Attachment_fu and nested model forms

Rails
1

Has anyone successfully used attachment_fu with rails 2.3 nested model
forms?

I’ve never used attachment_fu before so I may be doing something wrong
there not sure. Here’s what I’ve got:

class Product < ActiveRecord::Base
has_one :cover_image
accepts_nested_attributes_for :cover_image, :allow_destroy => true
end

class CoverImage < ActiveRecord::Base
has_attachment :content_type => :image,
:storage => :file_system,
:path_prefix => 'public/images/covers
end

standard rest controller action:
def create
@product = Product.new(params[:product])

respond_to do |format|
  if @product.save
    flash[:notice] = 'Product was successfully created.'
    format.html { redirect_to(@product) }
    format.xml  { render :xml => @product, :status

=> :created, :location => @product }
else
format.html { render :action => “new” }
format.xml { render :xml => @product.errors, :status
=> :unprocessable_entity }
end
end
end

and the new form:

<% form_for(:product, :url => products_path, :html => { :multipart =>
true }) do |f| %>
…
…
<% f.fields_for(:cover_image) do |c| %>
<%= c.file_field :uploaded_data %>
<% end %>
…
…
<% end %>

On submitting the form I get this error:
ActiveRecord::AssociationTypeMismatch (CoverImage(#70223327600060)
expected, got HashWithIndifferentAccess(#70223341431440)):

Any thoughts greatly appreciated!
Tim

2

On Thu, Feb 26, 2009 at 9:35 PM, Tim [email protected] wrote:

Has anyone successfully used attachment_fu with rails 2.3 nested model
forms?

Yes.

                       :storage          => :file_system,
                       :path_prefix    => 'public/images/covers

end

Maybe you just omitted this, but I think your CoverImage should declare
belongs_to :product

standard rest controller action:

   format.html { render :action => "new" }

…
…
<% f.fields_for(:cover_image) do |c| %>
<%= c.file_field :uploaded_data %>
<% end %>
…
…
<% end %>

Since you have @product in your controller, why not just use that in
form_for? Doing so will allow you to omit :url => products_path. Thus,
you’d
have

<% form_for(@product, :html => { :multipart => true }) do |f| %>

On submitting the form I get this error:
ActiveRecord::AssociationTypeMismatch (CoverImage(#70223327600060)
expected, got HashWithIndifferentAccess(#70223341431440)):

Any thoughts greatly appreciated!

I don’t know if any of that solves your problem, but that’s how I’d do
it.
Also, I relied on Ryan Daigle’s blog post when I was doing nested
models/forms. Check it out:

http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes

Regards,
Craig

3

Maybe you just omitted this, but I think your CoverImage should declare
belongs_to :product

Thanks for the idea Craig. Thought we were on to something there for
a second but apparently not.

The update seems to work just not the create. If I change the create
method to this: (yes I changed my image class and relationship names)

def create
params[:product][:image] = ProductImage.new(params[:product]
[:image])
@product = Product.new(params[:product])

respond_to do |format|
  if @product.save
    flash[:notice] = 'Product was successfully created.'
    format.html { redirect_to(admin_products_path) }
    format.xml  { render :xml => @product, :status

=> :created, :location => @product }
else
format.html { render :action => “new” }
format.xml { render :xml => @product.errors, :status
=> :unprocessable_entity }
end
end
end

it works fine and the update works as expected with a standard REST
action.

I also noticed that if I change the image relationship to has_many the
form fields aren’t getting indexed so I end up with this:

instead of this:

etc…

I dunno seems like there must be something really fundamental that I’m
missing.

Help:-)!

4

I found your post and was having the same issue. I was able to solve it
by adding “_attributes” to the nested model in the form:

<% form_for(:product, :url => products_path, :html => { :multipart =>
true }) do |f| %>
…
…
<% f.fields_for(:cover_image_attributes) do |c| %>
<%= c.file_field :uploaded_data %>
<% end %>
…
…
<% end %>

For some reason, Rails, or attachment_fu are missing that link. I wrote
a post about it

.

I dunno seems like there must be something really fundamental that I’m
missing.