Rails - Jun 2006 - File is nil

I don''t understand why my program does not get the file that I try to 
upload.
It returns the following error when I try to upload a small file:

  NoMethodError in LogfileController#create

  You have a nil object when you didn''t expect it!
  The error occured while evaluating nil.original_filename

  #{RAILS_ROOT}/app/models/logfile.rb:9:in `file=''
  #{RAILS_ROOT}/app/controllers/logfile_controller.rb:31:in `create''

  Request
  Parameters: {"logfile"=>
{"fileName"=>#<StringIO:0x39c3fc0>},
               "commit"=>"Create"}


This is the code in view:

   <%= form_tag({:action => ''simple_save''},
                {:method => "post", :multipart => true}) %>
      <input type="file" name="logfile_fileName" />
      <%= submit_tag "Simple Save" %>
   <%= end_form_tag %>

This is the code in the controller:

   def create
      ...
      @logfile.file= @params[''logfile_fileName'']
      ...
   end

And the Model is nearly identical to the code in here:

   http://www.bigbold.com/snippets/posts/show/1805

Is it because I don''t have a file field in my database?  The database 
keeps the name of the file and some information related to it.  I want 
to save the file locally only, not to the database.

Please help!  I''ve been stuck for DAYS.

Thank you in advance.

-- 
Posted via http://www.ruby-forum.com/.

Oh. My. Goodness.

What was missing was the the length of character input the html.
So I went overboard with the input size.

My view now reads:
<input type="file" id="logfile_file"
name="logfile[file]" size="200"/>

-- 
Posted via http://www.ruby-forum.com/.

It''s not `@params[''logfile_fileName'']` but
`params[:logfile]["fileName"]`

On 6/7/06, Lisa <maneneko@yahoo.com> wrote:
> I don''t understand why my program does not get the file that I try
to
> upload.
> It returns the following error when I try to upload a small file:
>
>   NoMethodError in LogfileController#create
>
>   You have a nil object when you didn''t expect it!
>   The error occured while evaluating nil.original_filename
>
>   #{RAILS_ROOT}/app/models/logfile.rb:9:in `file=''
>   #{RAILS_ROOT}/app/controllers/logfile_controller.rb:31:in
`create''
>
>   Request
>   Parameters: {"logfile"=>
{"fileName"=>#<StringIO:0x39c3fc0>},
>                "commit"=>"Create"}
>
>
> This is the code in view:
>
>    <%= form_tag({:action => ''simple_save''},
>                 {:method => "post", :multipart => true})
%>
>       <input type="file" name="logfile_fileName"
/>
>       <%= submit_tag "Simple Save" %>
>    <%= end_form_tag %>
>
> This is the code in the controller:
>
>    def create
>       ...
>       @logfile.file= @params[''logfile_fileName'']
>       ...
>    end
>
> And the Model is nearly identical to the code in here:
>
>    http://www.bigbold.com/snippets/posts/show/1805
>
> Is it because I don''t have a file field in my database?  The
database
> keeps the name of the file and some information related to it.  I want
> to save the file locally only, not to the database.
>
> Please help!  I''ve been stuck for DAYS.
>
> Thank you in advance.
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

Here''s your problem:

2006/6/7, Lisa <maneneko@yahoo.com>:
>
>   Request
>   Parameters: {"logfile"=>
{"fileName"=>#<StringIO:0x39c3fc0>},
>                "commit"=>"Create"}
>       @logfile.file= params[''logfile_fileName'']
You''re tring to access the ''logfile_fileName'' key of
params, but
params only has a ''logfile'' and a ''commit''
key. But, the param
''logfile'' is itself a hash, with a key
''fileName'', so what you really
want is:

@logfile.file= params[''logfile''][''fileName'']

When you have an underscore in the param name, Rails groups the params
by prefix. Here, the prefix is ''logfile'', so you get a hash
saved
under ''logfile'' with all the params which start
''logfile_'', rather
than accessing the params ''logfile'' itself.

This is especially useful when, say, you want to create two model
objects, and you want to initialise them from a hash. This way you can
have fileds ''alpha_name'', ''alpha_address''
and ''beta_name'' and
''beta_age'', which will give you two hashes,
params[''alpha''] and
params[''beta'']. Have a look in the documentation under form
helpers to
learn more about how this works.

hth,
Douglas

Hi --

On Wed, 7 Jun 2006, Lisa wrote:
> I don''t understand why my program does not get the file that I try
to
> upload.
> It returns the following error when I try to upload a small file:
>
>  NoMethodError in LogfileController#create
>
>  You have a nil object when you didn''t expect it!
>  The error occured while evaluating nil.original_filename
>
>  #{RAILS_ROOT}/app/models/logfile.rb:9:in `file=''
>  #{RAILS_ROOT}/app/controllers/logfile_controller.rb:31:in
`create''
>
>  Request
>  Parameters: {"logfile"=>
{"fileName"=>#<StringIO:0x39c3fc0>},
>               "commit"=>"Create"}
[...]
>      @logfile.file= @params[''logfile_fileName'']
Those don''t match.  Try:

   @logfile.file =
params[''logfile''][''fileName'']


David

-- 
David A. Black (dblack@wobblini.net)
* Ruby Power and Light, LLC (http://www.rubypowerandlight.com)
   > Ruby and Rails consultancy and training
* Author of "Ruby for Rails" from Manning Publications!
   > http://www.manning.com/black

Thank you all so much!

Everyone in the Ruby community has been so helpful.

I have to admit this is scaffold withdrawal, but I honestly tried to 
read the documentation (I just didn''t know where to start).  Much of it
is still magic and mystics to me, but I hope to become better at it.

Thanks again.

Lisa

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