Rails - May 2006 - file_column - url_for_file_column issue.

Hi,

url_for_file_column @variable, ''name'', takes an instance
variable.  My
question is, what if I don''t want to have to retrieve the instance
variable
every single time but I have the image id, along with its name with me.
Could I contruct that object in a view and pass it to url_for_file_column:

<% @picture = Picture.new %>
     @picture.id = ...
     @picture.name = ...
%>

and then pass @picture in?  I tried this but when I tried the name
assignment, I got the following:

Do not know how to handle a string with value ''somename.jpg''
that was passed
to a file_column.

Thanks.
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Sam Donaldson wrote:
> Hi,
>  
> url_for_file_column @variable, ''name'', takes an instance
variable.  My
> question is, what if I don''t want to have to retrieve the instance
> variable every single time but I have the image id, along with its name 
> with me.  Could I contruct that object in a view and pass it to 
> url_for_file_column:
>  
> <% @picture = Picture.new %>
>      @picture.id <http://picture.id> = ...
>      @picture.name <http://picture.name> = ...
> %>
>  
> and then pass @picture in?  I tried this but when I tried the name 
> assignment, I got the following:
>  
> Do not know how to handle a string with value
''somename.jpg'' that was
> passed to a file_column.
I''m pretty sure (away from devbox at the moment) that a file_column 
field actually wants to be passed a FileIO (or StringIO, I think) object 
so that it can handle the actual data.

In this case, you may well be better off either creating a mock class 
that supports the methods that url_for_file_column requires (which I 
*think* will be limited to name, id and class), or writing your own 
helper to use instead of url_for_file_column.

-- 
Alex