Rails 4 STI saving nested model

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I'm using paperclip to store images on a model called asset.

Because I want to use these images when I create articles, I need to be able to upload (and create the models) before saving the actual post/article.

articles are a kind of posts, and are the only kinds of posts which can have assets - which is why I used STI in the first place. The problems arise when I try to save a nested asset through a call to @post.save in my PostsController.

This is a brief structure of my model hierarchy

- post.rb
  - article.rb
    -> has_many asset.rb
  - (other kind of post)

In order to upload images while creating an article I've declared assets as a root resource in my routes.rb:

# routes.rb
resources :posts
resources :assets

Though in my asset.rb class I have defined the belongs_to relationship:

#asset.rb  
class Asset
  belongs_to :article, class_name: 'Post', foreign_key: 'post_id'
end

And this is the table defined in schema.rb:

  create_table "assets", force: true do |t|
    t.integer  "post_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "image_file_name"
    t.string   "image_content_type"
    t.integer  "image_file_size"
    t.datetime "image_updated_at"
  end

However, the shit hits the fan when I try to save my newly created article in my PostsController:

def create
    # type_class yields Article in this particular case.
    @post = type_class.new(post_params)
    @post.author = current_user
    if @post.save
      redirect_to post_path(@post)
    else
      render 'new'
    end
  end

This yields the following error:

NoMethodError Exception: undefined method `article_id' for #<Asset:0x007fc3c9819568>

Any help would be greatly appreciated.

asked 42 secs ago

Nicolay

482