File Upload

Rails
1

Hello all,

Has anyone got some tips on validating files when uploaded?
Validation in the model is a lot cleaner than in the controller and
therefore I was hoping to retain this balance when uploading files.

Has anyone found file upload validation as implemented in the model?

2

On Dec 18, 6:42 am, “[email protected]” [email protected]
wrote:

Hello all,

Has anyone got some tips on validating files when uploaded?
Validation in the model is a lot cleaner than in the controller and
therefore I was hoping to retain this balance when uploading files.

Has anyone found file upload validation as implemented in the model?

What kind of validations do you want to do?

3

Thanks for the response Chovy.
Firstly there is a file uploaded and secondly to check that the file
does not contain zero bites.
I would like to keep everything in the model if possible.

j

4

On Dec 24, 10:23 pm, Chris O. [email protected]
wrote:

has_attachment call through the :size parameter, ex :size =>
At least these are a couple of ways to do it.

I find that attachment_fu doesn’t give informative error messages,
aside from “Picture is invalid”.

5

[email protected] wrote:

Thanks for the response Chovy.
Firstly there is a file uploaded and secondly to check that the file
does not contain zero bites.
I would like to keep everything in the model if possible.

j

It depends a little on how you are performing the uploads. If you are
using attachment_fu, as I do, you can set the size range within the
has_attachment call through the :size parameter, ex :size =>
10…1000.bytes. You can also insert a custom validation expression
within one of the validate methods, ex.

def validate
unless self.filename.blank?
errors.add_to_base(“Invalid file size”) unless
(10.kilobytes…10.megabytes).include?(self.size)
end
end

At least these are a couple of ways to do it.

6

chovy wrote:

On Dec 24, 10:23 pm, Chris O. [email protected]
wrote:

has_attachment call through the :size parameter, ex :size =>
At least these are a couple of ways to do it.

I find that attachment_fu doesn’t give informative error messages,
aside from “Picture is invalid”.

To be honest I too don’t like the way attachment_fu throws all the
validation messages at once, which is why I like to put everything in
the validate method and exclude the validates_as_attachment call. Then
you have total control of what messages get shown to the users, although
I have never seen a generic message like “Picture is invalid before”.