Re: [Stripes-users] Form to handle many-to-many

[Aaron P. <aa...@mo...>]

I've done it with checkboxes but it was ugly. On the server before
saving I delete everything from the mapping table that relates to the
current object then I add everything that was selected. It would work
better to use a list box (multi-select) because you could use
ServletRequest.getParameterValues() but I'm afraid the HTML part would
still be a hack.

Aaron

Ignacio Coloma wrote:
> In the database, a many-to-many relationship is usually implemented as
> an intermediate table (in your case, a ARTICLE_TO_CATEGORY table).
> Most ORM like Hibernate handle this transparently.
>
> In the interface, that's a good question (people, =BFideas?) I have the
> same problem and was thinking about a list of checkboxes, but that
> would only work for lists of reasonable size.
>
> I am interested in people idea's about an interface to handle a
> many-to-many relationship. Having said that, it seems like your
> concrete needs would better be done with tags (in a similar way as
> google products, del.icio.us, flickr)
>
> Regards,
>
> On 12/22/06, Paul Barry <ma...@pa...> wrote:
>  =20
>> Does anyone have any advice on how to handle a many-to-many with a
>> form?  The specific example I'm working on consists of two objects,
>> Article and Category.  An article can be in many categories and a
>> category can have many articles.  I'm trying to build a form to edit
>> an article.  What I'd like to have is an HTML select with
>> multiple=3Dtrue, but I'm not sure how to go about it.  My action bean
>> has a List<Category> categories property that I'm populating with all
>> of the categories in a pre-action.  My action bean also has an Article
>> property, which is where I'm going to put all the form data.  The
>> article has a Set<Category> categories property that holds all of it's
>> categories.  So I've got 2 questions:
>>
>> 1.  Is there some combination of the stripes select/options tags that
>> I can use to generate a select with multiple=3Dtrue that will properly
>> mark the categories that the article already has as selected?
>>
>> 2.  How should I handle this on the data side?  Will I have to remove
>> all the categories from the article, and then add the ones that get
>> passed from the stripes action?
>>
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