multiple select box Helpers

[alistair_b]

Hi everyone.

Is there an easy helper function to create a multiple select box ie
"<select .... multiple="multiple">...</select>.

Ive looked a the select function but can't see how to do this using it.

What im trying to do is assign a "document" to multiple different clients.

ie client -> has_and_belongs_to :documents and vise versa

[vgarcia]

From http://wiki.rubyonrails.com/rails/pa...mOptionHelpers, but adapted to your situation

<% @selected = @document.clients.collect { |d| d.client_id.to_i } %>
<select name="document[client_ids][]" size="5" multiple="multiple">
  <%= options_from_collection_for_select(@clients, "id", "full_name", @selected) %>
</select>

[alistair_b]

thanks vgarcia that will be a great help.

[Luke Redpath]

I'm actually working on extracting some code from a current project that lets you use two multiple select boxes to assign one object to another object in a many to many relationship, using AJAX. It might also join many to many relationships that use a join model through relationships) - I should hopefully be able to release this as a Rails plugin so stay tuned.