method
extract_values_from_collection

extract_values_from_collection(collection, value_method, selected)
private
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# File actionview/lib/action_view/helpers/form_options_helper.rb, line 748 def extract_values_from_collection(collection, value_method, selected) if selected.is_a?(Proc) collection.map do |element| element.send(value_method) if selected.call(element) end.compact else selected end end