activerecord - Rails 3 polymorphic association with Carrierwave and Simple Form -

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i'm trying set polymorphic association photo uploads processed using carrierwave. i'm using simple form build forms. feel association correct i'm wondering if problem form or controller.

here associations:

property.rb:

class property < activerecord::base   attr_accessible :image   ...   has_many :image, :as => :attachable   ... end

unit.rb

class unit < activerecord::base   attr_accessible :image   ...   has_many :image, :as => :attachable end

image.rb

class image < activerecord::base   belongs_to :attachable, :polymorphic => true   mount_uploader :image, photouploader end

properties_controller.rb:

def edit     @property = property.find params[:id]     @property.image.build if @property.image.empty? end  def update     @property = property.find params[:id]     if @property.update_attributes params[:property]         redirect_to admin_properties_path, :notice => 'the property has been updated.'     else         render "edit"     end end

snippet properties/_form.html.erb

<%= f.input :image, :label => 'image:', :as => :file %>

here error when submitting image attached:

undefined method `each' #<actiondispatch::http::uploadedfile:0x00000102291bb8>

and here params:

{"utf8"=>"✓",  "_method"=>"put",  "authenticity_token"=>"lvb7emdc7juip3gbzd3xhclyiv1vwq/hifdb6f1mtia=",  "property"=>{"name"=>"delaware woods",  "address"=>"",  "city"=>"",  "state"=>"",  "postal_code"=>"",  "description"=>"2 bedroom large kitchen.  garage available",  "incentives"=>"",  "active"=>"1",  "feature_ids"=>[""],  "user_ids"=>[""],  "image"=>#<actiondispatch::http::uploadedfile:0x00000102291bb8 @original_filename="wallpaper-4331.jpg",  @content_type="image/jpeg",  @headers="content-disposition: form-data; name=\"property[image]\"; filename=\"wallpaper-4331.jpg\"\r\ncontent-type: image/jpeg\r\n",  @tempfile=#<file:/tmp/rackmultipart20120608-3102-13f3pyv>>},  "commit"=>"update property",  "id"=>"18"}

i'm looking everywhere on polymorphic associations , getting nowhere. i've seen simple examples pretty straight forward. 1 thing i've noticed seems in lot of examples has_many association in case should images , not image. when error:

can't mass-assign protected attributes: image

i've tried updating form use fields_for i've seen in other blogs so:

<%= f.input :image, :label => "photo", :as => :file %>  <% f.simple_fields_for :images |images_form| %>         <%= images_form.input :id, :as => :hidden %>         <%= images_form.input :attachable_id, :as => :hidden %>         <%= images_form.input :attachable_type, :as => :hidden %>         <%= images_form.input :image, :as => :file %> <% end %>

all know i'm having heck of time getting work. i'm pretty new rails debugging difficult. doesn't debugger doesn't work in 3.2 :(

since models have_many :images (it should :images, not :image), you'll want use nested_forms in views. should set accepts_nested_attributes_for :images on unit , property models , change attr_accessible :image :image_attributes.

check out http://railscasts.com/episodes/196-nested-model-form-part-1 guide on getting going it.


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