Image uploading isn't working using embedded documents

[krema]

I have problems with uploading pictures. It works only if the mount_uploader is directly set in the band model.

view:

-form_for :band, url(:bands, :create), :class => 'form-horizontal', :html => { :multipart => true } do |f|
  - f.fields_for :file do |image|
    =image.file_field :file

models:

class Band
  include Mongoid::Document
  field :name
  embeds_one :file, autobuild: true, cascade_callbacks: true, as: :photographic, class_name => 'Picture'
  accepts_nested_attributes_for :file, :allow_destroy => true
end

class Picture
  include Mongoid::Document
  embedded_in :photographic, polymorphic: true
  mount_uploader :file, Uploader
end

controller:

@band.update_attributes!(params[:band])

getting following params:

"band"=>{
    "file_attributes"=>{
        "file"=>"test.gif", 
        "id"=>"524afdbbe72db15a7300000e"
     }, 
     "name"=>"Test"
}

[krema]

Finally I switched from Padrino to Rails and now it is working!

[rmm5t]

@croonix Thanks for the report. I have almost zero experience with Padrino. If Padrino was something that was expected to work (because it would have worked with just vanilla Carrierwave and ActiveRecord), I'm open to a pull-request and accompanying unit test.

[krema]

ok thank you! I have the same issue if I am using third-nested embedded documents with rails3.
Double nested documents are working.

[rmm5t]

Just triple-deep embedded docs or also in combination with nested_attributes?

[krema]

I've created a repository croonix/carrierwave_test for testing. Could you please clone this example project for me and check if it's working? I've tried to reproduce this behavior but now I'm getting the error

"undefined method `__bson_dump__' for #<ActionDispatch::Http::UploadedFile:0x007fab02245130>"

[kernelzin]

You may got here looking for the cascade_callbacks: true solution:
carrierwaveuploader/carrierwave#81

[alexkravets]

Problem happens to be in https://github.com/carrierwaveuploader/carrierwave-mongoid/blob/master/lib/carrierwave/mongoid.rb:

def find_previous_model_for_#{column}
          if self.embedded?
            ancestors       = [[ self.metadata.key, self._parent ]].tap { |x| x.unshift([ x.first.last.metadata.key, x.first.last._parent ]) while x.first.last.embedded? }

self.metadata does not exists while:

@object.assign_attributes( permit_params )
@object.save

So as a temporary fix I override find_previous_model_for_ method replacing self.metadata.key and x.first.last.metadata.key with relation name, in my case it's :location.

Does anybody know why metadata is missing?

[Goltergaul]

its __metadata in mongoid 4 i think

[Goltergaul]

see #121

[rmm5t]

Closing stale issues.