File uploads will not work in Ruby on Rails 3 using a multi-page form

Question

I have a very simple configuration for uploading files. I just want to upload an image to the database (I know, I know ...) with a description. It.

This is what my model looks like (which I learned from here ). Basically, this is exactly how the example is configured, only using the attr_protected line for Rails 3.2 to work:

 Photo < ActiveRecord::Base # note: there is also a :description attribute!! attr_protected :file_name, :content_type, :binary_data def image_file=(input_data) self.file_name input_data.original_filename self.content_type = input_data.content_type.chomp self.binary_data = input_data.read end end 

Here's what my very simple view looks like:

 <h1>New Photo</h1> <%= form_for(@photo) do |f| %> <fieldset> <legend>Upload a Photo</legend> <div class="control-group"> <label class="control-label">Photo</label> <div class="controls"> <%= f.file_field :image_file %> </div> </div> <div class="control-group"> <%= f.label :description, class: "control-label" %> <div class="controls"> <%= f.text_field :description, class: "text_field" %> </div> </div> <div class="form-actions"> <%= f.submit "Upload", class: "btn btn-primary" %> <%= link_to "Cancel", photos_path, class: "btn" %> </div> </fieldset> <% end %> 

And finally (just for completeness), here is my Create action (simple forests):

 def create @photo = Photo.new(params[:photo]) respond_to do |format| if @photo.save format.html { redirect_to @photo, notice: 'Photo was successfully created.' } format.json { render json: @photo, status: :created, location: @photo } else format.html { render action: "new" } format.json { render json: @photo.errors, status: :unprocessable_entity } end end end 

The idea is that the user selects a file and types a short description, which should be published in the Create method on the /photos controller. Unfortunately, when I click the "Submit" button, I get a very vague error that does not give me information about what the real problem is:

 ArgumentError in PhotosController#create wrong number of arguments (1 for 0) Rails.root: /Users/me/dev/photo-app Application Trace | Framework Trace | Full Trace app/models/photo.rb:4:in `image_file=' app/controllers/photos_controller.rb:43:in `new' app/controllers/photos_controller.rb:43:in `create' Request Parameters: {"utf8"=>"✓", "authenticity_token"=>"qSjMHgjCDo2ORmTvnujrljfPCj6oekLI9KAz4x5gA7Q=", "photo"=>{"image_file"=>#<ActionDispatch::Http::UploadedFile:0x00000101726fd0 @original_filename="SomePic.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"photo[image_file]\"; filename=\"SomePic.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/var/folders/kc/8hsmx29j3xn2_j_9tsw8bz6w0000gn/T/RackMultipart20121001-52387-lre7zh>>, "description"=>"my description"}, "commit"=>"Upload"} 

I went through all of Google and StackOverflow, but nothing seems like my (very simple) example. Any help would be greatly appreciated!

Thanks in advance!

Answer 1

I took @kiddorails advice and implemented CarrierWave along with Amazon Web Service . My project required downloading images, and I was limited to Geroku. So I went in and realized that. On the other hand, this is the best solution, but at that time it seemed redundant for my (approximate) project. It was hard for me (as a non-Ruby on Rails developer).

At the end of the day, I would recommend someone else who wants to store images in a database so as NOT to do this, and do the same thing as me. Find out the right way to do this. :)

Answer 2

Here, the image_file contains only the ActionDispatch object, not the contents and description of the file, as indicated in:

 "image_file" => #<ActionDispatch::Http::UploadedFile:0x00000101726fd0 original_filename="SomePic.jpg" 

This seems like an absurd way to upload a file. In any case, you will have to write the content to the download location by reading :tempfile