Module: DataMapper::Is::NestedSet::ClassMethods

Defined in:
lib/dm-is-nested_set/is/nested_set.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#nested_set_parent ⇒ Object (readonly)

Returns the value of attribute nested_set_parent.



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 60

def nested_set_parent
  @nested_set_parent
end

#nested_set_scope ⇒ Object (readonly)

Returns the value of attribute nested_set_scope.



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 60

def nested_set_scope
  @nested_set_scope
end

Instance Method Details

#adjust_gap!(scoped_set, at, adjustment) ⇒ Object 



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 62

def adjust_gap!(scoped_set,at,adjustment)
  scoped_set.all(:rgt.gt => at).adjust!({ :rgt => adjustment }, true)
  scoped_set.all(:lft.gt => at).adjust!({ :lft => adjustment }, true)
end

#leaves ⇒ Object 



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 90

def leaves
  # TODO scoping, how should it act?
  # TODO supply filtering-option?
  all(:conditions => [ 'rgt = lft + ?', 1 ], :order => [ :lft ])
end

#rebuild_set_from_tree(order = nil) ⇒ Object

rebuilds the nested set using parent/child relationships and a chosen order



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 109

def rebuild_set_from_tree(order = nil)
  # TODO pending
end

#rebuild_tree_from_set ⇒ Object

rebuilds the parent/child relationships (parent_id) from nested set (left/right values)



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 99

def rebuild_tree_from_set
  all.each do |node|
    node.parent = node.ancestor
    node.save
  end
end

#root ⇒ Object

get the root of the tree. if sets are scoped, this will return false



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 70

def root
  # TODO scoping
  # what should this return if there is a scope? always false, or node if there is only one?
  args = Hash[ nested_set_parent.zip([]) ]
  roots.length > 1 ? false : first(args)
end

#roots ⇒ Object

not implemented



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# File 'lib/dm-is-nested_set/is/nested_set.rb', line 80

def roots
  # TODO scoping
  # TODO supply filtering-option?
  args = Hash[ nested_set_parent.zip([]) ]
  all(args)
end