Paperclip Upload "No file chosen" (fixed)

_form.html.haml

= semantic_form_for [@space, @map], :html => {:multipart => true} do |f|
  = f.inputs do
    = f.input :space_id, :as => :hidden
    = f.input :image
  = f.actions

development.rb

Connie::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  ...

  # Expands the lines which load the assets
  config.assets.debug = false #true

  # Paperclip configuration
  Paperclip.options[:command_path] = "/usr/bin/"
end

Log

Started POST "/spaces/1/maps" for 127.0.0.1 at 2012-08-09 19:59:07 -0400
Processing by MapsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"LWOp0AQARd2EzN+ls+DocIXcuexaRQQt8tCMjh+M1QY=", "map"=>{"space_id"=>"1", "imag
e"=>#<ActionDispatch::Http::UploadedFile:0x000000031c87e0 @original_filename="cartoon.jpg", @content_type="image/jpeg", @headers
="Content-Disposition: form-data; name=\"map[image]\"; filename=\"cartoon.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<Fi
le:/tmp/RackMultipart20120809-11699-175s08t>>}, "commit"=>"Create Map", "space_id"=>"1"}

map.rb

class Map < ActiveRecord::Base
  attr_accessible :space_id, :image

  belongs_to :space

  has_attached_file :image,
                    :styles => {:medium => "300x300>",
                                :thumb => "100x100>"}
  validates_attachment_presence :image
end

maps_controller.rb

class MapsController < ApplicationController
  def new
    @space = Space.find(params[:space_id])
    @map = @space.maps.build
  end

  def create
    @space = Space.find(params[:space_id])
    @map = @space.maps.build(params[:map])  # << This was wrongly :space previously

    if @map.save
      redirect_to [@space, @map], :notice => "Map created successfully"
    else
      render :action => :new
    end
  end

 ...

schema.rb

...

  create_table "maps", :force => true do |t|
    t.integer  "space_id"
    t.datetime "created_at",         :null => false
    t.datetime "updated_at",         :null => false
    t.string   "image_file_name"
    t.string   "image_content_type"
    t.integer  "image_file_size"
    t.datetime "image_updated_at"
  end

...