Question

I have a model submission and a nested model attachment

in submission.rb:

has_many :assets, :dependent => :destroy
accepts_nested_attributes_for :assets, :allow_destroy => true

in assets.rb :

  attr_accessible :file_id, :attachment
  belongs_to :submission
  has_attached_file :attachment

in my submission controller:

def new
    @submission = Submission.new
    @asset = 2.times{ @submission.assets.build }

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @submission }
    end
  end

  def edit
    @submission = Submission.find(params[:id])
    @asset = 2.times{ @submission.assets.build }
  end

And I’m getting a unknown attribute: submission_id error.

What could possibly be wrong here.

I’m following the screencast here:
http://www.emersonlackey.com/article/rails-paperclip-multiple-file-uploads

Answer 1

Seems submission_id is not present in your assets table.

You have to generate asset model like:

rails generate model Asset submission_id:integer #rails 3

And then run:

bundle exec rake db:migrate #rails 3