How can I create select with grouped options with simple_form from table, not from collection ? Tried:
= f.input :countries,
:collection => [["North America",[["United States","US"],["Canada","CA"]]]],
:as => :grouped_select
but got error: nil is not a symbol
A quick look at the documentation on https://github.com/plataformatec/simple_form shows that you need a :group_method => :method on the collection_select.
Here's the complete example they give: f.input :country_id, :collection => @continents, :as => :grouped_select, :group_method => :countries
Also, just in case you didn't know, simple_form has a country_select helper and you need to add gem 'country_select' to your gemfile if you plan on using it.
A country_select using that helper might look like this:
f.input :shipping_country, :priority => [ "Brazil" ] with an option to restrict the list to just a few countries like so: f.input :shipping_country, :priority => [ "Brazil" ], :collection => [ "Australia", "Brazil", "New Zealand"] Those examples were found in the simple_form docs in the "priority" section: http://rubydoc.info/github/plataformatec/simple_form/master/frames. Apparently, simple_form will detect it's for a country, so just using input should suffice.
In my case, only worked when I used as: :grouped_select and :group_method => :last
