On Jan 23, 2011, at 1:12 PM, Peter Booth wrote:
> I'm wondering if anyone can help with the following?
>
> I am trying to build a form that will allow a user to view a grid of scraped
> image thumbnails,
> and delete a subset of these.
>
> I am stuck trying to understand how to wire the form. I'm wondering if there
> is an example that
> shows how to select a subset of has_many associations to delete?
>
> My app has two models: ScrapeJob and Scrape
>
>
> ScrapeJob represents an entire page
>
> Scrape holds a single image (using paperclip)
>
> has_attached_file :photo,
> :styles => {
> :thumb=> "100x100#",
> :small => "400x400>" }
>
> ScrapeJob has_many :scrapes
>
> When a ScrapeJob is created it uses a callback to scrape the chosen page
> after the model object is written to the DB
>
> after_save :start_scraping
>
> I have extended the Card for Scrape so that the ScrapeJob show page shows the
> images
>
> <extend tag="card" for="Scrape" >
> <old-card merge>
> <heading: param>
> <img src="#{this.photo(:thumb)}" />
> </heading:>
> </old-card>
> </extend>
>
>
> My challenge is making the edit page work.
>
> I understand that <select-many> and <check-many> work with existing objects,
> whilst the tag <input-many> is intended for new objects.
>
>
> When my edit page looks like this
>
> <def tag="edit-page-new">
> <edit-page merge>
> <content-body:>
> < select-many:scrapes><img src="#{this.photo(:thumb)}" />
> </select-many>
> </content-body:>
> </edit-page>
> </def>
> <edit-page-new/>
The form here has vanished because you asked it to. :)
The content-body param here blows away *everything* inside it, including the
form tag. Doing this:
<edit-page merge>
<form:>
<field-list: replace>
...content here...
</field-list:>
</form:>
</edit-page>
will leave the form tag alone, along with the submit button and the
error-messages bit.
--Matt Jones
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