formtastic_tristate_radio 0.2.1
Have 3-state radiobuttons instead of a 2-state checkbox for your Boolean columns which can store NULL. Does not change controls, you need to turn it on via `as: :tristate_radio` option.
          Gemfile:
          =
        
        
          instalar:
          =
        
      Runtime Dependencies (2):
            formtastic
            >= 3, < 5
          
          
            rails
            >= 4, < 7
          
    Development Dependencies (1):
            yard
            >= 0.9, < 1
          
    