saving multiple images using accept_nested_attributes using paperclip in rails 3

Question

i have two models

########## image.rb

has_many :image_assets , :dependent => :destroy 
accepts_nested_attributes_for :image_assets, :reject_if => lambda { |a| a[:avatar].blank? }, :allow_destroy => true

########## image_assets.rb  

belongs_to :image  
has_attached_file :avatar,
 :styles => {:view => "187x260#"},
:storage => :s3,
:s3_permissions => :private,
:s3_credentials => S3_CREDENTIALS

 attr_accessible :image_id,:avatar,:avatar_file_name,:avatar_content_type,:avatar_file_size,:avatar_updated_at


##########   in my controller
def new
    @image = Image.new
    #3.times {@image.image_assets.build} # added this
    @image.image_assets.build
    respond_to :js
end

def create
   @image = Image.new(params[:image])  
   @image.user_id = current_or_guest_user.id
  ##########this works but no use as parent is not getting save..ie @image
  # if params[:image_assets][:avatar]
  #     params[:image_assets][:avatar].each do |avatar|
  #       @image.image_assets.build(:avatar=> avatar)
  #     end 
  # end
  ########here i am unable to save the @image 
   if @image.save
       if params[:image_assets][:avatar]
        params[:image_assets][:avatar].each { |image|
          @image.image_assets.create(avatar: image)
        }
      end
     redirect_to @image
  else
     flash[:alert] = "Something went wrong."
      render :new
  end 

end

i am working on saving multiple image uploads using @image.image_assets.build instead of #3.times {@image.image_assets.build} as i dont wont my users to see three upload button,Hence i am using multiple=>true so that i can get an array of uploads and then save it using the association image.image_assets.build but unable to save the parent ie @image..i even tried inverse_of ,but i dont think i need it...when i place the loop to save the nested association,i can see the insert queries but upon saving the parent ie @image..it rollbacks...still wondering whats wrong..

 ########## my _form.html.erb
<%= form_for(@image,:html=>{:multipart => true,:remote=>true,:class=>"form-horizontal",:role=>"form"}) do |f |%> 
  <div class="form-group">   
     <%= f.fields_for :image_assets do |builder| %>   
      <% if builder.object.new_record? %>   
        Upload picture
        <%= builder.file_field :avatar,:multiple=>"true",:name=>"image_assets[avatar] []",:class=>"opacity"%>
    <% end %>  
<% end %>
<% end %>     

 ##########this is the error stack i have


Started POST "/images" for 127.0.0.1 at 2014-08-17 02:03:17 -0700
Processing by ImagesController#create as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"MbZz1iMRVhGgl+WniARp8+FZaaDFtyYtodxxzGzo57w=", "image"=>{"title"=>"hiii", "about"=>"ddddddd", "tag_list"=>"2"}, "remotipart_submitted"=>"true", "X-Requested-With"=>"IFrame", "X-Http-Accept"=>"text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01", "image_assets"=>{"avatar"=>[#<ActionDispatch::Http::UploadedFile:0x0000000656ee28 @original_filename="big_image.jpeg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"image_assets[avatar][]\"; filename=\"big_image.jpeg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/tmp/RackMultipart20140817-25517-1xcwosa>>, #<ActionDispatch::Http::UploadedFile:0x0000000656edb0 @original_filename="cool.jpeg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"image_assets[avatar][]\"; filename=\"cool.jpeg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/tmp/RackMultipart20140817-25517-t9skis>>, #<ActionDispatch::Http::UploadedFile:0x0000000656ed38 @original_filename="cool.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"image_assets[avatar][]\"; filename=\"cool.png\"\r\nContent-Type: image/png\r\n", @tempfile=#<File:/tmp/RackMultipart20140817-25517-16flp1w>>]}}
[Shard: slave_development_2]  User Load (2.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 7 LIMIT 1
[Shard: slave_development_1]  ActsAsTaggableOn::Tag Load (2.6ms)  SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" IS NULL AND "taggings"."taggable_type" = 'Image' AND (taggings.context = 'tags' AND taggings.tagger_id IS NULL)
   (1.0ms)  BEGIN
  PicCategory Load (49.2ms)  SELECT "pic_categories".* FROM "pic_categories" WHERE "pic_categories"."id" = $1 LIMIT 1  [["id", "2"]]
  SQL (48.3ms)  INSERT INTO "images" ("about", "avatar_processing", "created_at", "notified", "title", "updated_at", "user_id") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id"  [["about", "ddddddd"], ["avatar_processing", nil], ["created_at", Sun, 17 Aug 2014 09:03:17 UTC +00:00], ["notified", "NO"], ["title", "hiii"], ["updated_at", Sun, 17 Aug 2014 09:03:17 UTC +00:00], ["user_id", 7]]
  SOLR Request (782.4ms)  [ path=update parameters={} ]
  ActsAsTaggableOn::Tag Load (10.5ms)  SELECT "tags".* FROM "tags" WHERE (lower(name) = 'abstract')
  ActsAsTaggableOn::Tag Load (1.6ms)  SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" = 12 AND "taggings"."taggable_type" = 'Image' AND (taggings.context = 'tags' AND taggings.tagger_id IS NULL)
  ActsAsTaggableOn::Tagging Exists (2.7ms)  SELECT 1 AS one FROM "taggings" WHERE ("taggings"."tag_id" = 3 AND "taggings"."taggable_type" = 'Image' AND "taggings"."taggable_id" = 12 AND "taggings"."context" = 'tags' AND "taggings"."tagger_id" IS NULL AND "taggings"."tagger_type" IS NULL) LIMIT 1
  SQL (20.4ms)  INSERT INTO "taggings" ("context", "created_at", "tag_id", "taggable_id", "taggable_type", "tagger_id", "tagger_type") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id"  [["context", "tags"], ["created_at", Sun, 17 Aug 2014 09:03:19 UTC +00:00], ["tag_id", 3], ["taggable_id", 12], ["taggable_type", "Image"], ["tagger_id", nil], ["tagger_type", nil]]
   (1.2ms)  ROLLBACK
Completed 500 Internal Server Error in 1841ms

SystemStackError (stack level too deep):
  actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:70


  Rendered /home/ubuntu/.rvm/gems/ruby-1.9.3-p545@latest/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms)
  Rendered /home/ubuntu/.rvm/gems/ruby-1.9.3-p545@latest/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.3ms)
  Rendered /home/ubuntu/.rvm/gems/ruby-1.9.3-p545@latest/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (11.1ms)

i know,its very simple but i wont to add multiple image uploads using paperclip 3.5 on rails 3.2.BUT its not working and giving me SystemStackError (stack level too deep) error.i know there is something wrong with my associations but i tried hard to figure out but it seems right to me...so i decided to post this here to get some help as why its not working.or any other way to implement multiple uploads with single model

http://stackoverflow.com/questions/6483796/multiple-files-upload-with-rails-3-and-paperclip-on-heroku — Richard Peck, Aug 17 '14 at 10:26
thanks @RichPeck....but its not totally that i am looking for...why my code is not working...???any idea — Milind, Aug 17 '14 at 11:29

score 0 · Accepted Answer · answered Aug 17 '14 at 22:24

after struggling ...i figured out that it was the paperclip version 3.5.3 that was creating problem...so when i changed it to paperclip >= 4...there was no error and now i am able to save the parent and its association in a go....well i dont know what was the issue..but if you want to do the same ..go for higher version of paperclip

saving multiple images using accept_nested_attributes using paperclip in rails 3

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