Rails - Jan 2006 - Clearing a file_column-type field

So I am now able to set/upload an image to my app using file_column, 
with a little bit of a change to the code.

I can change the image using an Edit page, but I''m trying to figure out
what to do if the user wants to remove the image. I tried adding a 
Remove Image link in my list, but I''m not sure what to do in the 
remove_image method in my controller. I tried setting the
''image'' value
to ''''; I tried using update_attribute to set to
'''' and neither did
anything. The SQL update command that was logged just showed it 
replacing the records values with the same data - ie. not changing 
anything.

I tried doing an update_attribute to "", but I got an error from 
file_column:

(Do not know how to handle a string with value ''nothing'' that
was passed
to a file_column. Check if the form''s encoding has been set to 
''multipart/form-data''.)

Yeah, newbie... ;)

(And I haven''t even added a second relationship table to my app 
yet..figured this would be the easy part.)

Thanks.

jt

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

This works for me:

ModelName.find(your_parameters_here).update_attribute
:your_image_column_name, nil

doppler

On 1/22/06, John Tsombakos <johnts@charter.net>
wrote:
>
> So I am now able to set/upload an image to my app using file_column,
> with a little bit of a change to the code.
>
> I can change the image using an Edit page, but I''m trying to
figure out
> what to do if the user wants to remove the image. I tried adding a
> Remove Image link in my list, but I''m not sure what to do in the
> remove_image method in my controller. I tried setting the
''image'' value
> to ''''; I tried using update_attribute to set to
'''' and neither did
> anything. The SQL update command that was logged just showed it
> replacing the records values with the same data - ie. not changing
> anything.
>
> I tried doing an update_attribute to "", but I got an error from
> file_column:
>
> (Do not know how to handle a string with value ''nothing''
that was passed
> to a file_column. Check if the form''s encoding has been set to
> ''multipart/form-data''.)
>
> Yeah, newbie... ;)
>
> (And I haven''t even added a second relationship table to my app
> yet..figured this would be the easy part.)
>
> Thanks.
>
> jt
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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David Rose wrote:
> This works for me:
> 
> ModelName.find(your_parameters_here).update_attribute
> :your_image_column_name, nil
> 
> doppler
@user = User.find(1)
@user.your_file_column = nil
@user.save


Gokhan Arli
www.sylow.net

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

Thanks! Those both worked.

I had something like that, but was getting an error - which actually 
turned out to be in my "show" method - it was trying to display the 
image tag, but the field was nil. Now it checks and works.

jt

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