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
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.