Rails - Aug 2005 - (newbie) accessing file_column to save a thumbnail

hi sebastian,
man, I hope you don''t mind me bothering you with all these  
questions... I''m working on a project where file uploads are central  
to the app, and so I''m using FileColumn a lot!

so, I got RMagick working (after several days of pain), and now I''m  
getting to the part of creating thumbnails on uploads...

for this, I would like to access the path to the directory where  
file_column is storing the final copy of the file, so that I can have  
rmagick write to it.

my question would be: how can I adapt file_column.rb so that it would  
add a file_relative_dir method, like the current file_relative_path  
one? I''ve been studying file_column.rb, but my current ruby knowledge  
is less than basic, and I haven''t been able to figure this on my
own....

thanks
oliver

Hi Oliver,

On 8/31/05, oliver barnes
<ol1barn3s-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> man, I hope you don''t mind me bothering you with all these
> questions... I''m working on a project where file uploads are
central
> to the app, and so I''m using FileColumn a lot!
I''m glad it is of use to you.
> so, I got RMagick working (after several days of pain), and now
I''m
> getting to the part of creating thumbnails on uploads...
> 
> for this, I would like to access the path to the directory where
> file_column is storing the final copy of the file, so that I can have
> rmagick write to it.
> 
> my question would be: how can I adapt file_column.rb so that it would
> add a file_relative_dir method, like the current file_relative_path
> one? I''ve been studying file_column.rb, but my current ruby
knowledge
> is less than basic, and I haven''t been able to figure this on my
own....
If your column is named "image", @photo.image will give you a string
with the file''s absolute path. You can use Ruby''s File#dirname
method
to get the directory. I suggest you generate the thumbnail in an
after-save callback, as the final directory cannot be created earlier
as it contains the primary key.

This is one of the things I want to support better in a future
release. So stay tuned.

Sebastian

hey sebastian,

afterall I ended up going the after_save way you mentioned, and  
almost got it working now... I posted the glitches on another thread.

will definetly stay tuned, and anything I could do to help in your  
work with FC, please let me know, I''d be glad to contribute in some  
way if I can.

thanks
oliver


On Sep 3, 2005, at 6:42 AM, Sebastian Kanthak wrote:
> Hi Oliver,
>
> On 8/31/05, oliver barnes
<ol1barn3s-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>> man, I hope you don''t mind me bothering you with all these
>> questions... I''m working on a project where file uploads are
central
>> to the app, and so I''m using FileColumn a lot!
>>
>
> I''m glad it is of use to you.
>
>
>> so, I got RMagick working (after several days of pain), and now
I''m
>> getting to the part of creating thumbnails on uploads...
>>
>> for this, I would like to access the path to the directory where
>> file_column is storing the final copy of the file, so that I can have
>> rmagick write to it.
>>
>> my question would be: how can I adapt file_column.rb so that it would
>> add a file_relative_dir method, like the current file_relative_path
>> one? I''ve been studying file_column.rb, but my current ruby
knowledge
>> is less than basic, and I haven''t been able to figure this on
my
>> own....
>>
>
> If your column is named "image", @photo.image will give you a
string
> with the file''s absolute path. You can use Ruby''s
File#dirname method
> to get the directory. I suggest you generate the thumbnail in an
> after-save callback, as the final directory cannot be created earlier
> as it contains the primary key.
>
> This is one of the things I want to support better in a future
> release. So stay tuned.
>
> Sebastian
>