I think my question was a bit unclear.

What i mean this when you want to browse for a file to upload, a window
pops up, which allows you to select a file from your computer.

Inside this window i want only image extensions able to be selected.

Example:
When you want to send a file attachment on facebook in a message, you can
select any file.
When you want to send a image attachment, you can only select image files


On Thu, Dec 12, 2013 at 5:47 PM, Leonel Câmara <[email protected]>wrote:

> I would save the extension in another field, which would be computed from
> your file field, then you can use regular selects to find them.
>
> A less efficient in terms of query speed (it does use less storage)
> alternative is to use some of these operators
>
> http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#like,-regexp,-startswith,-contains,-upper,-lower
>
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