Rails form file upload newbie issue

Question

I have an issue retrieving my file upload information. I am just starting to learn Rails.

I am using ruby 2.0.0p0 And Rails 4.0.0.beta1

Here is my form:

<%= form_for(@person, :html => { :multipart => true }) do |f| %>
<div class="field">
  <%= f.label :photo %><br />
  <%= f.file_field :photo %>
</div>
<div class="actions">
  <%= f.submit %>
</div>
<% end %>

And in my person.rb model:

def photo=(file_data)
logger.debug("PHOTO")
logger.debug(file_data)
logger.debug("END OUTPUT PHOTO")
unless file_data.blank?
  @file_data = file_data
  self.extension = file_data.original_filename.split('.').last.downcase
end
end

I can see in my console that nothing happens (no "PHOTO" output), the photo method is never called. Why is that?

When I looked in the console I also saw this line that got me worried:

Unpermitted parameters: photo

What does that mean?

If you are just starting to learn Rails, I wouldn't be using the Rails 4 beta until it's officially released. The exact problem you're running into likely wouldn't have happened in Rails 3.2. — Dylan Markow
– Dylan Markow, Commented Mar 31, 2013 at 14:44
You are right. I guess I didn't pay attention when I installed Rails. I will try to switch back to 3 (my learning book is for Rails 3 anyway) — nax_
– nax_, Commented Mar 31, 2013 at 14:51

Dylan Markow · Accepted Answer · 2013-03-31 14:51:55Z

3

In your controller, where you're dealing with params, you need to use .permit to list the attributes the form is allowed to post:

@person = Person.new(params.require(:person).permit(:photo))

Alternatively, if you used Rails' scaffolding generator, you might instead have a person_params method where you would need to add the :photo attribute:

def person_params
  params.require(:person).permit(:photo, :name, etc...)
end

edited Mar 31, 2013 at 14:51

answered Mar 31, 2013 at 14:45

Dylan Markow

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1 Comment

nax_ Over a year ago

Yes, found it. Makes a lot of sense. Thank you.

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