Module: CollectiveIdea::Acts::NestedSet::Model::ClassMethods

Defined in:
lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb

Instance Method Summary (collapse)

Instance Method Details

- (Object) associate_parents(objects) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 27

def associate_parents(objects)
  return objects unless objects.all? {|o| o.respond_to?(:association)}

  id_indexed = objects.index_by(&:id)
  objects.each do |object|
    association = object.association(:parent)
    parent = id_indexed[object.parent_id]

    if !association.loaded? && parent
      association.target = parent
      association.set_inverse_instance(parent)
    end
  end
end

- (Object) children_of(parent_id) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 42

def children_of(parent_id)
  where arel_table[parent_column_name].eq(parent_id)
end

- (Object) each_with_level(objects, &block)

Iterates over tree elements and determines the current level in the tree. Only accepts default ordering, odering by an other column than lft does not work. This method is much more efficent than calling level because it doesn't require any additional database queries.

Example:

Category.each_with_level(Category.root.self_and_descendants) do |o, level|



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 54

def each_with_level(objects, &block)
  Iterator.new(objects).each_with_level(&block)
end

- (Object) leaves 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 58

def leaves
  nested_set_scope.where "#{quoted_right_column_full_name} - #{quoted_left_column_full_name} = 1"
end

- (Object) left_of(node) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 62

def left_of(node)
  where arel_table[left_column_name].lt(node)
end

- (Object) left_of_right_side(node) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 66

def left_of_right_side(node)
  where arel_table[right_column_name].lteq(node)
end

- (Object) nested_set_scope(options = {}) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 74

def nested_set_scope(options = {})
  options = {:order => quoted_order_column_full_name}.merge(options)

  order(options.delete(:order)).scoped options
end

- (Object) primary_key_scope(id) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 80

def primary_key_scope(id)
  where arel_table[primary_key].eq(id)
end

- (Object) right_of(node) 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 70

def right_of(node)
  where arel_table[left_column_name].gteq(node)
end

- (Object) root 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 84

def root
  roots.first
end

- (Object) roots 



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# File 'lib/plugins/awesome_nested_set/lib/awesome_nested_set/model.rb', line 88

def roots
  nested_set_scope.children_of nil
end