Rails - Feb 2006 - select options for HABTM?

I''ve looked through the docs and the wiki and can''t
figure out how to go about generating select options
and the update function for an item that has a HABTM
relationship.

I have a ''parks'' table and the park model has a HABTM
to the ''states'' table. On the park edit page, I''d
like
a multiple select box to appear with all states show,
and those in the parks_states table selected. Does
anybody have some example code?

Thanks!
csn

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CSN <cool_screen_name90001@...> writes:
> I''ve looked through the docs and the wiki and can''t
> figure out how to go about generating select options
> and the update function for an item that has a HABTM
> relationship.
> 
> I have a ''parks'' table and the park model has a HABTM
> to the ''states'' table. On the park edit page,
I''d like
> a multiple select box to appear with all states show,
> and those in the parks_states table selected. Does
> anybody have some example code?
> 
I''d don''t use the multiple-choice select very often, but
something like:

options_from_collection_for_select(State.find(:all), :id, :name, 
  @park.states.collect {|s| s.id})

should work, right? Assuming State is your model, and the value of the option is
State#id, and the text is State#name, and @park is your current Park.
> Thanks!
> csn

--- KW <kianwright@pfima.com> wrote:
> CSN <cool_screen_name90001@...> writes:
> 
> > I''ve looked through the docs and the wiki and
> can''t
> > figure out how to go about generating select
> options
> > and the update function for an item that has a
> HABTM
> > relationship.
> > 
> > I have a ''parks'' table and the park model has a
> HABTM
> > to the ''states'' table. On the park edit page,
I''d
> like
> > a multiple select box to appear with all states
> show,
> > and those in the parks_states table selected. Does
> > anybody have some example code?
> > 
> 
> I''d don''t use the multiple-choice select very often,
> but something like:
> 
> options_from_collection_for_select(State.find(:all),
> :id, :name, 
>   @park.states.collect {|s| s.id})
> 
> should work, right? Assuming State is your model,
> and the value of the option is
> State#id, and the text is State#name, and @park is
> your current Park.
Yeah - here''s what I came up with:

# edit template
<select name="park_states[]" size=10 multiple>
  <%= options_from_collection_for_select
    State.find(:all, :order=>''name''),
''id'', ''name'',
    @park.states.collect {|state| state.id } %>
</select>

# update method
@park = Park.find(params[:id])

@park.state_ids = params[:park_states]

@park.update_attributes(params[:park])

if @park.errors.empty?
  redirect_to :action=>:list
else
  render :action=>:edit
end

If anybody can improve and/or simplify it, please feel
free! Perhaps I''ll stick it in the wiki.

csn


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