Rails Simple-Form group_method

Question

I came across the following on the simple_form github repo:

f.input :country_id, :collection => @continents, :as => :grouped_select, :group_method =>   :countries

The thing that caught my attention was the :group_method wich would be exceptionally usefull when creating a selectbox that gives options based on what's in the database. The only thing I can't work out is what kind of input the :group_method expects, and where to put the method.

For instance, I want to create a selectbox for the table column :product_type. I imagine I would write something like this in my simple form:

= f.input :product_type_contains, :collection => @products, :as => :grouped_select, :group_method => :product_types

where :product_type would be the method that is being called. But I don't know what kind of method I should write, what kind of result simple_form expects, and if I should put it in the Product class, Product.rb. Any help would be greatly appreciated!

soycamo · Accepted Answer · 2012-09-11 18:33:39Z

According to the test suite, simple_form seems to expect the type of arrays or hashes that you would use with grouped_options_for_select:

test 'grouped collection accepts group_label_method option' do
  with_input_for @user, :tag_ids, :grouped_select,
    :collection => { ['Jose', 'Carlos'] => 'Authors' },
  :group_method => :first,
  :group_label_method => :last
  [...]

test 'grouped collection accepts label and value methods options' do
  with_input_for @user, :tag_ids, :grouped_select,
    :collection => { 'Authors' => ['Jose', 'Carlos'] },
    :group_method => :last,
    :label_method => :upcase,
    :value_method => :downcase
  [...]

Presumably, you could write a class method on Product.rb that creates a structure similar, or even try using grouped_options_for_select(@products)...

Hope this gets you on the right path.

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