ruby on rails - simple_form turn boolean into dropdown with labels -

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i have boolean column in model. it's called istype1.

now in form, have dropdown 2 values (type1 if boolean true, , type2 if boolean false) instead of checkbox or radio buttons.

is possible?

right displaying radio buttons: 

<%= f.input :istype,  :as => :radio, :label => "type"%>

i prefer if had dropdown user select type1 or type2 without changing model string instead of boolean.

thanks.

this looking for: 

<%= f.input :istype,              :as => :select,              :collection => [['type1',false],['type2',true]],              :include_blank => false,              :label => "type" %>

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