Module: DataMapper::Is::NestedSet::InstanceMethods

Public Visibility

Public Instance Method Summary

#move(vector)

move self / node to a position in the set.

Returns:

#move_without_saving(vector)

does all the actual movement in #move, but does not save afterwards.

#reload_position

reloads the left and right attributes for self.

Public Instance Method Details

move

public move(vector)

move self / node to a position in the set. position can only be changed through this

Meta Tags

Parameters:

vector

<Symbol, Hash> A symbol, or a key-value pair that describes the requested movement

Returns:

<FalseClass> returns false if it cannot move to the position, or if it is already there

Raises:

<RecursiveNestingError>

if node is asked to position itself into one of its descendants

<UnableToPositionError>

if node is unable to calculate a new position for the element

See Also:

move_without_saving
[View source] 


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# File 'dm-more/dm-is-nested_set/lib/dm-is-nested_set/is/nested_set.rb', line 141

def move(vector)
  move_without_saving(vector)
  save
end

move_without_saving

public move_without_saving(vector)

does all the actual movement in #move, but does not save afterwards. this is used internally in before :save, and will probably be marked private. should not be used by organic beings.

Meta Tags

See Also:

move_without_saving
[View source] 


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# File 'dm-more/dm-is-nested_set/lib/dm-is-nested_set/is/nested_set.rb', line 151

def move_without_saving(vector)
if vector.is_a? Hash then action,object = vector.keys[0],vector.values[0] else action = vector end

reload_position

public reload_position

reloads the left and right attributes for self. if #move did not use this, we’d get quite peculiar results, and most likely corrupt the nested sets pretty fast.

[View source] 


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# File 'dm-more/dm-is-nested_set/lib/dm-is-nested_set/is/nested_set.rb', line 111

def reload_position




  self.reload_attributes(:lft,:rgt)
end