Module: Xylem::InstanceMethods

Instance Method Summary collapse



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# File 'lib/xylem.rb', line 5

def ancestors
  _xylem_query(:id, parent_id, :id, :parent_id, :desc)
end



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# File 'lib/xylem.rb', line 13

def descendants
  _xylem_query(:parent_id, id, :parent_id, :id, :asc)
end

Returns:



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# File 'lib/xylem.rb', line 41

def leaf?
  children.size == 0
end



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# File 'lib/xylem.rb', line 45

def leaves
  descendants.leaves
end



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# File 'lib/xylem.rb', line 21

def root
  ancestors.first
end

Returns:



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# File 'lib/xylem.rb', line 37

def root?
  parent.nil?
end



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# File 'lib/xylem.rb', line 9

def self_and_ancestors
  _xylem_query(:id, id, :id, :parent_id, :desc)
end



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# File 'lib/xylem.rb', line 33

def self_and_children
  [self] + children
end



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# File 'lib/xylem.rb', line 17

def self_and_descendants
  _xylem_query(:id, id, :parent_id, :id, :asc)
end



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# File 'lib/xylem.rb', line 29

def self_and_siblings
  self.class.where(parent_id: parent_id)
end



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# File 'lib/xylem.rb', line 25

def siblings
  self.class.where(parent_id: parent_id).where.not(id: id)
end