Rails - Dec 2007 - validates_file_format_of only when is there an image

i have a model with this:
file_column :image
validates_file_format_of :image, :in => ["gif", "png",
"jpg"]


If inthe form the user not insert the image i receive an error.
If i remove:
validates_file_format_of :image, :in => ["gif", "png",
"jpg"]
it works.

Is possible do the validation only when user insert the image in form?

i try with:
validates_file_format_of :image, :in => ["gif", "png",
"jpg"],:if
=>:image?
but it not works.

How i can do?

Thanks
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Luca Roma wrote:
> i have a model with this:
> file_column :image
> validates_file_format_of :image, :in => ["gif",
"png", "jpg"]
> 
> 
> If inthe form the user not insert the image i receive an error.
> If i remove:
> validates_file_format_of :image, :in => ["gif",
"png", "jpg"]
> it works.
> 
> Is possible do the validation only when user insert the image in form?
> 
> i try with:
> validates_file_format_of :image, :in => ["gif",
"png", "jpg"],:if
> =>:image?
> but it not works.
The option

   :allow_nil => true

should do the trick.

-- 
We develop, watch us RoR, in numbers too big to ignore.


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Didn''t seem to work for me.

On Dec 27, 7:10 am, Mark Reginald James
<m...-bzGI/hKkdgQnC9Muvcwxkw@public.gmane.org>
wrote:
> Luca Roma wrote:
> > i have a model with this:
> > file_column :image
> > validates_file_format_of :image, :in => ["gif",
"png", "jpg"]
>
> > If inthe form the user not insert the image i receive an error.
> > If i remove:
> > validates_file_format_of :image, :in => ["gif",
"png", "jpg"]
> > it works.
>
> > Is possible do the validation only when user insert the image in form?
>
> > i try with:
> > validates_file_format_of :image, :in => ["gif",
"png", "jpg"],:if
> > =>:image?
> > but it not works.
>
> The option
>
>    :allow_nil => true
>
> should do the trick.
>
> --
> We develop, watch us RoR, in numbers too big to ignore.
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chovy wrote:
> Didn''t seem to work for me.
> 
> On Dec 27, 7:10 am, Mark Reginald James wrote:
>> Luca Roma wrote:
>>> Is possible do the validation only when user insert the image in
form?
>>> i try with:
>>> validates_file_format_of :image, :in => ["gif",
"png", "jpg"],:if
>>> =>:image?
>>> but it not works.
>> The option
>>
>>    :allow_nil => true
>>
>> should do the trick.
That''s unexpected.  The image attribute should be nil if nothing
has been uploaded, and the validation should be skipped because
the :allow_nil is passed into the validates_each that''s used by
validates_file_format_of.

You could try :allow_blank => true instead.  But what''s been
working for me is a modified file_column that puts an
"unless value.blank?" inside the validates_each. I think I did
this before validates_each supported the allow_blank option.

So perhaps rather than :allow_nil, :allow_blank is needed,
although I''m not sure why because the no-image condition is
a nil attribute, not an empty string.

-- 
We develop, watch us RoR, in numbers too big to ignore.


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I''m actually using this with validates_format_of (neither allow_blank
or allow_nil work).


On Dec 28, 1:46 am, Mark Reginald James
<m...-bzGI/hKkdgQnC9Muvcwxkw@public.gmane.org>
wrote:
> chovy wrote:
> > Didn''t seem to work for me.
>
> > On Dec 27, 7:10 am, Mark Reginald James wrote:
> >> Luca Roma wrote:
> >>> Is possible do the validation only when user insert the image
in form?
> >>> i try with:
> >>> validates_file_format_of :image, :in => ["gif",
"png", "jpg"],:if
> >>> =>:image?
> >>> but it not works.
> >> The option
>
> >>    :allow_nil => true
>
> >> should do the trick.
>
> That''s unexpected.  The image attribute should be nil if nothing
> has been uploaded, and the validation should be skipped because
> the :allow_nil is passed into the validates_each that''s used by
> validates_file_format_of.
>
> You could try :allow_blank => true instead.  But what''s been
> working for me is a modified file_column that puts an
> "unless value.blank?" inside the validates_each. I think I did
> this before validates_each supported the allow_blank option.
>
> So perhaps rather than :allow_nil, :allow_blank is needed,
> although I''m not sure why because the no-image condition is
> a nil attribute, not an empty string.
>
> --
> We develop, watch us RoR, in numbers too big to ignore.
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