Select options for HABTM?

Rails
1

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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2

CSN <cool_screen_name90001@…> writes:

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.

3

— KW [email protected] wrote:

I have a ‘parks’ table and the park model has a
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

<%= options_from_collection_for_select State.find(:all, :order=>'name'), 'id', 'name', @park.states.collect {|state| state.id } %>

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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