ive come across this problem and as far as my searching took me,
collection_select does not support the :selected option.
you can handle this by initializing the "selected" value in the
controller for the appropriate attribute before rendering the partial.
The code you have shown above is slightly flawed in the syntax of
collection_select as Fred has already pointed out. I think you want
<%= f.collection_select :observation_category_id,
ObservationCategory.find(:all), :id, :name %>
So in your case, the problem really was the syntax. The above should
work for your edit form ie. the correct option will be selected based
on the existing value (built into collection_select).
The lack of support for the :selected option in collection_select
however, is a side issue. Anyone know if there's a fix for it? Besides
initializing the value for it in the controller before rendering the
partial?
On Apr 7, 12:43 pm, Frederick Cheung <frederick.che...@gmail.com>
wrote:
> On Apr 7, 5:21 am, LukeG <lgill...@gmail.com> wrote:
>
> > I'm a noob. I've trolled the web and groups for help, but I just don't
> > know enough Rails to apply the solutions to my particular problem. I
> > even got the screencast from Pragmatic Programmers, but still no dice.
>
> > I'm having a problem getting my collection_select to initialize with a
> > previously stored value. I have items and categories, with many items
> > to one category. When I edit an item, the category list populates
> > correctly, but I cannot figure out how to set the default to whatever
> > category was already stored for that item.
>
> collection_select is like the various model helpers in that you do
> collection_select 'instance_variable_name', 'method_name', ...
> ie in this instance collection_select 'observation',
> 'category_id', ...
>
> Seeing as how you've already got a form_for setup, you should be able
> to do f.collection_select 'category_id', ...
> Calling it on the form builder means you don't need to tell rails
> which object you are working with.
>
> Fred
>
>
>
> > Running Rails 2.3.2, here is the code:
>
> > *controller:*
> > def edit
> > @observation = Observation.find(params[:id])
> > end
>
> > *view:*
> > <%= f.label "Category" %><br />
> > <%=
> > collection_select(:observation_category_id,
> > @category_id,
> >
> > ObservationCategory.find(:all),
> > :id,
> > :name,
> > {:selected =>
> > @observation.observation_category_id})
> > %>
>
> > *models:*
> > class Observation < ActiveRecord::Base
> > attr_accessible :name, :icon_url, :observation_catategory_id
> > belongs_to :observation_category
> > end
>
> > class ObservationCategory < ActiveRecord::Base
> > has_many :observations
> > end
>
> > *html:*
> > <label for="observation_Category">Category</label><br />
> > <select id="observation_category_id_" name="observation_category_id
> > []"><option value="1">exercise</option>
> > <option value="2">finance</option>
> > <option value="3">nutrition</option>
> > <option value="4">mood</option>
> > <option value="5">energy</option>
>
> > <option value="6">focus</option>
> > <option value="7">sleep</option>
> > <option value="8">junk_cat</option>
> > <option value="9">satiation</option></select>
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