I think I've found an optimal solution for this.
Since the validators for my table are only enforced at the form-level, I
first insert a blank playlists record, and then use a SQLFORM or CRUD to
update the newly inserted record. I can't submit an incomplete form, but I
can insert an incomplete record and mark the "finished" column as false.
This way, the playlist id already exists and I can save the playlist_tracks
to the reference table. The validators will still apply when the user
submits the form.
On Saturday, November 23, 2013 6:50:19 PM UTC-8, Mark Li wrote:
>
>
> I currently have 2 tables as follows, with a form containing values both
> tables
>
> db.define_table('playlist',
> Field('title', notnull=True),
> Field('description'),
> Field('tags'),
> Field('genre', 'reference genre')
> Field('finished', 'boolean')
> )
>
> db.define_table('playlist_tracks',
> Field('playlist', 'reference playlist'),
> Field('songname')
> )
>
>
>
> The form to add playlist_tracks is dynamic; a user enters a songname,
> which appends an input element with value=songname. When the user submits
> the form, if the form does not pass validation, then the playlist_tracks
> will all disappear when the page reloads, since they were added dynamically.
>
> I want to prevent this from happening, as it can be very time consuming to
> add all the playlist tracks. I want to save the playlist_tracks in the
> reference table so they don't disappear, but it's not possible because
> there is no 'playlist' reference (the playlist didn't pass validation). I
> also want to give the user the option of "saving" an incomplete form to
> work on later, which has the same problem because the incomplete form might
> not pass validation, and thus there is no 'playlist' reference.
>
> What would be the best method of saving this incomplete form, so the
> dynamically added playlist tracks will have a playlist reference?
>
> I was thinking about inserting the record with dummy default values, after
> validation fails, but that has the disadvantage of automatically filling a
> required field that the user didn't choose. For example, if a user doesn't
> enter a title and doesn't select a genre from the select drop-down, then
> after validation fails, I'll insert the record with "Untitled Playlist" and
> genre==1 (and all other fields that passed validation would remain
> unchanged) but still show the form errors.
>
>
>
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