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Tim

2009-Feb-27 02:35 UTC

attachment_fu and nested model forms

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
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Craig Demyanovich

2009-Feb-27 05:43 UTC

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Re: attachment_fu and nested model forms

On Thu, Feb 26, 2009 at 9:35 PM, Tim
<mcintyre.tim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Has anyone successfully used attachment_fu with rails 2.3 nested model
> forms?

Yes.

> 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

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

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 %>

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

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Tim

2009-Feb-27 17:02 UTC

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Re: attachment_fu and nested model forms

> 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:
<input id="product_image_uploaded_data" name="product[image]
[uploaded_data]" size="30" type="file" />

instead of this:
<input id="product_image_0_uploaded_data"
name="product[image][0]
[uploaded_data]" size="30" type="file" />
etc...

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

Help:-)!
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Brandon Harris

2009-Oct-19 02:53 UTC

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Re: attachment_fu and nested model forms

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 
http://brandon-harris.com/2009/10/18/nested-model-forms-and-attachment-fu 
.
> I dunno seems like there must be something really fundamental that
I''m
> missing.
-- 
Posted via http://www.ruby-forum.com/.

Rails - Feb 2009 - attachment_fu and nested model forms

attachment_fu and nested model forms

Re: attachment_fu and nested model forms

Re: attachment_fu and nested model forms

Re: attachment_fu and nested model forms