Question

I’m using CarrierWave in a Rails3 app to upload assets. All good on the upload side, but when the destroy method is invoked, the corresponding asset is not removed.

It looks like CarrierWave creates dynamic methods for this that one can use in the destroy method so if the model is avatar then methods like remove_avatar spring into existence.

However, I can’t get any of that to work. Any hints much appreciated.

Answer 1

I’m sorry to answer my own question, but in my case, it was a simple case of overlooking the obvious: The CarrierWave model needed a string field to contain the path name. So my model is:

class SiteAsset < ActiveRecord::Base
  mount_uploader :asset, AssetUploader

  def store_dir
    'public/assets'
  end

  def extension_white_list
    %w(jpg jpeg gif png pdf doc docx xls xlsx)
  end
end

and the correct migration was:

class CreateSiteAssets < ActiveRecord::Migration
  def self.up
    create_table :site_assets do |t|
      t.string :title
      t.string :asset
      t.timestamps
    end
  end

  def self.down
    drop_table :site_assets
  end
end

The missing part of the incantation was that the “asset” string was missing in my migration. I guess I was just not seeing the requirement in the documents although good sense would have made it immediately obvious.