Gretel

config_breadcrumbs.rb

crumb :oya do |oya|                  
  link "Oya", oya_path(oya)          
end                                  
                                     
crumb :kodomo do |kodomo|            
  link "Kodomo", kodomo_path(kodomo) 
  parent :oya, kodomo.oya            
end                                  
                                     
crumb :mago do |mago|                
  link "Mago", mago_path(mago)       
  parent :kodomo, mago.kodomo        
end                                  
                                     
crumb :mago_brother do |mago_brother|            
  link "MagoBrother", mago_brother_path(mago_brother) 
  parent :kodomo, mago_brother.kodomo      
end    

mago.html.haml

- breadcrumb :mago, @mago
= breadcrumbs pretext: "You are here: ", separator: " › "

- breadcrumb :mago_brother, @mago_brother
= breadcrumbs pretext: "You are here: ", separator: " › "