Rails - Aug 2006 - Upload forms--where is the file object?

Hi All,

I''ve been trying to create an upload form page that will take an
uploaded file, and save it to a directory on the server. I''ve tried
following a couple of posts on this list, and the HowTo from here:

http://wiki.rubyonrails.org/rails/pages/HowtoUploadFiles

Here is the code in my view:

<%= start_form_tag ( {:action => "upload"}, { :mulipart =>
true }  ) %>
<%= file_field_tag("file") %>
<%= submit_tag "Upload" %>
<%= end_form_tag % >

Seems simple enough, But the problem is the object being passed from the
view in params[:file] is a string object, not a file object, so it
won''t
respond to any of the methods from the File class in my controller code.
I get  a runtime error saying  the method is undefined for a string
object.  So my question is if params[:file] is just a string containing
the filename, how do I access the File object and the data in the file?

Thanks in advance for any responses.

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Dan,

I think you just have a typo..."mulipart" should be
"multipart".  Also, check the format of the
"start_form_tag"...try,

<%= form_tag({:action => ''upload''}, :multipart =>
true) %>

If you have it, AWDWR v2 has a good write-up on this functionality.  There is
"magic" required in the model to manipulate the file. Hope this helps.

Nathan

-----Original Message-----
From: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org]On Behalf Of Dan
Sent: Wednesday, August 02, 2006 11:52 AM
To: rails@lists.rubyonrails.org
Subject: [Rails] Upload forms--where is the file object?


Hi All,

I''ve been trying to create an upload form page that will take an
uploaded file, and save it to a directory on the server. I''ve tried
following a couple of posts on this list, and the HowTo from here:

http://wiki.rubyonrails.org/rails/pages/HowtoUploadFiles

Here is the code in my view:

<%= start_form_tag ( {:action => "upload"}, { :mulipart =>
true }  ) %>
<%= file_field_tag("file") %>
<%= submit_tag "Upload" %>
<%= end_form_tag % >

Seems simple enough, But the problem is the object being passed from the
view in params[:file] is a string object, not a file object, so it
won''t
respond to any of the methods from the File class in my controller code.
I get  a runtime error saying  the method is undefined for a string
object.  So my question is if params[:file] is just a string containing
the filename, how do I access the File object and the data in the file?

Thanks in advance for any responses.

-- 
Posted via http://www.ruby-forum.com/.
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Hi Dan,

Dan wrote:
> I''ve been trying to create an upload form page that will take an
> uploaded file, and save it to a directory on the server.
>
> But the problem is the object being passed from the
> view in params[:file] is a string object, not a file object,
> so it won''t respond to any of the methods from the File
> class in my controller code.
Depending on the size of the file being uploaded, it will either come back 
as a string object (if it''s smaller than about 12KB I think) or as a
file
object.  Use the code below in your controller to handle both cases.

if params[:file_to_upload].instance_of?(Tempfile)
   FileUtils.copy(params[:file_to_upload].local_path, 
"#{RAILS_ROOT}/public/#{@filenametouse}")
else
 
File.open("#{RAILS_ROOT}/public/#{@filenametouse}","w"){|f|
    f.write(params[:file_to_upload].read)
    f.close}
end

hth,
Bill

Dan wrote:
> Hi All,
> 
> I''ve been trying to create an upload form page that will take an
> uploaded file, and save it to a directory on the server. I''ve
tried
> following a couple of posts on this list, and the HowTo from here:
> 
> http://wiki.rubyonrails.org/rails/pages/HowtoUploadFiles
> 
> Here is the code in my view:
> 
> <%= start_form_tag ( {:action => "upload"}, { :mulipart
=> true }  ) %>
> <%= file_field_tag("file") %>
> <%= submit_tag "Upload" %>
> <%= end_form_tag % >
> 
> Seems simple enough, But the problem is the object being passed from the
> view in params[:file] is a string object, not a file object, so it
won''t
> respond to any of the methods from the File class in my controller code.
> I get  a runtime error saying  the method is undefined for a string
> object.  So my question is if params[:file] is just a string containing
> the filename, how do I access the File object and the data in the file?
> 
> Thanks in advance for any responses.
There''s actually a thread on this going on right now:

http://www.ruby-forum.com/topic/75360#new

-Ben Lisbakken

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