Rails - Apr 2008 - option_groups_from_collection_for_select with a ActiveRecord::Base single object

Rails documentation gives examples of using
option_groups_from_collection_for_select with two tables/objects.

How could it be done with one?


Example that almost works:

I have a form to enter address from both the United States and Canada.
It has the following:

====new.html.erb===<%= select_tag(
  :state,
  option_groups_from_collection_for_select(
    State.countries,
    :country,
    :country,
    "id",
    "id")) %>
================
I have a migration with all the states/provinces I need.

==== 001_create_states.rb===class CreateStates < ActiveRecord::Migration
  def self.up
    create_table :states do |t|
      t.string :name
      t.string :postal
      t.string :country
      t.timestamps
    end
    State.create :name => ''Alabama'', :postal =>
''AL'', :country =>
''United States''
    State.create :name => ''Alaska'', :postal =>
''AK'', :country =>
''United States''
    State.create :name => ''Saskatchewan'', :postal =>
''SK'', :country =>
''Canada''
    State.create :name => ''Yukon'', :postal =>
''YT'', :country =>
''Canada''
  end

  def self.down
    drop_table :states
  end
end
================
I also have a little bit defined in the model.

====state.rb===class State < ActiveRecord::Base
  def self.countries
    State.find(:all, :select => "country", :group =>
"country")
  end
end
================

The optgroups are correctly made. However, I can''t find a combination
that will give me any actual state names in those lists (with this, I
get a single option with a number of unknown origin).

Documentation seems to say that "self.countries" should have ...
functions ... associated with  .. the returned collection?

Guidance please?

-Sud.
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Just use options_from_collection_for_select

Julian.


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On 11/04/2008, at 6:32 AM, Sudrien wrote:
>
> Rails documentation gives examples of using
> option_groups_from_collection_for_select with two tables/objects.
>
> How could it be done with one?
>
>
> Example that almost works:
>
> I have a form to enter address from both the United States and Canada.
> It has the following:
>
> ====new.html.erb===> <%= select_tag(
>  :state,
>  option_groups_from_collection_for_select(
>    State.countries,
>    :country,
>    :country,
>    "id",
>    "id")) %>
> ================>
> I have a migration with all the states/provinces I need.
>
> ==== 001_create_states.rb===> class CreateStates <
ActiveRecord::Migration
>  def self.up
>    create_table :states do |t|
>      t.string :name
>      t.string :postal
>      t.string :country
>      t.timestamps
>    end
>    State.create :name => ''Alabama'', :postal =>
''AL'', :country =>
> ''United States''
>    State.create :name => ''Alaska'', :postal =>
''AK'', :country =>
> ''United States''
>    State.create :name => ''Saskatchewan'', :postal =>
''SK'', :country =>
> ''Canada''
>    State.create :name => ''Yukon'', :postal =>
''YT'', :country =>
> ''Canada''
>  end
>
>  def self.down
>    drop_table :states
>  end
> end
> ================>
> I also have a little bit defined in the model.
>
> ====state.rb===> class State < ActiveRecord::Base
>  def self.countries
>    State.find(:all, :select => "country", :group =>
"country")
>  end
> end
> ================>
>
> The optgroups are correctly made. However, I can''t find a
combination
> that will give me any actual state names in those lists (with this, I
> get a single option with a number of unknown origin).
>
> Documentation seems to say that "self.countries" should have ...
> functions ... associated with  .. the returned collection?
>
> Guidance please?
>
> -Sud.
> >





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Ok, that and some reading has gotten me to this:

====app/views/wherever/new.html.erb===<%= render(:partial =>
"states/state") %>
================
====app/views/states/_state.html.erb===<%= select_tag( :state,
options_from_collection_for_select (
    State.states,
    :postal,
    :name
	  )) %>
================
====app/models/state.rb===class State < ActiveRecord::Base
  def self.countries
    State.find(:all, :select => "country", :group =>
"country")
  end
  def self.states
    find(:all)
  end
end
================
...It does show all the states, but I really want them in optgroups by
country. Obviously my "State.countries" isn''t currently
enough to do
that.

-Sud.




On Apr 10, 10:21 pm, Julian Leviston
<jul...-AfxEtdRqmE/tt0EhB6fy4g@public.gmane.org>
wrote:
> Just use options_from_collection_for_select
>
> Julian.
>


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The only example that I''ve seen of this is in AWD Ch. 22 (p. 488
printed), and it seems to be a lot of work.  The book wraps the
option_groups_from_collection_for_select in <select> tags (html, not a
helper).  The first parameter given is the highest level array - in
your case, it would essentially be [ "Canada", "US" ] - but
each value
in the array is another object (a class in the example) with the group
name and sub-options available through attr_reader methods.

It seems like a lot of work.  If you want to do it the "good" way,
read more of the API on option_groups_from_collection_for_select (I
think that you were on the right track for what you want to do).
Since you only have two groups, you could also do a little hard-coding
and use helpers to get the states.

-Kyle

On Apr 11, 9:42 am, Sudrien
<sudr...-5+SPVq0q6MJWk0Htik3J/w@public.gmane.org>
wrote:
> Ok, that and some reading has gotten me to this:
>
> ====app/views/wherever/new.html.erb===> <%= render(:partial =>
"states/state") %>
> ================>
> ====app/views/states/_state.html.erb===> <%= select_tag( :state,
options_from_collection_for_select (
>     State.states,
>     :postal,
>     :name
>           )) %>
> ================>
> ====app/models/state.rb===> class State < ActiveRecord::Base
>   def self.countries
>     State.find(:all, :select => "country", :group =>
"country")
>   end
>   def self.states
>     find(:all)
>   end
> end
> ================>
> ...It does show all the states, but I really want them in optgroups by
> country. Obviously my "State.countries" isn''t currently
enough to do
> that.
>
> -Sud.
>
> On Apr 10, 10:21 pm, Julian Leviston
<jul...-AfxEtdRqmE/tt0EhB6fy4g@public.gmane.org> wrote:
>
> > Just use options_from_collection_for_select
>
> > Julian.
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