If I'm understanding correctly, you're allowing the user to upload a
set of photos and at the same time you're allowing the user to specify
which of those photos should be the default. Could you do something
like this,

<input type="file" name="product[photos_attributes][0][photo]"><input
type="radio" name="product[default_photo]" value="0">
<input type="file" name="product[photos_attributes][1][photo]"><input
type="radio" name="product[default_photo]" value="1">
<input type="file" name="product[photos_attributes][2][photo]"><input
type="radio" name="product[default_photo]" value="2">

In other words, use the "index" as the value of the selected photo.
Another alternative is to use a bit of js along the following lines,

<input type="file" name="product[photos_attributes][0][photo]"><input
type="radio" name="product[photo_attributes][0][default]" value="1"
onclick="uncheck the others">
<input type="file" name="product[photos_attributes][1][photo]"><input
type="radio" name="product[photo_attributes][1][default]" value="1"
onclick="uncheck the others">
<input type="file" name="product[photos_attributes][2][photo]"><input
type="radio" name="product[photo_attributes][2][default]" value="1"
onclick="uncheck the others">



On Oct 10, 5:50 am, johnnybutler7 <[email protected]> wrote:
> Hi,
>
> I have a product that has many photos, so when creating a new product
> the user can upload as many photos as they want.  This all works fine
> using nested attributes for.  I want the user to be able to set one of
> the photos as the default/primary photo, so i have played around with
> using a radio button to decide which photo to select as the default
> but i cant seem to figure out how to save this to the database because
> the records dont exists yet and i have no id field to go on.
>
> Anyone got any solutions or ideas, ive done this before successfully
> but the data has always come from an existing table with data in it.
>
> JB

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