Module: Xylem::ClassMethods

Defined in:
lib/xylem.rb

Instance Method Summary collapse

Instance Method Details

#leaves ⇒ Object 



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# File 'lib/xylem.rb', line 66

def leaves
  t = arel_table
  where(t[:id].not_in(t.project([t[:parent_id]]).where(t[:parent_id].not_eq(nil)).distinct))
end

#root ⇒ Object 



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# File 'lib/xylem.rb', line 58

def root
  roots.first
end

#roots ⇒ Object 



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# File 'lib/xylem.rb', line 62

def roots
  where(parent: nil)
end