How to use :selected with grouped_collection_select

Question

Is it possible to somehow use the :selected option that you\'d use on a normal select view helper with the grouped_collection_select function? I\'d like to set the value th

Answer 1

I just ran across the same problem and solved it using the option_groups_from_collection_for_select helper and the select helper documented at: http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html.

The first step is to create the grouped options. Taking your example, it should look like:

<% options = option_groups_from_collection_for_select(Trade.order(:name).all,
   :subscription_plans, :name, :id, :display_name, 5) %>

Then I created the select object like:

<%= select('user[subscription_attributes]', :subscription_plan_id, options, 
  include_blank: true) %>

You could write it all out in one line, I just broke out the options into a separate variable to illustrate the two different methods.

Answer 2

Maybe too late, but the API documentation of grouped_collection_select states: 'The value returned from calling method on the instance object will be selected.'

So, you don't even have to specify a :selected option, since Rails will automatically select based on the current value of your attribute. If subscription_plan_id has value 5, then that's what will be selected.

If that's supposed to be a default value, then you can set it with an after_initialize in your model.

Answer 3

Actually you need to send in options include_blank for example

<%= grouped_collection_select :id, model.all, options = {:include_blank => 'Selecione'}%>