Rails - May 2006 - File Upload problem when file is small, under 19k(read method returns nothing)

Hi

I hope someone can shed some light on this have searched a lot but found 
nothing definite.  This happens on Ubuntu and Fedora 2.

I am having a problem with uploading small files (images gif or jpeg 
under 19k).

According to ruby documentation these are stored temporarily as StringIO 
objects rather than temporary files (as is done with the larger file 
uploads).

The problem is that when it is a StringIO rather than a temporary file 
nothing is returned from the read method.

example code where "image" is the file upload form parameter, it works
fine if image is over round 19k but is it is smaller then image.read 
returns nothing however the image.size and image.original_filename 
return the correct information.

File.open(path_to_save_file, "wb") {|f| f.write(image.read) }

All the best
Ant

-- 
Ant Peacocke
 
www.levelsystems.net
T:  + 33 (0) 8 70 46 63 37
M:  + 33 (0) 6 09 81 06 00

Hi

I hope someone can shed some light on this have searched a lot but found 
nothing definite.  This happens on Ubuntu and Fedora 2.

I am having a problem with uploading small files (images gif or jpeg 
under 19k).

According to ruby documentation these are stored temporarily as StringIO 
objects rather than temporary files (as is done with the larger file 
uploads).

The problem is that when it is a StringIO rather than a temporary file 
(ie a file smaller than 19k) nothing is returned from the read method.

example code where "image" is the file upload form parameter, it works
fine if image is over round 19k but is it is smaller then image.read 
returns nothing however the image.size and image.original_filename 
return the correct information.

File.open(path_to_save_file, "wb") {|f| f.write(image.read) }

All the best
Ant

-- 
Ant Peacocke
 
www.levelsystems.net
T:  + 33 (0) 8 70 46 63 37
M:  + 33 (0) 6 09 81 06 00

Ant Peacocke wrote:
> example code where "image" is the file upload form parameter, it
works
> fine if image is over round 19k but is it is smaller then image.read
> returns nothing however the image.size and image.original_filename
> return the correct information.
> 
> File.open(path_to_save_file, "wb") {|f| f.write(image.read) }
I haven''t seen this myself, so I''m puzzled.

Have you tried doing image.rewind before trying to read the image 
IOString?

--Al Evans

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

Many thanks Al

that fixed the problem, by putting image.rewind before image.read it now 
reads the file contents regardless of whether they are small or large. eg.

image.rewind

File.open(path_to_save_file, "wb") {|f| f.write(image.read) }


Thanks again Ant


Al Evans wrote:
> Ant Peacocke wrote:
>
>   
>> example code where "image" is the file upload form parameter,
it works
>> fine if image is over round 19k but is it is smaller then image.read
>> returns nothing however the image.size and image.original_filename
>> return the correct information.
>>
>> File.open(path_to_save_file, "wb") {|f| f.write(image.read) }
>>     
>
> I haven''t seen this myself, so I''m puzzled.
>
> Have you tried doing image.rewind before trying to read the image 
> IOString?
>
> --Al Evans
>
>   
-- 
Ant Peacocke
 
www.levelsystems.net
T:  + 33 (0) 8 70 46 63 37
M:  + 33 (0) 6 09 81 06 00