax_request?
  {:redirect => url}.to_json
end

init.rb

require 'sinatra'
require 'helpers'
require 'models'

post '/settings_image' do
  require_login
  @user = session_user
  @user.image = params['user']['image']
  if @user.save
    @user.reload
    json_data({
      :image => @user.image.url,
      :image_icon40 => @user.image.icon40.url,
      :image_icon60 => @user.image.icon60.url
    })
  else
    json_errors("Failed",@user)
  end
end

models.rb

class UserImageUploader < CarrierWave::Uploader::Base 
  include CarrierWave::MiniMagick 
 
  if settings.environment == :production 
    storage :s3 
  else 
    storage :file 
  end 
 
  def store_dir 
    "uploads/users/#{model.id}/image" 
  end 
 
  def extensions_white_list 
    %w(jpg jpeg gif png) 
  end 
 
  process :resize_to_limit => [720,720] 
  version :icon40 do 
    process :resize_to_fill => [40,40] 
  end 
  version :icon60 do 
    process :resize_to_fill => [60,60] 
  end 
  version :profile do 
    process :resize_to_limit => [180,180] 
  end 
end 

class User
  include DataMapper::Resource

  property :id, Serial
  timestamps :at, :on
  property :username, String

  property :image, String, :auto_validation => false
  mount_uploader :image, UserImageUploader
end

I would like to see the upload form also. What do you send to the mount_uploader :image property?? Sinatra uses params[:name] and either [:filename] or [:tmpfile]