I just wanted to throw my answer in here as well as Stone's. I spent nearly two solid days getting this to work (Stone was right, it was a PITA!), so hopefully my solution will help someone. I did it just a touch different than Stone.
My app has Features (a comic, puzzle, text-column, etc) and FeatureAssets (individual comic panels/color versions, question & answer files for a specific crossword, etc). Since FeatureAssets are solely related to one Feature, I nested the models (as you'll see in my upload form).
The biggest problem for me was realizing that my params[:feature_asset] that was being sent to the server was actually an array of my uploader'd file objects, instead of just the one I was used to working with. After a bit of fiddling with iterating through each file and creating a FeatureAsset from it, it worked like a charm!
Hopefully I'll translate this clearly. I'd rather provide a bit too much information than not enough. A little extra context never hurts when you're interpreting someone else's code.
feature.rb
class Feature < ActiveRecord::Base
belongs_to :user
has_many :feature_assets
attr_accessible :name, :description, :user_id, :image
accepts_nested_attributes_for :feature_assets, :allow_destroy => true
validates :name, :presence => true
validates :user_id, :presence => true
mount_uploader :image, FeatureImageUploader
end
feature_asset.rb
belongs_to :user
belongs_to :feature
attr_accessible :user_id, :feature_id, :file, :file_cache
validates :user_id, :presence => true
validates :feature_id, :presence => true
validates :file, :presence => true
mount_uploader :file, FeatureAssetContentUploader
# grabs useful file attributes & sends them as JSON to the jQuery file uploader
def to_jq_upload
{
"file" => file,
"file_name" => 'asdf',
"url" => file.url,
"delete_url" => id,
"delete_type" => "DELETE"
}
end
feature_assets_controller.rb
def create
@feature = Feature.find(params[:feature_id])
params[:feature_asset]['file'].each do |f|
@feature_asset = FeatureAsset.create!(:file => f, :feature_id => @feature.id, :user_id => current_user.id)
end
redirect_to @feature
end
And not that it probably helps that much, but my feature_asset_uploader.rb is below. It's pretty stripped down.
class FeatureAssetContentUploader < CarrierWave::Uploader::Base
storage :file
end
features _form.html.erb (similar to Stone's, but not quite)
<%= form_for [@feature, @feature_asset], :html => { :multipart => true } do |f| %>
<div class="row" id="fileupload">
<div class=" fileupload-buttonbar">
<div class="progressbar fileupload-progressbar nofade"><div style="width:0%;"></div></div>
<span class="btn btn-primary fileinput-button">
<i class="icon-plus"></i>
<span><%= t('feature_assets.add_files') %>...</span>
<%= hidden_field_tag :feature_id, @feature.id %>
<%= hidden_field_tag :user_id, current_user.id %>
<%= f.file_field :file, :multiple => true %>
</span>
<button type="submit" class="btn btn-success">Start Upload</button>
<button type="reset" class="btn btn-warning">Cancel Upload</button>
<button type="button" class="btn btn-danger">Delete Files</button>
</div>
</div>
It doesn't have error handling or any of the niceties it should have, but that's the barebones version of it.
Hopefully that helps someone out there. Feel free to ask me if you have any questions!
Kyle
