Thanks for the replies. The code, as y'all noted, was incorrect. This
fixed it:
collection_select(:observation,
:observation_category_id,
ObservationCategory.find(:all),
:id,
:name)
I read somewhere that if the :method parameter returns a value in
the :value parameter, that value will default to the selected item in
the list, and this turned out to be true, thus eliminating the need
for :selected.
If I understand your points, the f.collection_select syntax is
preferred over what I have. I'll make that update, and thanks for the
advice.
-Luke
On Apr 7, 11:56 pm, Ram <yourstruly.vi...@gmail.com> wrote:
> 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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